TWI877068B - Cultivation method of low-protein rice - Google Patents

Abstract

The present disclosure provides a cultivation method of low-protein rice including the following steps. A land preparation step is performed, wherein a first fertilizer composition is applied to a cultivated land. A transplanting step is performed, wherein a rice seedling is planted in the cultivated land. A first cultivation step is performed, wherein the rice seedling is cultured in the cultivated land with a second fertilizer composition for fifteen to thirty days so as to obtain an adult rice plant. A second cultivation step is performed, wherein the adult rice plant is cultured in the cultivated land with a third fertilizer composition for fifteen to thirty days. A harvesting step is performed so as to obtain a plurality of low-protein rice. Therefore, the cultivation method of low-protein rice of the present disclosure can provide a healthier dietary choice for patients with chronic kidney disease and has good market potential.

Description

Cultivation method of low-protein rice

The present invention relates to a method for cultivating rice, in particular to a method for cultivating low-protein rice.

For patients with chronic kidney disease, their kidneys cannot effectively excrete nitrogenous waste products produced after protein metabolism, causing nitrogenous waste products to accumulate in the blood and become toxic to the body. Therefore, appropriately limiting protein intake can slow down the deterioration of kidney function.

In order to reduce the harm caused by nitrogenous waste to the body, doctors and other professionals often recommend limiting the protein intake in the meals of patients with chronic kidney disease and replacing them with other types of food to supplement the insufficient calories. Since rice is the staple food of Oriental people, but the bioavailability of protein in rice is not high, when protein intake is limited, patients with chronic kidney disease should choose high-quality protein as the main choice, such as chicken, fish and soy products, to increase protein absorption. Alternatively, low-protein starch (rice noodles, vermicelli, rice noodles, etc.) can be used to replace part of the staple food, which can maintain calorie balance and avoid excessive protein intake. Therefore, consuming too much protein from rice is not conducive to the dietary control of patients with chronic kidney disease.

In order to solve the above problems, some businesses have processed the rice currently on the market by drying, steaming, etc. to decompose the protein in it, or fermented the rice by adding microorganisms to obtain rice with a lower protein content. However, processing rice by drying, steaming, etc. will not only destroy other nutrients in the rice, but the processing method is also more complicated, and the heat treatment process may also cause other bacteria to grow, which is not ideal in terms of nutrition and hygiene considerations. Furthermore, the method of reducing the protein content in rice by microbial fermentation may also change the composition ratio of other nutrients, and there is also concern that the microorganisms themselves or their secondary metabolites may cause gastrointestinal discomfort, allergies and other reactions, resulting in many limitations in the industrial application of the method of reducing the protein content in rice by post-processing in the above manner.

Therefore, developing a rice with low protein content that can be cultivated to meet market demand is a technical issue with economic value.

An embodiment of the present invention provides a method for cultivating low-protein rice, comprising the following steps: performing a land preparation step, which is to apply a first fertilizer composition to a cultivated land, wherein the first fertilizer composition comprises phosphoric acid, nitrogen and potassium, and the phosphoric acid is 1 weight percent, the nitrogen is 2.5-4.5 weight percent, and the potassium is 1.5-3 weight percent. Performing a rice transplanting step, which is to plant a rice seedling in the cultivated land. A first cultivation step is performed, wherein the rice seedlings are cultivated in a cultivated land for 15 to 30 days and a second fertilizer composition is applied to obtain a mature rice plant, wherein the second fertilizer composition is applied at least once in the first cultivation step, and the second fertilizer composition comprises magnesium, manganese, iron, boron, zinc and copper, and based on 1 weight percent of copper, 6 to 18 weight percent of magnesium, 2 to 6 weight percent of manganese, 1.5 to 6 weight percent of iron, 1 to 3 weight percent of boron and 2 to 5 weight percent of zinc. A second cultivation step is performed, wherein the mature rice plants are cultivated in cultivated land for 15 to 30 days and a third fertilizer composition is applied to the mature rice plants so that the mature rice plants enter a reproductive period, and the third fertilizer composition is applied at least once in the second cultivation step, wherein the third fertilizer composition comprises magnesium, manganese, iron, boron, zinc, copper, phosphoric acid, nitrogen and potassium, and based on 1 weight percent of copper, 6 to 18 weight percent of magnesium, 2 to 6 weight percent of manganese, and 1.5 to 6 weight percent of iron. , boron is 1-3 weight percent, zinc is 2-5 weight percent; and the weight percent of phosphoric acid in the third fertilizer composition is 1/20-1/50 of the weight percent of phosphoric acid in the first fertilizer composition, the weight percent of nitrogen in the third fertilizer composition is 1/20-1/50 of the weight percent of nitrogen in the first fertilizer composition, and the weight percent of potassium in the third fertilizer composition is 1/20-1/50 of the weight percent of potassium in the first fertilizer composition. A harvesting step is performed, which is to harvest the rice plants to obtain a plurality of low-protein rices, wherein the protein content of the low-protein rice is less than 6 grams of protein per 100 grams of low-protein rice.

