WO2023031846A1

WO2023031846A1 - Herbicidal composition for crop management and method thereof

Info

Publication number: WO2023031846A1
Application number: PCT/IB2022/058216
Authority: WO
Inventors: Keshav ANAND; Shivraj Anand; Uday ANAND; Sarvind DHIMAN
Original assignee: Parijat Industries India Pvt Ltd
Current assignee: Parijat Industries India Pvt Ltd
Priority date: 2021-09-02
Filing date: 2022-09-01
Publication date: 2023-03-09
Anticipated expiration: 2024-03-02
Also published as: ZA202400222B; CN117479840A

Abstract

Disclosed herein, a synergistic composition of metribuzin and fluroxypyr for controlling a wide spectrum of weeds and method for producing and use thereof. The composition is emulsifiable concentrate consist of two herbicides in an effective ratio developed to create an Oil/water emulsion when concentrate added into water.

Description

HERBICIDAL COMPOSITION FOR CROP MANAGEMENT AND METHOD

THEREOF

Field of the Invention

The present invention generally relates to herbicidal composition for crop production management. More particularly, the present invention provides a synergistic composition of metribuzin and fluroxypyr esters, salts or combination thereof for controlling a wide spectrum of weeds and method thereof.

Background of the Invention

Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the present invention, or that any publication specifically or implicitly referenced is prior art.

For realizing full genetic yield potential of the crop, the proper weed control is one of the essential ingredients. Weeds not only reduce the yield but also make the harvesting operation difficult. Therefore, for sustaining food grain production to feed ever- increasing population and ensuring food security, effective weed management is very essential. Manual and mechanical methods are laborious, tiresome, and expensive due to increasing cost of labor, and weeds cannot effectively be managed merely due to crop mimicry. Therefore, it is a requirement to devise a method, which are economical and less time consuming for better yield of the crop. One of the method is chemical method using herbicides. However, most of the herbicidal formulations are having limitations of having phytotoxic effects, distorted leaves, colour changes of leaves and many more side effects in crop plants.

The new agricultural strategy expansion of irrigation, adoption of high yielding varieties under conditions of heavy fertilizer application helped a lot in increasing wheat crop growth, production, and productivity, however, these strategies have also stimulated various weed flora growth faced by the wheat growers which can cause significant yield loss. The undesirable competition includes broad leaf weeds and grasses. Weeds account for about one third of total losses caused by all pests. Therefore, the use chemical weed control has become necessary.

Currently various chemical methods have been developed by combining various herbicides and using such formulation for crop production management, however, such formulation is not that much effective to handle all the harmful effects of the crop plants.

Chemical weed control method is the most ideal, practical, effective, up-to-date, time saving and economical means of reducing early weed competition and crop production losses. But the exclusive reliance on same herbicides has resulted in pollution of the environment and some weed species becoming resistant and inter- and intra-specific shifts.

Considering the existing challenges according to the current methods, there is need to devise and evaluate the efficacy of suitable postemergence herbicides alone and in mixture for effective control of broad leaf weeds and grasses that can help in resistance management.

Summary of the Invention

It is primary objective of the present invention is to provide a synergistic herbicidal composition for crop production management.

It is another objective of the present invention is to provide a synergistic herbicidal composition for effective control of broad leaf weeds and grasses that can help in resistance management.

It is another objective of the present invention is to provide a synergistic herbicidal composition formulated to form a stable emulsion concentrate formulation.

It is another objective of the present invention is to provide a synergistic herbicidal composition formulated to form clear transparent emulsified concentrate formulation.

The above and other objectives of the present invention are achieved according to the following embodiments of the present invention. However, the disclosed embodiments are exemplary based on the preferred and best mode of the invention and not limit the scope of the present invention.

In accordance with one embodiment of the present invention, there is provided a herbicidal composition for crop production management comprising 5-50% of Fluroxypyr, 1-50% of Metribuzin, 2 to 50 % of Polar/ Non polar solvent as co-solvent, 2 to 30 % of Emulsifiers, 0.1 to 50 % of agriculturally acceptable adjuvant.

