Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1999-09-24
2000-10-31
Dunn, Tom
Chemistry: fertilizers
Processes and products
Organic material-containing
5483731, 71902, C05C 900, C07D23110
Patent
active
06139596&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the use of inorganic or organic polyacids for the treatment of inorganic fertilizers.
In particular, the invention relates to the use of polyacids as a mixture with at least one nitrification inhibitor for the treatment of inorganic fertilizers, the use of selected pyrazole derivatives as nitrification inhibitor in inorganic fertilizers, and as stabilizers of liquid manure or liquid fertilizer formulations, and the corresponding treated inorganic fertilizers per se. Moreover, the present invention relates to pyrazole derivatives which can be used as nitrification inhibitors in inorganic fertilizers, and as stabilizers of liquid manure or liquid fertilizer formulations.
In order to make available to plants in agriculture the nitrogen needed by them, ammonium compounds are mainly employed as fertilizers.
Ammonium compounds are converted microbially to nitrates in the soil in a relatively short time (nitrification). Nitrates, however, can be washed out of the soil. The portion washed out is in this case no longer available for plant nutrition, so that for this reason rapid nitrification is undesirable. For better utilization of the fertilizer, nitrification inhibitors are therefore added to the fertilizer. A known group of nitrification inhibitors are pyrazole compounds.
A problem in the use of pyrazole compounds as nitrification inhibitors is their high volatility. During the storage of fertilizer preparations containing pyrazole compounds, a continuous loss of active compound occurs due to evaporation. The pyrazole compounds must therefore be formulated in a nonvolatile form by means of suitable measures.
To fix the pyrazole compounds, these were converted, for example, into transition metal complexes such as zinc complexes. This is described, for example, in U.S. Pat. No. 4,522,642. The volatility of the active compounds can thus be reduced. For environmental protection reasons, the widespread application of zinc, copper or manganese to the soil is, however, undesirable. Complexes of alkali metals or alkaline earth metals which are environmentally tolerable, are not adequately stable, however, and hydrolyze in the aqueous environment.
It has furthermore been attempted by neutralization of the pyrazole compounds with mineral acids, such as phosphoric acid or hydrochloric acid, to decrease their volatility. DE-A-4 128 828 describes the use of nitrates and phosphates of 3-methylpyrazole for the coating of fertilizers. U.S. Pat. No. 3,635,690 also describes the stabilization of pyrazole derivatives by mineral acids, such as hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid. These acidic salts of the pyrazole compounds, however, are increasingly susceptible to hydrolysis and for this reason cannot be employed for all applications.
DE-A4 128 828 further describes the sealing of the coated fertilizer with wax or oil. In the case of hygroscopic active compound salts, however, this process does not lead to a satisfactory resistance to hydrolysis.
Formulations of pyrazoles with polymeric auxiliaries have furthermore been employed. Thus DE 260 486 describes formulations of pyrazoles in urea-formaldehyde condensates. The incorporation of the active compounds into the polymer matrix, however, suppresses the mobility of the active compounds in the soil. In this application form, therefore, the finely divided formulation and fertilizer must be thoroughly mixed with the soil to be fertilized. Otherwise the nitrification inhibitor remains on the surface of the earth with the polymer matrix. The need to mix formulation, fertilizer and soil, however, is laborious.
It is an object of the present invention to provide inorganic fertilizers which contain a nitrification inhibitor whose content does not significantly change during storage and application of the fertilizer, and which remains in the ground after application of the fertilizer and can display its action there. Furthermore, new nitrification inhibitors shall be provided.
We have found that this object is achieved by use of inor
REFERENCES:
patent: 3635690 (1972-01-01), Griffith
patent: 4522642 (1985-06-01), Arndt et al.
patent: 4523940 (1985-06-01), Arndt et al.
patent: 4975107 (1990-12-01), Arndt et al.
patent: 5174806 (1992-12-01), Masuda
patent: 5482529 (1996-01-01), Ahlnas et al.
Chem. Abst., 112 (13), AN117849f.
Chem. Abst., 113 (17), AN151358a.
Chem. Abst., 118 (15), AN146794p.
Barth Thomas
Dressel Jurgen
Erhardt Klaus
Gold Randall Evan
Leibold Edgar
BASF - Aktiengesellschaft
Dunn Tom
Warn Elin A
LandOfFree
Nitrification inhibitors and the use of polyacids to treat miner does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Nitrification inhibitors and the use of polyacids to treat miner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nitrification inhibitors and the use of polyacids to treat miner will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2046279