According to the aforementioned method of cultivating low-protein rice, the organic matter content of the cultivated land can be 0.5%~3.5%.

According to the aforementioned method for cultivating low-protein rice, a pH value of the cultivated land may be 5.5-7.5.

According to the aforementioned method for cultivating low-protein rice, the rice plant can be a first-stage rice plant or a second-stage rice plant.

According to the aforementioned method for cultivating low-protein rice, when the rice plants are first-stage rice plants, the first cultivation step may be to cultivate the rice plants in cultivated land for 20 to 30 days.

According to the aforementioned method for cultivating low-protein rice, when the rice seedlings are the first-stage rice plants, the second cultivation step may be to cultivate the mature rice plants in the cultivated land for 15 to 25 days.

According to the aforementioned method for cultivating low-protein rice, when the rice plants are second-stage rice plants, the first cultivation step may be to cultivate the rice plants in cultivated land for 15 to 25 days.

According to the aforementioned method for cultivating low-protein rice, when the rice seedlings are second-stage rice, the second cultivation step is to cultivate the rice mature plants in cultivated land for 15 to 25 days.

According to the aforementioned method for cultivating low-protein rice, the second fertilizer composition can be applied to young rice plants in the form of foliar fertilization.

According to the aforementioned method for cultivating low-protein rice, the third fertilizer composition can be applied to mature rice plants in the form of foliar fertilization.

Thus, the cultivation method of low-protein rice of the present invention applies a first fertilizer composition having a specific ratio of phosphate, nitrogen and potassium to the cultivated land before the rice seedling transplanting step, and sequentially provides a second fertilizer composition and a third fertilizer composition after the rice seedlings are planted in the cultivated land. The three-stage nutritional difference cultivation method not only enables the rice seedlings to grow healthily, but also the cultivated low-protein rice has a lower protein content and can be applied to the dietary control plan of patients with chronic kidney disease, making it have excellent market application potential.

The following will illustrate specific experimental examples of the present invention with reference to the drawings, so that those with ordinary knowledge in the field to which the present invention belongs can fully utilize and practice the present invention without excessive interpretation and experimentation. However, the reader should understand that these practical details should not be used to limit the present invention, that is, in some experimental examples of the present invention, these practical details are not necessary, but are used to illustrate how to implement the materials and methods of the present invention.

[The cultivation method of low-protein rice of the present invention]

Please refer to FIG. 1 , which is a flow chart showing the steps of the cultivation method 100 of low-protein rice of the present invention. The cultivation method 100 of low-protein rice comprises step 110 , step 120 , step 130 , step 140 and step 150 .

Step 110 is a land preparation step, which is to apply a first fertilizer composition to a cultivated land. In detail, before rice is planted, the cultivated land will be plowed and sun-dried after the previous crop is harvested to promote soil weathering, organic matter decomposition and toxic substance release, and then irrigation water is introduced into the cultivated land and maintained for 2 to 4 days, and the first fertilizer composition is applied to the soil of the cultivated land 3 days before transplanting rice to facilitate subsequent cultivation.

In the low-protein rice cultivation method 100 of the present invention, the first fertilizer composition is applied to the soil of the cultivated land as a base fertilizer, and the first fertilizer composition includes phosphoric acid, nitrogen and potassium, wherein the phosphoric acid is 1 weight percent, the nitrogen is 2.5-4.5 weight percent, and the potassium is 1.5-3 weight percent. Furthermore, the organic matter content of the cultivated land can be 0.5%-3.5%, and the pH value of the cultivated land can be 5.5-7.5, so as to provide a good growth environment for the rice seedlings, but the present invention is not limited thereto.