In accordance with one other embodiment of the present invention, there is provided a herbicidal composition for crop production management comprising 5-50% of Fluroxypyr, 1-50% of Metribuzin, 2 to 50 % of Polar/ Non polar solvent as co-solvent, 2 to 30 % of Emulsifiers, 0.1 to 50 % of agriculturally acceptable adjuvant, wherein said composition is a two -way combination composition formulated to form a stable emulsion concentrate formulation.

In accordance with another embodiment of the present invention, there is provided a herbicidal composition for crop production management comprising 5-50% of Fluroxypyr, 1-50% of Metribuzin, 2 to 50 % of Polar/ Non polar solvent as co-solvent, 2 to 30 % of Emulsifiers, 0.1 to 50 % of agriculturally acceptable adjuvant, wherein the resultant composition is clear transparent emulsified concentrate formulation.

In accordance with another embodiment of the present invention, there is provided a method for preparing herbicidal composition for crop production management comprising stirring a blend of N Methyl pyrrolidone and a solvent C-9 with metribuzin tech to dissolve consistently, adding Fluroxypyr tech into resultant solution and keep stiring till to dissolve technical, addingagriculturally acceptable adjuvant and stirring the resultant, and adding emulsifiers into the resultant and keep formulation under stir for a least 45 min to get clear emulsified concentrate formulation.

These and other objectives and embodiments of the invention will become more fully apparent when the following detailed description is read with the accompanying study details and examples. However, both the foregoing summary of the invention and the following detailed description of it represent one potential experiments and embodiment and are not restrictive of the invention or other alternate embodiments of the invention.

Detailed Description of the Invention

The following is a detailed description of embodiments of the disclosure depicted in the accompanying experimental details and supporting study data. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.

Various terms as used herein in the invention is not defined and it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.

According to the present invention, there is provided a herbicidal composition for crop production management, wherein said composition is emulsifiable Concentrate consist of two herbicides in a specific ratio developed to create an Oil/water emulsion when concentrate added into water, and wherein said concentrate is a two -way combination formulated defined in below table chemical composition to form a stable emulsion concentrate formulation. Metribuzin A.I dissolve in organic solvent and add fluroxypyr Tech under stirring then add defined emulsifiers to prepare to clear transparent EC formulation.

In accordance with on embodiment of the present invention have the combination of metribuzin and fluroxypyr including esters, salts thereof and an agriculturally acceptable carriers are provided.

In accordance with an embodiment of the present invention, the particular synergism can also be observed for the three way combination holding the compound as metribuzin, fluroxypyr and pinoxaden or metribuzin , fluroxypyr or clodinafop . In accordance with one embodiment of the present invention, the resultant formulation/composition can be applied jointly as a final product or the resultant can be applied in succession into the field.

In accordance with an embodiment of the present invention the resultant compositions is made at the time of use by diluting with spray solution, or it can be used as concentrated compositions like as a “ready to use compositions”.

The composition/formulation can be employed in any conventional form like twin pack or as emulsifiable concentrates, microemulsion concentrates (MEC), Suspension concentrates (SC), Soluble Concentrates (SL), Suspo emulsion (SE), or any solid compositions like WDG or granules, wherein such combinations can be formulated using the agriculturally acceptable carriers, surfactants or other application promoting adjuvants.

According to one of the embodiment, the Emulsifiable Concentrate (EC) comprises of 5 to 50 % of Fluroxypyr (A E) A.I, 1 to 50 % of Metribuzin A. I, 2 to 50 % of N-Methyl Pyrrolidone, 2 to 30 % of emulsifiers, 0.1 to 50 % of Ethoxylated Alkyl Alcohols and Solvent Naphtha C-9/ C-10 grade solvent in QS to make 100%.

