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Use of a cation source to prevent decomposition of (thio)phosphoric acid triamide urease inhibitors when a phosphorus-containing fertilizer is present

IP.com Disclosure Number: IPCOM000248072D
Publication Date: 2016-Oct-24

Publishing Venue

The IP.com Prior Art Database

Related People

BASF SE: OWNER [+6]

Abstract

The present invention relates to the use of a cation source (1) to prevent decomposition of a (thio)phosphoric acid triamide (2); to a method for preventing decomposition of a (thio)phosphoric acid triamide (2) by adding a cation source (1); to a mixture M comprising a cation source (1) and a (thio)phosphoric acidtriamide (2); to a granule G comprising a fertilizer (3a) and/or a P-containing fertilizer (3b), wherein the granule is coated with a cation source (1); and to a composition B comprising a (thio)phosphoric acid triamide (2), a fertilizer mixture (3), and a cation source (1), wherein the composition B is obtainable by specific processes.

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BASF SE

160207EP02

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Use of a cation source to prevent decomposition of (thio)phosphoric acid triamide urease inhibitors when a phosphorus-containing fertilizer is present

Description

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 The present invention relates to the use of a cation source (1) to prevent decomposition of a (thio)phos- phoric acid triamide (2); to a method for preventing decomposition of a (thio)phosphoric acid triamide (2) by adding a cation source (1); to a mixture M comprising a cation source (1) and a (thio)phosphoric acid triamide (2); to a granule G comprising a fertilizer (3a) and/or a P-containing fertilizer (3b), wherein the granule is coated with a cation source (1); and to a composition B comprising a (thio)phosphoric acid tri-

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amide (2), a fertilizer mixture (3), and a cation source (1), wherein the composition B is obtainable by spe- cific processes.

 Worldwide, the predominant and further-increasing amount of the nitrogen used for fertilizing is em- ployed in the form of urea or urea-containing fertilizers. Urea itself, however, is a form of nitrogen which is

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absorbed very little if at all, being hydrolyzed relatively rapidly by the enzyme urease, which is present ubiquitously in the soil, to form ammonia and carbon dioxide. In this process, in certain circumstances, gaseous ammonia is emitted to the atmosphere, and is then no longer available in the soil for the plants, thereby lowering the efficiency of fertilization.

It is known that the degree of utilization of the nitrogen when using urea-containing fertilizers can be im-

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proved by spreading urea-containing fertilizers together with substances which are able to inhibit or de- crease the enzymatic cleavage of urea (for a general review, see Kiss, S. Simihaian, M. (2002) Improving Efficiency of Urea Fertilizers by Inhibition of Soil Urease Activity, ISBN 1-4020-0493-1, Kluwer Academic Publishers, Dordrecht, The Netherlands).

Among the most potent known urease inhibitors are N-alkylthiophosphoric acid triamides and N-alkyl-

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phosphoric acid triamides, which are described in EP 0 119 487, for example.

 Additionally, mixtures of N-alkylthiophosphoric acid triamides such as N-(n-butyl)thiophosphoric acid tri- amide (NBPT) and N-(n-propyl)thiophosphoric acid triamide (NPPT) can be used. The mixtures and their preparation are described in US 2010/218575 A1, for example.

These urease inhibitors are described in U.S. Pat. No. 4,530,714, for example. In order for this class of

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compound to be able to act as a urease inhibitor, there must first be a conversion to the corresponding oxo form. That form reacts subsequently with the urease, causing its inhibition.

 It is advisable to apply the urease inhibitors together with the urea onto or into the soil, since this en- sures that the inhibitor comes into contact, together with the fertilizer, with the soil. The urease inhibitor

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may be incorporated in the urea by, for example, dissolving it into the melt prior to urea granulation or pril- l...