Step 120 is to perform a rice transplanting step, which is to plant a rice plantlet in the cultivated land. The rice plantlet can be a rice of different varieties currently available on the market or in seedling cultivation, and in the rice transplanting step, the rice plantlet will be planted in the cultivated land with a water depth of about 3 cm to promote the survival of the rice plantlet and the growth of branches from the lateral buds at the base node near the ground, so that the rice plantlet enters the tillering stage.

Furthermore, the rice plantlet may be a first-crop rice plant or a second-crop rice plant. Specifically, the current rice cultivation may be a two-crop rice plant, which is a cultivation system in which crops are planted twice a year on the same cultivated land, wherein the first-crop rice plant refers to rice cultivated from February to June, and the second-crop rice plant refers to rice cultivated from July to October. When the rice plantlet is a first-crop rice plantlet, the rice plantlet may be a plantlet 18 to 20 days after rice sowing and having a seedling age of 2.5 to 3.0 leaves, and when the rice plantlet is a second-crop rice plantlet, the rice plantlet may be a plantlet 10 to 12 days after rice sowing and having a seedling age of 2.5 to 3.0 leaves, but the present invention is not limited thereto.

Step 130 is to perform a first cultivation step, which is to cultivate the rice plantlets in the cultivated land for 15 to 30 days and apply a second fertilizer composition to obtain a mature rice plant. In the first cultivation step, the rice plantlets grow in the cultivated land with a water depth of about 3 to 5 centimeters to promote the root development and early tillering of the rice plantlets, and the second fertilizer composition is applied at least once in the first cultivation step. In other words, the second fertilizer composition is applied at least once in 15 to 30 days of the first cultivation step. Furthermore, the second fertilizer composition can be applied to the rice plantlets in the form of foliar fertilization to improve the utilization efficiency of the second fertilizer composition by the rice plantlets, thereby causing the rice plantlets to have a series of tillers and then grow into mature rice plants. More specifically, the first cultivation step is to apply the second fertilizer composition to the rice plantlets at the early tillering stage when a leaf collar appears on the fifth leaf on the main stem, and the rice plantlets will absorb nutrients from the second fertilizer composition and continue to tiller and grow into mature rice plants.

In the cultivation method 100 of low-protein rice of the present invention, the second fertilizer composition comprises magnesium, manganese, iron, boron, zinc and copper, and based on 1 weight percent of copper, 6-18 weight percent of magnesium, 2-6 weight percent of manganese, 1.5-6 weight percent of iron, 1-3 weight percent of boron and 2-5 weight percent of zinc, the components of the second fertilizer composition are not selected from the main nutrients such as nitrogen, phosphate and potassium, but are composed of trace elements such as magnesium, manganese, iron, boron, zinc and copper, so that the rice plantlets can effectively utilize the nutrients in the first fertilizer composition applied in the early stage.

Furthermore, when the rice plants are first-stage rice plants, the first cultivation step is to cultivate the rice plants in the cultivated land for 20 to 30 days, and when the rice plants are second-stage rice plants, the first cultivation step is to cultivate the rice plants in the cultivated land for 15 to 25 days, but the present invention is not limited thereto.

In addition, depending on the type of cultivated land or the climate difference in the planting area, the first cultivation step may also include a field sunning period. The field sunning period is to remove the irrigation water in the cultivated land to make the soil dry and slightly cracked. At this time, the roots of the young rice plants will be able to obtain more sufficient oxygen, which will promote the downward growth of the rice roots. This will be beneficial for absorbing nutrients in the later stage of cultivation and prevent lodging. At the same time, it can also inhibit ineffective tillering, thereby promoting the improvement of rice yield and quality, but the present invention is not limited to this.

Step 140 is to perform a second cultivation step, which is to cultivate the rice plants in the cultivated land for 15 to 30 days and apply a third fertilizer composition to make the rice plants head and mature, and the third fertilizer composition is applied at least once in the second cultivation step. In detail, the rice plants will begin to enter the breeding period in the second cultivation step, during which the water depth of the cultivated land is about 5 to 10 centimeters, and the area of the rice leaves is the maximum in the whole growth period, so that the rice grains are nourished through vigorous photosynthesis, and the third fertilizer composition is applied at least once in the 15 to 30 days of the second cultivation step, so that the rice plants enter the breeding period. More specifically, the second cultivation step is to apply the third fertilizer composition after the rice plant has a leaf collar on the ninth leaf on the main stem and before the tenth leaf has a leaf collar, at which time the rice plant will begin to develop panicles and enter the reproductive period. When the panicle appears on the tenth leaf, the panicles of the rice plant will begin to differentiate.

