FR2506296A1 - Zinc sulphate and zinc acetate compsn. - for treatment of zinc deficiency in maize crops - Google Patents

Abstract

Aqueous compsn. comprises a buffer solution for maintaining the pH of the dilution water at about 7 and contains per litre of solution 70-304 g, pref. 150 g, of zinc sulphate and 67-267 g, pref. 140 g, of zinc acetate. Pref. the zinc sulphate/zinc acetate ratio is 0.7-1.5, pref. 1.1. The solution may also contain calcium sulphate (87-348 g, pref. 135 g), magnesium sulphate (50-200 g, pref. 100 g), ammonium molybdate (0.4-3.6 g, pref. 1 g), anhydrous sodium tetraborate (10-40 g, pref. 20 g), copper sulphate (12-56 g, pref. 30 g), manganese sulphate (12-50 g, pref. 29 g), citric acid (20 g), monosodium citrate (12 g) monopotassium phosphate (3 g) and water (0.760 l). Treatment of zinc deficiency in maize crops. The present compositions avoid toxicity and/or availability problems associated with previously used zinc sulphate, zinc nitrate and zinc chloride. The solution may be used preventatively by application to the soil or curatively by foliar application. The mixture is applied at the pre- or post-emergent stage using 10 l of soln. per hectare, which is diluted with 500-2000 l, pref. 1000 l, of water before application. Production of 5000 kg/hectare of maize requires about 700 g of zinc (as metal).

Description

Aqueous solution for the treatment of zinc deficiencies on penalty, manufacturing process and application.

 The present invention relates to an aqueous solution for the treatment of zinc deficiencies on the penalty, a method of manufacturing such a solution and its application to the cultivation of mal.

 The technical sector of the invention is that of plant health products.

 We know that regardless of the need for major elements, corn consumes all the trace elements necessary for the constitution of its cells, its growth and the development of proteins. The main trace elements are: - zinc; the copper; manganese. Other trace elements such as boron, molybdenum, magnesium are also essential for the nitrogen cycle, the formation of proteins and the metabolism of calcium.

 Currently, only copper and zinc deficiencies are really taken into account.

 The current technique for treating zinc deficiencies on the penalty consists in bringing to the soil, before or after sowing, soluble solutions of trace elements such as zinc sulphate, zinc nitrate or zinc chloride.

This technique has several disadvantages
- Salts can quickly be blocked on excess limestone or organic matter. In addition, unfavorable climatic conditions can prevent its assimilation by the plant, for example in cold and humid weather.

 - The joint application in soils of ammonium phosphates and sulphate and zinc nitrate leads to bringing into contact two soluble salts which can combine to achieve the formation of an insoluble zinc phosphate which then leads to total ineffectiveness or partial of the elements used.

 - The contribution of zinc or copper solves the problem of a deficiency, but fails to solve that of a complete and balanced diet.

 - These contributions are only preventive but not curative, zinc nitrate sulfates and copper sulfates being highly phytotoxic on young corn seedlings.

 The use of salts such as sulphate, nitrate or zinc chloride cannot be carried out by foliar route due to their phytotoxicity. The application of said salts buried in the soil does not make it possible to obtain a curative effect on the treated plants.

 The present invention aims to remedy these drawbacks.

 The objective to be reached is a compound rich in zinc to provide under well-defined conditions the quantity of metal necessary for the feeding of the penalty and which can be used preventively by application to the soil, or curatively, by foliar route, without causing any phenomenon. phytotoxicity.

 We know indeed that for a production of penalties of around one hundred quintals per hectare, it is necessary to bring seven hundred grams of pure zinc.

 The solution according to the invention is obtained by the use of two forms of zinc, one of which can be assimilated by plants and microorganisms.

your quantities of pure metal to be provided by said solution, for zinc deficiencies on the penalty, are as follows
- zinc: from 100 to 400 g., preferably 210 g. acetate.

 - zinc: from 80 to 350 g., preferably 172 g. sulfate.

The balance between these two forms of zinc must be close to 1 but can be included in the following range
- from 0.7 to 1.5, preferably 1.1.

 These two elements can be complemented by two elements such as calcium and magnesium whose role is to strengthen cell walls and reduce the risk of phytotoxicity of zinc (neutralization phenomenon).

These two elements are brought in the form of sulfate in the following quantities
- calcium: from 100 to 400 g., preferably 155 g. sulfate.

