DD217693A1 - MEANS OF INHIBITING NITRIFICATION - Google Patents

Abstract

The invention relates to agents for inhibiting the nitrification of ammonium nitrogen in Kultursoeden. As active ingredient they contain v-haloacetophenes of the general formula in which R 1 is hydrogen, chlorine, bromine, nitro or alkyl, R 2, R 3, R 4 is hydrogen, chlorine or bromine and n is 1, 2 or 3. formula

Description

VEBOHBMIBKQMBINAiDBITTERPEIiD

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Agent for inhibiting nitrification

Field of application of the invention

The invention relates to compositions for inhibiting the nitrification of ammonium nitrogen, in particular from mineral and organic fertilizers, in cultivated soils.

Characteristic of the known technical solutions

Ammonium nitrogen is known to undergo microbial conversion via the intermediate nitrite nitrogen to nitrate nitrogen in the soil in a relatively short time. This nitrification process will

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"Nitrate nitrogen, in contrast to ammonium nitrogen, is easily sorbed by the sorption carriers of the soil, clay and humus." The consequence of this is that nitrate nitrogen occurs during the winter half-year and in the case of heavy precipitation or »intensive irrigation even during the summer half-year, especially on light soils subject to leaching. The leaching losses can average up to 20 % of the fertilizer nitrogen · The washed out nitrogen is known not only for the nutrition of the crops lost, but it also comes to the enrichment of nitrate nitrogen in groundwater. This can lead to damage to human and animal health in connection with the drinking water supply "In addition to the leaching losses, considerable gaseous nitrogen losses occur annually through denitrification of the nitrate nitrogen ·

The inhibition or regulation of the nitrification can decisively improve the utilization of the fertilizer nitrogen and thus increase the economic benefit of nitrogen fertilization.

It is known that, for these purposes, hydrochloric acid, 3,5-dimethyltetrahydro-i, 3,5-thiadiazine-2-thione, 2-chloro-6-trichloromethylpyridine, pentachlorophenol, 2-amino-4'-chloro 6-methylpyrimidine and other compounds can be used. (DD-PS 107 664, JP-PS 2737/68). However, these compounds have certain disadvantages such. B _e to low efficacy, high toxicity, expensive manufacturing method and high volatility, which oppose an application ·

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Object of the invention

The aim of the invention is to develop active substances for inhibiting or regulating the nitrification of ammonium nitrogen in the soil, which are easy to prepare, have a sufficient residual action and permit surface application.

Explanation of the essence of the invention

This task is inventively achieved in that the means for inhibiting the nitrification of ammonium nitrogen in culture soils in addition to conventional excipients and carriers as the active compound compounds of the general formula

in which R ₁ «is hydrogen, chlorine, bromine, nitro, alkyl R ₂ , R ~, R- = hydrogen, chlorine or bromine and η« 1, 2 or 3, respectively.

Some of the agents according to the invention inhibit the nitrification of ammonium nitrogen considerably more than dichloroaluminum or 3,5-dimethyltetrahydro-1,3,5-thiadiazin-2-thione (Dazomet).

The active compounds can be prepared in a manner known per se by halogenation of acetophenones (DE-AS 1 223 824, DE-OS 2 147 527).

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The erfindungsgemäßeri compositions may be in the form of a solid or liquid concentrate 2 "B come in water or in a mixture with a solid, vermählenen or granular carrier au application they ι ₀ can in admixture with solid and / or liquid mineral or organic fertilizers containing urea and The agents according to the invention are expediently shortly before or simultaneously with or shortly after the application of the fertilizer at a rate of from 0.5 to 200 kg of active ingredient / ha, preferably from 1.0 to 60 kg / ha, applied "If one applies them with a solid or liquid fertilizers as they can with 2 to 40 wt _e ~ be applied% of Düagemittelstickstoffs"

The compositions according to the invention are added to a black earth-like sandy loam soil as urea mixture and uniformly mixed with it. The concentration is 16 ppm (based on soil mass) at a nitrogen release of 20 mg H / 100 g soil after moistening the soil 50% of the maximum water capacity was incubated at 20 ⁰ C 28 days and thereafter, the nitrates formed or litritstickstoff determined "as a control, the same addition of urea was used to ground as in the test variants. The percent inhibition was calculated according to the formula _s

a '- b

a ^ T "^ ^# 100 ss % inhibition

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a = nitrite vend. Nitrate content of the control

b * Nitrite and nitrate content of the samples with active substance

c β nitrite and nitrate content of the soil used The results are summarized in the table.

T a be 1 1 e

Inhibition of the nitrification of ammonium nitrogen by the agents V according to the invention

Link R ¹ 0 R ² R ³ R ⁴ .. * inhibition No. 4-CH ₃ -C-NH 1 4,5-Cl 4-Cl, 5-NO ₂ Cl H H 21 4-01.5-NO ₂ 2 4,5-Cl, 2-NO ₂ Cl H H 13 3 ' 4-Cl, 5-N0 ₂ br H H 33 4 4,5-Cl Cl Cl H 52 5 '' - 4,5-Cl, 2-NO ₂ Cl Cl H 19 4,5-Cl Cl br H 17 7 4-NO ₂ Cl br H 21 8th 3-Cl Cl br H 17 9th 3-Br " br br H 14 10 '. 3-NO ₂ br br H 20 11 4-Cl, 5-NO ₂ br br H '40 12 4-Br, 5-NO ₂ br br H 16 13 H . , br br H 26 · 14 2,5-Cl, -3-NO ₂ br br H 38 15 4-C1 br br H 36 16 4-NO ₂ Cl Cl Cl 86 17 H . Cl Cl Cl 70 18 Cl Cl gl 76 19 - Cl Cl Cl 100 20 br br br 98 Dichloral- urea 31 Daaomet 18

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From the table it can be seen that the inhibition of the nitrification of ammonium nitrogen by the agents according to the invention in relation to the comparative products Dazomet and Dichioralharnstoff is equally good and Zo T, much better * Here are especially the compounds 4 »1.6.» 17 »18, 19 and 20 highlight. , '.

Claims (1)

- 7 - 2332 Erfindufiffsanspruch 1. A means for inhibiting the Hitrifikation of ammonium nitrogen in cultivated soils, characterized in that they in addition to customary auxiliaries and 'carriers' as the active ingredient "compounds of the general formula ·: '='':Ο' R ² '''. : ''' rt 1
in which R 'is hydrogen, chlorine, bromine, nitro or alkyl, R ₂ , Rt, R - hydrogen, chlorine or bromine and η = 1, 2 or 3, respectively. Use of the means according to the invention, characterized in that they are in the form of a solid or liquid concentrate alone or in admixture with solid and / or liquid mineral or organic fertilizers containing urea <and / or ammonia and / or ammonium nitrogen, are used.