Specifically, in the cultivation method 100 of low-protein rice of the present invention, the third fertilizer composition comprises magnesium, manganese, iron, boron, zinc, copper, phosphoric acid, nitrogen and potassium, wherein based on 1 weight percent of copper, 6-18 weight percent of magnesium, 2-6 weight percent of manganese, 1.5-6 weight percent of iron, 1-3 weight percent of boron, and 2-5 weight percent of zinc. In addition, the weight percent of phosphoric acid in the third fertilizer composition is 1/20-1/50 of the weight percent of phosphoric acid in the first fertilizer composition, the weight percent of nitrogen in the third fertilizer composition is 1/20-1/50 of the weight percent of nitrogen in the first fertilizer composition, and the weight percent of potassium in the third fertilizer composition is 1/20-1/50 of the weight percent of potassium in the first fertilizer composition. In addition, the third fertilizer composition can be applied to the mature rice plants in the form of foliar fertilization to improve the utilization efficiency of the third fertilizer composition by the mature rice plants.

Furthermore, when the rice seedlings are first-stage rice, the second cultivation step is to cultivate the mature rice plants in the cultivated land for 15 to 25 days, and when the rice seedlings are second-stage rice, the second cultivation step is to cultivate the mature rice plants in the cultivated land for 15 to 25 days, but the present invention is not limited thereto.

Step 150 is to perform a harvesting step, which is to harvest the rice plants to obtain a plurality of low-protein rices, wherein the protein content of the low-protein rice is less than 6 grams of protein per 100 grams of the low-protein rice.

Thus, the cultivation method 100 of low-protein rice of the present invention uses a three-stage nutritional difference cultivation method of applying a first fertilizer composition having a specific ratio of phosphate, nitrogen and potassium as a base fertilizer to the cultivated land before the rice transplanting step, and sequentially providing a second fertilizer composition and a third fertilizer composition after the rice seedlings are planted in the cultivated land, so that the cultivated low-protein rice has a lower protein content, and each 100 grams of low-protein rice contains less than 6 grams of protein. Therefore, the low-protein rice cultivated by the cultivation method 100 of low-protein rice of the present invention can be applied to the diet control plan of patients with chronic kidney disease, and has excellent market application potential.

[Examples and Comparative Examples]

In this experiment, rice seedlings from Tainan No. 16 were cultivated according to the cultivation method of low-protein rice of the present invention to obtain the low-protein rice of Example 1, and the nutritional composition of the low-protein rice of Example 1 was further analyzed to illustrate the protein content of the low-protein rice obtained by cultivating the low-protein rice cultivation method 100 of the present invention. For the detailed steps and details of the cultivation method of low-protein rice of the present invention, please refer to the description of the cultivation method 100 of low-protein rice, which will not be repeated here.

In this experiment, the first fertilizer composition of the present invention is applied to the soil of the cultivated land before transplanting, and the second fertilizer composition of the present invention and the third fertilizer composition of the present invention are applied in sequence at different cultivation periods. The rice seedlings of this experiment can be selected as the first-stage rice or the second-stage rice. When the rice seedlings are the first-stage rice, the first cultivation step is to cultivate the rice seedlings in the cultivated land for 20 to 30 days, and the second cultivation step is to cultivate the rice mature plants in the cultivated land for 15 to 25 days. When the rice seedlings are the second-stage rice, the first cultivation step is to cultivate the rice seedlings in the cultivated land for 15 to 25 days, and the second cultivation step is to cultivate the rice mature plants in the cultivated land for 15 to 25 days.

After being cultivated by the cultivation method of the low-protein rice of the present invention, the rice seedlings will grow into mature rice plants, and the mature rice plants will produce heading and mature, so as to harvest the low-protein rice of Example 1. The low-protein rice of Example 1 is tested in terms of nutritional composition according to CNS5035, the test method for crude protein in food (revised on August 4, 1986), so as to illustrate the protein content of the low-protein rice cultivated by the cultivation method 100 of the low-protein rice of the present invention. Furthermore, this experiment also simultaneously tested the potassium content of the low-protein rice of Example 1, wherein the potassium content analysis was conducted in accordance with the General Rules for Heavy Metal Testing Methods (MOHWH0014.03) as amended by the Ministry of Health and Welfare's Announcement No. 1031901169 on August 25, 2014, to further illustrate the feasibility of using the low-protein rice cultivated by the cultivation method 100 of the low-protein rice of the present invention in the dietary control plan for patients with chronic kidney disease.