According to one of the embodiment, the Emulsifiable Concentrate (EC) comprises of 5 to 50 % of Fluroxypyr (A E) A.I, 1 to 50 % of Metribuzin A. I, 2 to 50 % of Polar/ Non polar solvent as co-solvent, 2 to 30 % of Emulsifiers, 0.1 to 50 % of adjuvant(Non-Ionic wetting agent) and Solvent Naphtha C-9/ C-10 grade solvent in QS to make 100%.

According to the present invention, the emulsifier is selected from a group comprising Benzenesulphonic acid, 4-C10-14-alkyl derives, calcium salts, / or ethoxylated tristryl phenol, or Blend of Calcium salt of dodecyl benzene sulphonate & polyethanoxy ether derivative or in combination thereof.

According to the present invention, the Polar/ Non polar solvent as co-solvent used in the composition is N-Methyl Pyrrolidone. As desired other suitable liquid carriers can be used in compositions which includes but not excludes a carrier like water, aromatic or aliphatic hydrocarbons, alcoholic solvents like hexanol, decanol etc.

According to the present invention, the adjuvant is agriculturally acceptable adjuvant and preferably a Non-Ionic wetting agent, most preferably Ethoxylated Alkyl Alcohols.

According to the present invention, the formulation can be enhanced by adding other ingredients such as wetting agents, anti-foaming, adhesives, neutralizers, thickeners, binders, sequestrants, stabilizers, solubilizers, salts, fertilizers, or anti-freeze agents.

Below are the various examples for preparing different compounds according to the present invention. However, the below examples are not limited and will be further worked on within the scope of the current invention and filed:

Example 1

Example 2

Example 3

Manufacturing process:

1. Weigh defined quantity of Metribuzin tech & transfer into Glass beaker.

2. Add N Methyl pyrrolidone + Solvent C-9 & stir the mass to dissolve metribuzin tech.

3. Now add slowly Fluroxypyr tech into beaker, keep stir till to dissolve technical.

4. Keep stir on and add agriculturally acceptable adjuvant Adjuvant.

5. Add emulsifiers and keep formulation under stir for a least 45 min to get clear formulation.

Synergy Study

The following formula was used to calculate the expected activity of mixtures containing active ingredients, A and B: Expected (E)

Where

A = Observed efficacy of active ingredient (combination of Metribuzin and Fluroxypyr herbicides) A at the same concentration as used in the mixture.

B = observed efficacy of active ingredient B at the same concentration as used in the mixture.

The field experiments were carried out to test the synergy of the combination of Metribuzin and Fluroxypyr against weeds in wheat (variety: PBW 667) at Ambala Research Farm, Haryana during Rabi season. The soil was sandy loam in texture. The experiment comprising of 8 treatments including premixed binary combinations along with their stand-alone molecule using a randomized block design replicated thrice. All the treatments were applied as post-emergence foliar application when the weeds reached to two to four leaf stage. The spray was conducted with the help of Battery-operated Knapsack sprayer. The percentage efficacy was calculated after 14 and 21 days after application of herbicides.

Weeds present in the experimental fields: Chenopodium album, Rumex dentatus, Anagalis arvensis, Medicago denticulata, Solanum nigrum, Argemone maxicana, Parthenium hysterophorus, Melilotus indica, Phalaris minor.

The herbicide premix molecule application rates, various weed flora tested, and results are given in the following tables:

Table 1: Synergistic activity of herbicidal compositions on major weeds in wheat at 14 days after application

The results in table 1, 2, 3, 4, 5, and 6 clearly demonstrates synergy of premix molecule for controlling various weeds at 14 days and 21 days after application of the herbicides. The difference between the observed and the expected efficacy clearly shows the synergistic effect of the combination for longer duration.

Phytotoxic effect of herbicidal combination on Wheat

Table 7. Visual observations on phytotoxicity were recorded for leaf injury on tip/surface, Epinasty/Hyponasty, and wilting etc on 0-10 scale (as below) at 3, 5, 7, 10 and 15 days after herbicidal application.

