Agricultural Composition
Agricultural compositions which comprises (i) a water-soluble salt of calcium and (ii) an auxin mimic that is an aryl substituted urea, for administering calcium to plants. The compositions particularly include diphenylurea as the auxin mimic. Also formulations containing the compositions and methods of their uses are included.
1. An agricultural composition which comprises (i) a water-soluble salt of calcium and (ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.
2. A composition according to claim 1 wherein the water-soluble salt of calcium is a nitrate, sulphate or chloride.
3. A composition according to claim 1 wherein the water-soluble salt of calcium is present in the composition in an amount from 2 to 15% w/w of the composition.
4. A composition according to claim 3 wherein the water-soluble salt of calcium is present in the composition in an amount from 4 to 6% w/w.
5. A composition according to claim 1 wherein the auxin mimic is a weak auxin mimic that is not able to cause an auxin growth response.
6. A composition according to any one of the preceding claims wherein the auxin mimic is able to produce within a plant one or more of the effects that the plant hormone cytokinin naturally produces.
7. A composition according to claim 1 wherein the auxin mimic is diphenyl urea (DPU), 2-nitro diphenyl urea (NDPU), mono- or di-methyl diphenyl urea or mono- or di-ethyl diphenyl urea.
8. A composition according to claim 1 wherein the auxin mimic is diphenyl urea.
9. A composition according to claim 1 wherein the auxin mimic is present within the composition at a concentration of 20 to 2000 ppm.
10. A composition according to claim 9 wherein the auxin mimic is present at a concentration in the range of 20 to 200 ppm.
11. A composition according to claim 1 which further comprises one or more of the following agriculturally acceptable components: water, additional nutrient material, weak acids, plant oils, essential oils, metabolic stimulating agents, carriers or excipients, emulsifiers, thickeners, suspension agents, dispersion agents or wetting agents.
12. A composition according to claim 11 , which comprises a nutrient material, wherein that nutrient material is zinc.
13. A composition according to claim 11 , which additionally comprises a weak acid selected from the group consisting of acetic, citric, humic, fulvic and propanoic acid.
14. A composition according to claim 11 , which additionally comprises the thickener beet molasses.
15. A formulation for administration to plants or to the environment of plants, comprising a composition according to claim 1 and a medium in which the composition is dispersed or dissolved.
16. A method for supplying calcium to plants, which method comprises applying to the plants or to the environment thereof a composition according to claim 1 .
17. A method for fertilizing crops comprising administering to said crop or the soil in which the crop is growing an effective amount of a fertilizer composition according to claim 1 .
18. A method for fertilizing crops comprising administering to said crop or the soil in which the crop is growing an effective amount of a fertilizer composition according to claim 15 .
19. A method for supplying calcium to plants which method comprises applying to the plants or to the soil in which the plants are growing a formulation according to claim 15 .
20. A method for enhancing the uptake of calcium by plants, which method comprises applying to the plants or to the soil in which the plants are growing a composition which comprises:
(i) a water-soluble salt of calcium and
(ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.
21. A method for increasing cellular integrity by preventing areas of local calcium deficiency which method comprises applying to the plants or to the soil in which the plants are growing a composition which comprises:
(i) a water-soluble salt of calcium and
(ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.
22. A method for reducing physiological disorders associated with calcium insufficiency which method comprises applying to the plants or to the soil in which the plants are growing a composition which comprises: (i) a water-soluble salt of calcium and (ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.
23. A method for improving shelf life of a harvested crop by enhancing calcium absorption into the harvested parts of a plant, which method comprises applying to the plants or to the soil in which the plants are growing a composition which comprises:
(i) a water-soluble salt of calcium and
(ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.
24. A method for preventing or alleviating disease or infection in plants which occur in areas of local calcium insufficiency, which method comprises applying to the plants or to the soil in which the plants are growing a composition which comprises:
(i) a water-soluble salt of calcium and
(ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.
25. A method for improving growth habit during unusually hot or cold conditions, which method comprises applying to the plants or to the soil in which the plants are growing a composition which comprises:
(i) a water-soluble salt of calcium and
(ii) an auxin mimic that is an unsymmetrically or a symmetrically substituted diphenyl urea or a derivative thereof wherein one or both phenyl groups are optionally substituted and wherein the auxin mimic is present within the composition at a concentration of 0.001 to 5% w/w.