 - magnesium: from 50 to 200 g., preferably 100 g. sulfate.

 Four other trace elements can be added to the above-mentioned elements: boron, manganese, copper and molybdenum, the role of which is to accelerate the metabolism of the plant and allow better assimilation of zinc.

These elements brought in the form of
- sodium tetraborate for boron;
- sulfate for manganese and copper;
- and ammonium molybdate for molybdenum, are provided in the following quantities
- boron: from 10 to 40 g., preferably 21 g. sodium tetraborate;
- manganese: from 20 to 80 g., preferably 46 g. sulfate;
- copper: from 15 to 70 g., preferably 37.5 g. sulfate;
- molybdenum: from I to 10 g., preferably 2.7 of ammonium molybdate.

The balance of pure metals between them must be as follows
- Zn / Ca: from 0.45 to 7.5, preferably 2.4.

- Zn / Mg: from 0.9 to 15, preferably 3.8
- CaíMg: from 0.5 to 8, preferably 1.5.

All the mineral elements used in the composition of the solution according to the invention are buffered by means of a buffer solution, the formula of which is as follows
- citric acid: ........ five parts
- monosodium citrate: ... four parts
- monopotassium phosphate: one part.

 The purpose of this buffer is to ensure the protection of the solution to compensate for excess calcium or iron or any other sequestering element and perfect solubilization and held in dilution water while maintaining the pH of the solution. of use close to 7, preferably 6.6, regardless of the starting pH of the feed water used in the composition of the solution.

To achieve the objective of the invention, a solution is proposed - for the treatment of zinc deficiencies on corn but comprising a buffer solution to bring the pH of the dilution water to a value close to 7, characterized in that which it contains in combination for a liter of solution
- from 70 to 304 g. zinc sulfate, preferably 150 g .;
and
- from 67 to 267 g. zinc acetate, preferably 140 g.

 Other trace elements may be associated with the above salts.

The solution thus also comprises
- from 87 to 348 g. calcium sulfate, preferably 135 g.

and
- from 50 to 200 g. magnesium sulfate, preferably 100 g.

Also, it also includes
- from 0.4 to 3.6 g. ammonium molybdate, preferably I g;
- from 10 to 40 g. anhydrous sodium tetraborate, preferably 20 g. ;
- from 12 to 56 g. copper sulphate, preferably 30 g .;
- from 12 to 50 g. manganese sulphate, preferably 29 g.

For a liter of product, the composition of the solution is as follows
- from 67 to 267 g. zinc acetate, preferably 140 g.

- from 70 to 304 g. zinc sulfate, preferably 150 g. ;
- from 87 to 348 g. calcium sulphate, preferably 135 g .;
- from 0.4 to 3.6 g. ammonium molybdate, preferably Ig .;
- from 10 to 40 g. anhydrous sodium tetraborate, preferably 20 g. ;
- from 12 to 56 g. copper sulfate, preferably 30 g;
- from 50 to 200 g. magnesium sulfate, preferably 100 g.

- from 12 to 50 g. manganese sulfate, preferably 29 g .;
- 20 g. citric acid;
- 12 g. monosodium citrate;
- 3 g. monopotassium phosphate;
- 0.760 1. of water.

 The application of the aqueous solution according to the invention for the treatment of zinc deficiencies on the pre-emergence or post-emergence penalty is characterized by the fact that for one hectare treated, -dPx liters of solution are applied in l dilution water from 500 liters to 2000 liters, preferably 1000 liters.

The process for manufacturing the solution according to the invention is characterized by the following operations
- in the amount of water making up the solution
a) - citric acid, monosodium citrate, monopotassium phosphate are first incorporated;
b) - then anhydrous sodium tetraborate is incorporated;
c) - finally incorporate the other trace elements.

 The result of the invention is a phyto-sanitary product rich in zinc for the treatment of zinc deficiencies on corn but which can be used preventively by application to the soil in pre-emergence or curatively by foliar route in post-emergence.

 The solution according to the invention has many advantages: it is obtained from a combination of several totally soluble trace elements with high assimilation power.

 Being buffered so as to ensure its protection against excess limestone, iron or any other sequestering element, the solution remains always completely available to the plant whatever the conditions of use.

 The quantities of zinc, manganese and copper correspond to the needs of maize for a production of the order of one hundred quintals per hectare.