In addition, this experiment also includes Comparative Example 1 and Comparative Example 2, wherein Comparative Example 1 is commercially available Koshihikari rice, and Comparative Example 2 is commercially available glutinous rice, and the protein content and potassium content of Comparative Example 1 and Comparative Example 2 are taken from the average nutritional value of Koshihikari rice and the average nutritional value of glutinous rice in the food nutritional composition database published by the Food and Drug Administration of the Ministry of Health and Welfare.

In addition, this experiment also includes a control group, which is to cultivate Tainan No. 16 rice plants using a known cultivation method, and observe the difference in protein content of the cultivated Tainan No. 16 rice. Specifically, when the rice plants in the control group are the first-stage rice, the total amount of nitrogen applied is 110-140 kg per hectare, the total amount of phosphoric acid applied is 40-60 kg per hectare, and the total amount of potassium applied is 30-50 kg per hectare; and when the rice plants in the control group are the second-stage rice, the total amount of nitrogen applied is 90-120 kg per hectare, the total amount of phosphoric acid applied is 30-40 kg per hectare, and the total amount of potassium applied is 40-60 kg per hectare.

Furthermore, in the control group, a basal fertilizer containing nitrogen, phosphoric acid and potassium was applied to the cultivated land during the land preparation step, wherein the nitrogen application amount was 20% to 30% of the total nitrogen application amount, the phosphoric acid application amount was 100% of the total phosphoric acid application amount, and the potassium application amount was 20% of the total potassium application amount. Then, 10 to 15 days after transplanting, a first topdressing containing nitrogen and potassium was applied, wherein the nitrogen application amount was 20% of the total nitrogen application amount, and the potassium application amount was 30% of the total potassium application amount. Then, 20 to 30 days after transplanting, a second topdressing containing nitrogen and potassium was applied, wherein the nitrogen application amount was 30% of the total nitrogen application amount, and the potassium application amount was 30% of the total potassium application amount. Furthermore, the control group was further fertilized with 20% to 30% of the total nitrogen application amount and 20% of the total potassium application amount as ear fertilizer 45 to 70 days after transplanting (or when the ear length was 0.2 to 0.5 cm). After the Tainan No. 16 rice of the control group was harvested, the protein content was tested using the CNS5035 crude protein test method in food to illustrate the difference in protein content between the low-protein rice cultivated by the cultivation method of the low-protein rice of the present invention, the rice cultivated by the cultivation method of the low-protein rice not of the present invention, and the commercially available rice.

Please refer to Table 1, which shows the protein content analysis results of the low-protein rice of Example 1, the control group of Tainan No. 16 rice, the Koshihikari rice of Comparative Example 1, and the stalked rice of Comparative Example 2. Table 1 Protein content (g/100g) Embodiment 1 4.2 Control group 6.7 Comparison Example 1 7.6 Comparison Example 2 7.0

As shown in Table 1, when 100 grams is taken as the unit, the protein content of the low-protein rice of Example 1 is 4.2 grams, which is significantly lower than 6.7 grams of the Tainan No. 16 rice of the control group, 7.6 grams of the Koshihikari rice of Comparative Example 1, and 7.0 grams of the stalked rice of Comparative Example 2, indicating that the low-protein rice cultivated by the cultivation method of the low-protein rice of the present invention has a lower protein content than the commercially available products.

Please refer to Table 2, which shows the potassium content analysis results of the low-protein rice of Example 1, the Koshihikari rice of Comparative Example 1, and the glutinous rice of Comparative Example 2. Table 2 Potassium content (g/100g) Embodiment 1 77 Comparison Example 1 90 Comparison Example 2 79

As shown in Table 2, the potassium content of the low-protein rice of Example 1 is 77 grams per 100 grams, which is less than 90 grams of the Koshihikari rice of Comparative Example 1 and 79 grams of the stalked rice of Comparative Example 2, indicating that the low-protein rice cultivated by the cultivation method of the low-protein rice of the present invention not only has a lower protein content, but also has a lower potassium content, so that the low-protein rice cultivated by the cultivation method of the low-protein rice of the present invention can be applied to the diet control plan of patients with chronic kidney disease and has excellent market application potential.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined in the attached patent application.

