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Fertilizer-polymer mixtures which inhibit nitrification in soils

A technology of polymers and mixtures, applied in the field of partial metal salts of maleic acid-itaconic acid polymers and low pH water-based polymer mixtures

Active Publication Date: 2009-12-30
VERDESIAN LIFE SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems are particularly acute in reducing or eliminating nitrogen losses due to nitrification

Method used

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  • Fertilizer-polymer mixtures which inhibit nitrification in soils
  • Fertilizer-polymer mixtures which inhibit nitrification in soils
  • Fertilizer-polymer mixtures which inhibit nitrification in soils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this example, a series of UAN solutions were prepared, including the preferred maleic-itaconic acid polymers of the present invention. Specifically, each starting UAN solution contained 1 / 3 (by weight) urea, 1 / 3 (by weight) ammonium nitrate and 1 / 3 (by weight) water. Individual quantities of this UAN solution were then supplemented with 0.5% or 1% by volume polymer, wherein the polymer material had an initial pH of 1, 2 or 3.5, as shown in Table 1 below. Each UAN solution supplemented with polymer, as well as the two polymer-free control UAN solutions were diluted to 1 / 2 the UAN-polymer solution or the polymer-free control (by volume) to 1 / 2 water (by volume).

[0053] Pioneer 33P70 corn seeds were sown at 275,000 seeds / acre on April 10 on a parallel plot of Pembroke silt loam soil (Princeton, KY, USA) of the same size and then sprayed with the diluted solution three times on April 18 - four times. The results showed nitrogen levels of 75 lb / acre after three sprays...

Embodiment 2

[0060] In this test, the degree of nitrification in a soil subjected to severe nitrification (Woolper soil) is measured under laboratory conditions. Specifically, laboratory grade ammonium sulfate and 0.25% by weight and 0.5% by weight of the calcium partial salt (pH 1) of the preferred maleic-itaconic acid polymer of the present invention were used (taking the total weight of fertilizer and polymer as 100% by weight basis), two different fertilizer products were prepared. Each of these two fertilizer products and a control consisting of ammonium sulfate alone were mixed into equal amounts of test soil at equal addition levels. Thereafter, the amount of nitrate in each soil sample was measured over a period of 16 days.

[0061] The figures illustrate the results of this experiment. It will be seen that the control group showed high levels of nitrification, whereas the two polymer supplemented fertilizers resulted in a statistically significant reduction in nitrification. No...

Embodiment 3

[0063] This example is similar to the yield test of Example 1, involving the application of a solution of UAN-replenishment polymer to a corn-seeded plot of the same size (Courtland, Kansas, USA). The soil was Crete silt loam, pH 7.1, Bray P-I 18ppm, exchangeable K 220ppm, organic matter content 2.5%. Specifically, the plot had soybean residues, sowed (April 20) Pioneer 33B51 corn seeds in 30-inch rows on the plot, and applied starter (starter) 10-34-0 NPK fertilizer (10 gallon / acre). Six parallel test plots were used for each test solution. Shortly after sowing, a series of UAN-polymer solutions with varying amounts of polymer at various pH levels were sprayed (not added) over the plots to obtain an amount of N of 160 lbs / acre from each solution. During the growing season, the experimental field was irrigated according to need, and the corn was harvested on October 1, and the yield and average value were calculated. Table 2 below summarizes these trials.

[0064] Table 2...

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Abstract

Improved, low-pH aqueous polymer mixtures are provided which can be applied directly to soils or incorporated within ammoniacal nitrogen-containing fertilizers to inhibit nitrification in soils, thus enhancing plant uptake of ammonium and yields. The polymers are advantageously used as metal (e.g., Ca) salts or complexes at pH levels of up to about 2. The polymers have anionic functional groups and are highly water dispersible.

Description

technical field [0001] The present invention broadly relates to improved low pH aqueous polymer mixtures containing polymers having anionic (e.g. carboxylate) functional groups, and to such mixtures for use in or with liquid or solid ammoniacal nitrogen-containing fertilizers to reduce The use of small ammoniacal nitrogen to the extent of its nitrification when applied to the soil. More particularly, the present invention relates to such polymer mixtures, their metal salts or complexes, fertilizer products and methods wherein the selected polymer or polymer derivative is a substantially water-dispersible carboxylated copolymer , optimally a partial metal salt of a maleic-itaconic acid polymer. Background technique [0002] Plants have been fertilized with nitrogenous nutrients since the inception of organic farming. However, simply incorporating various nitrogenous components into the soil is inefficient and can be detrimental (eg the famous "fertilizer burn" phenomenon). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/80C05G3/90
CPCC05G3/08C05G3/0076C05G3/90C05G5/23Y02P60/21C05C3/00C05C9/00
Inventor 约翰·拉里·桑德斯G·马佐J·马佐
Owner VERDESIAN LIFE SCI
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