There was no Phytotoxicity or crop injury or burning of leaves etc. recorded on wheat crop at the recommended doses but at the double dose in Treatment 4 and 5 leaf tip yellowing observed on the 5^th day after application of herbicide. On 7^th day and 10^th day, leaf tips were burnt, and growth remained slightly stunted when compared with other treatments. However, on 15^th day crop was recovered completely and new growth from the plants were observed completely healthy and normal.

Table 9: Effect of herbicidal composition on wheat grain yield

The data presented in table 9 revealed that all herbicidal treatments significantly increased the grain yield of wheat over control. Among all the herbicidal treatments, maximum grain yield (4889 kg/ha) was obtained in treatment 1 which remained at par with treatments 2 and 3.

Accelerated storage stability data

Storage Condition: - 54 deg. Cent for 14 D in Hot Air Oven/ Stability Chambers

While the invention is amenable to various modifications and alternative forms, some embodiments have been illustrated by way of example in the drawings and are described in detail above. The intention, however, is not to limit the invention by those examples and the invention is intended to cover all modifications, equivalents, and alternatives to the embodiments described in this specification.

The embodiments in the specification are described in a progressive manner and focus of description in each embodiment is the difference from other embodiments. For same or similar parts of each embodiment, reference may be made to each other.

It will be appreciated by those skilled in the art that the above description was in respect of preferred embodiments and that various alterations and modifications are possible within the broad scope of the appended claims without departing from the spirit of the invention with the necessary modifications.

Based on the description of disclosed embodiments, persons skilled in the art can implement or apply the present disclosure. Various modifications of the embodiments are apparent to persons skilled in the art, and general principles defined in the specification can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments in the specification but intends to cover the most extensive scope consistent with the principle and the novel features disclosed in the specification.

Claims

We Claim:

1. A herbicidal composition for crop production management comprising: i) 5-50% of Fluroxypyr; ii) 1-50% of Metribuzin; iii) 2 to 50 % of Polar/ Non polar solvent as co-solvent; iv) 2 to 30 % of Emulsifiers; v) 0.1 to 50 % of agriculturally acceptable adjuvant

2. The composition as claimed in claim 1, wherein said composition is a two -way combination composition formulated to form a stable emulsion concentrate formulation or suspo emulsions formulation or emulsions in water formulation .

3. The composition as claimed in claim 1, wherein the Polar/ Non polar solvent as cosolvent used in the composition is N-Methyl Pyrrolidone.

4. The composition as claimed in claim 1, wherein the emulsifier used in the composition is selected from Benzenesulphonic acid, 4-C10-14-alkyl derives., calcium salts, / or ethoxylated tristryl phenol, or Blend of Calcium salt of dodecyl benzene sulphonate & polyethanoxy ether derivative or in combination thereof.

5. The composition as claimed in claim 1, wherein the agriculturally acceptable adjuvant is Non-Ionic wetting agent, preferably Ethoxylated Alkyl Alcohols.

6. The composition as claimed in claim 1, wherein the resultant clear transparent emulsified concentrate formulation.

7. A method for preparing herbicidal composition for crop production management comprising: stirring a blend of N Methyl pyrrolidone and a solvent C-9 with metribuzin tech to dissolve consistently; adding Fluroxypyr tech into resultant solution and keep stiring till to dissolve technical; adding agriculturally acceptable adjuvant Adjuvant and stirring the resultant; and adding emulsifiers into the resultant and keep formulation under stir for a least 45 min to get clear emulsified concentrate formulation.

8. The method as claimed in claim 7, wherein the Metribuzin used is 1-50% and the Fluroxypyr is 5-50% by weight of the compostion.

9. The method as claimed in claim 7, wherein the emulsifier used in the composition is selected from Benzenesulphonic acid, 4-C10-14-alkyl derives., calcium salts, / or ethoxylated tristryl phenol, or Blend of Calcium salt of dodecyl benzene sulphonate & polyethanoxy ether derivative or in combination thereof.

10. The method as claimed in claim 7, wherein the agriculturally acceptable adjuvant is NonIonic wetting agent, preferably Ethoxylated Alkyl Alcohols.