100: Low-protein rice cultivation method 110,120,130,140,150: Steps

In order to make the above and other purposes, features, advantages and embodiments of the present invention more clearly understood, the attached drawings are described as follows: Figure 1 is a flow chart showing the steps of the cultivation method of low-protein rice of the present invention.

100: Cultivation method of low-protein rice

110,120,130,140,150: Steps

Claims (10)

A method for cultivating low-protein rice, comprising: Performing a land preparation step, which is to apply a first fertilizer composition to a cultivated land, wherein the first fertilizer composition comprises phosphoric acid, nitrogen and potassium, and based on the phosphoric acid being 1 weight percent, the nitrogen being 2.5-4.5 weight percent, and the potassium being 1.5-3 weight percent; Performing a rice transplanting step, which is to plant a rice seedling in the cultivated land; A first cultivation step is performed, which is to cultivate the rice seedling in the cultivated land for 15 to 30 days and apply a second fertilizer composition to obtain a rice plant, wherein the second fertilizer composition is applied at least once in the first cultivation step, and the second fertilizer composition comprises magnesium, manganese, iron, boron, zinc and copper, and based on the copper being 1 weight percent, the magnesium being 6 to 18 weight percent, the manganese being 2 to 6 weight percent, the iron being 1.5 to 6 weight percent, the boron being 1 to 3 weight percent, and the zinc being 2 to 5 weight percent; A second cultivation step is performed, which is to cultivate the rice plant in the cultivated land for 15 to 30 days and apply a third fertilizer composition to make the rice plant enter the breeding period, and the third fertilizer composition is applied at least once in the second cultivation step, wherein: The third fertilizer composition contains magnesium, manganese, iron, boron, zinc, copper, phosphate, nitrogen and potassium, and based on the copper being 1 weight percent, the magnesium being 6 to 18 weight percent, the manganese being 2 to 6 weight percent, the iron being 1.5 to 6 weight percent, the boron being 1 to 3 weight percent, and the zinc being 2 to 5 weight percent; and The weight percentage of the phosphoric acid in the third fertilizer composition is 1/20 to 1/50 of the weight percentage of the phosphoric acid in the first fertilizer composition, the weight percentage of the nitrogen in the third fertilizer composition is 1/20 to 1/50 of the weight percentage of the nitrogen in the first fertilizer composition, and the weight percentage of the potassium in the third fertilizer composition is 1/20 to 1/50 of the weight percentage of the potassium in the first fertilizer composition; and Performing a harvesting step, which is harvesting the rice plants to obtain a plurality of low-protein rices, wherein the protein content of the low-protein rices is less than 6 grams of protein per 100 grams of the low-protein rices. The method for cultivating low-protein rice as described in claim 1, wherein the organic matter content of the cultivated land is 0.5% to 3.5%. The method for cultivating low-protein rice as described in claim 1, wherein a pH value of the cultivated land is 5.5-7.5. The method for cultivating low-protein rice as described in claim 1, wherein the rice plant is a first-stage rice or a second-stage rice. The method for cultivating low-protein rice as described in claim 4, wherein when the rice plantlets are the first-stage crop rice, the first cultivation step is to cultivate the rice plantlets in the cultivated land for 20 to 30 days. The method for cultivating low-protein rice as described in claim 5, wherein when the rice seedlings are the first-stage crop rice, the second cultivation step is to cultivate the mature rice plants in the cultivated land for 15 to 25 days. The method for cultivating low-protein rice as described in claim 4, wherein when the rice plantlets are the second-stage crop rice, the first cultivation step is to cultivate the rice plantlets in the cultivated land for 15 to 25 days. The method for cultivating low-protein rice as described in claim 7, wherein when the rice seedlings are the second-stage crop rice, the second cultivation step is to cultivate the mature rice plants in the cultivated land for 15 to 25 days. The method for cultivating low-protein rice as described in claim 1, wherein the second fertilizer composition is applied to the young rice plants in the form of foliar fertilization. The method for cultivating low-protein rice as described in claim 1, wherein the third fertilizer composition is applied to the mature rice plants in the form of foliar fertilization.

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