 Magnesium, boron and molybdenum act as a catalyst for the nitrogen cycle, sutfo-proteins and as a growth promoter.

The solution according to the invention has no phytotoxicity character. In a single contribution it covers the needs for zinc, copper, manganese and
- regulates the nitrogen cycle
- limits the risks of ammonia poisoning;
- improves the assimilation of phosphorus and potash;
- regulates the metabolism of calcium;
- promotes the formation of sulfo-proteins.

 Used in pre-emergence, it remains totally available by the penalty, it does not combine to form insoluble precipitates.

 Used post-emergence, it is currently the only product that can be used on corn, after emergence and at any stage, without ever burning or necrosing the plants.

It therefore allows curative intervention on a deficiency
- either that the supply of trace elements, at the preventive stage, could not be made,
- either that the trace elements are blocked (cold and rainy weather),
- or that the supply is insufficient and that it is necessary to compensate for a temporary shortage in particular in the event of accelerated growth.

 In general, it can be used in conjunction with all conventional pesticides, particularly weedkillers or insecticides.

 In post-emergence, it has the characteristic of being able to be used in conjunction with foliar fertilizers rich in phosphorus, the action of which it supplements, provided, however, that these fertilizers do not contain a high proportion of phosphoric acid.

 In the case of a declared deficiency, it is the only product capable of restoring the correct order of things and therefore avoiding significant losses of yield following a diet deficient in trace elements.

Claims (10)

 -from 67 to 267 g. zinc acetate, preferably 140 g.  and  - from 70 to 304 g. zinc sulfate, preferably 150 g .;  I. Aqueous solution for the treatment of zinc deficiencies on the corn, comprising a buffer solution to bring the pH of the dilution water to a value close to 7, characterized in that it comprises in combination for a liter of solution  2. Solution according to claim 1, characterized in that the zinc sulphate / zinc acetate ratio is in the range 0.7 to 1.5, preferably 1.1.  3. Solution according to any one of claims 1 and 2, characterized in that it further comprises  - from 87 to 348 g. calcium sulfate, preferably 135 g.  - from 50 to 200 g. magnesium sulfate, preferably 100 g.  and  4. Solution according to any one of claims 1 to 3, characterized in that it further comprises  - from 0.4 to 3.6 g. ammonium molybdate, preferably 1 g .;  - from 10 to 40 g. anhydrous sodium tetraborate, preferably 20 g. ;  - from 12 to 56 g. copper sulphate, preferably 30 g.  - from 12 to 50 g. manganese sulfate, preferably 29 g .;  5. Solution according to any one of claims 1 to 4, characterized in that it is composed for one liter  - from 67 to 267 g. zinc acetate, preferably 140 g .;  - from 70 to 304 g. zinc sulfate, preferably 150 g .;  - - from 87 to 348 g. calcium sulphate, preferably 135 g .;  - from 0.4 to 3.6 g. ammonium molybdate, preferably t g .;  - from 10 to 40 g. anhydrous sodium tetraborate, preferably 20 g .;  - from 12 to 56 g. copper sulphate, preferably 30 g .;  - from 50 to 200 g. magnesium sulfate, preferably 100 g.  - 0.760 1. of water.  - 3 g. monopotassium phosphate;  - 12 g. monosodium citrate;  - 20 g. citric acid;  - from 1-2 to 50 g. manganese sulfate, preferably 29 g .;  6. Solution according to claim 3, characterized in that the balance of pure metals between zinc / manganese is included in the range  - from 0.45 to 7.5, preferably 2.4.  7. Solution according to claim 3, characterized in that the balance of pure metals between zinc / magnesium is included in the range  - from 0.9 to 15, preferably 3.8  8. Solution according to claim 3, characterized in that the balance of pure metals between calcium / magnesium is included in the range  - from 0.5 to 8, preferably 1.5.  9. A method of manufacturing the aqueous solution according to any one of claims 1 to 8, characterized by the following operations  - In the amount of water making up the solution  a) - citric acid, monosodium citrate, monopotassium phosphate are first incorporated;  b) - then anhydrous sodium tetraborate is incorporated;  c) - finally incorporate the other trace elements.  10. Application of the aqueous solution according to any one of claims 1 to 8 for the treatment of corn in pre-emergence or post-emergence, characterized in that for one hectare treated, jiix liters of solution are applied in dilution water from 500 liters to 2000 liters, preferably 1000 liters.