DD292232A5 - MEANS FOR INHIBITION BZW. REGULATION OF NITRIFICATION OF AMMONIUM NITROGEN IN CULTURED BODIES - Google Patents

Abstract

The invention relates to a means for inhibiting or regulating the nitrification of ammonium nitrogen in Kultursoeden. The agent contains as active ingredient 1-guanyl-3-methylpyrazole, its acid addition products or coordination compounds. {Inhibition; Regulation; nitrification; Auxiliaries and carriers; 1-guanyl-3-methylpyrazole; Saeureadditionsprodukte; Coordination compounds}

Description

Field of application of the invention

The invention relates to the prevention or control of the nitrification of ammonium nitrogen, in particular from mineral and organic fertilizers, in cultivated soils.

Characteristic of the known state of the art

Ammonium nitrogen is subject in the ground in a relatively short time of microwave conversion via the intermediate of nitrite nitrogen to nitrate nitrogen. This process is significantly influenced by the temperature, soil moisture, pH and soil biological activity.

Nitrate nitrogen, in contrast to ammonium nitrogen, is not sorbed by the sorption carriers of the soil, clay and humus. The consequence of this is that nitrate nitrogen during the winter half-year and in heavy rainfall or intensive irrigation also during the summer half-year, especially on light soils, the leaching is subject. The leaching losses can average up to 20% of the fertilizer nitrogen per year.

The washed out nitrogen is not only lost for the nutrition of the crop plants, but also leads to the enrichment of nitrate nitrogen in the groundwater. In connection with drinking water supply, this can lead to damage to human and animal health.

In addition to the Auswaschverlustcn under certain conditions, especially in high humidity or soil compaction, annually significant gaseous Stickstoffveiluste by denitrification of nitrate nitrogen occur. By inhibiting or regulating the nitrification, the utilization of the fertilizer stick can be decisively improved and thus the economic benefit of nitrogen fertilization can be increased.

It is already known that for these purposes, in addition to substituted pyrazoles (US Pat. No. 3,494,757, JP Pat. No. 7,247,187, DD Pat. No. 131,063, DD Pat. No. 133,088) and their azolium salts (US Pat. No. 3,635,690, JP Pat. No. 7,247,182, JP-A PS 72-47183), substances such as dicyandiamide (DOS 2702284, DOS 2714601, DOS 354482), nitrapyrin (US-PS 3424754, SU-PS 1085966) and guanylthioureas and their salts (JP-PS 5852/59, JP-PS 56002958) can be used.

However, these compounds have disadvantages such as low efficacy, too low thermal and hydrolytic stability, too high toxicity, too high volatility and elaborate production processes that preclude economic application.

Too high volatility and low thermal and hydrolytic stability of the active ingredients limit the application process very much and allow only a contribution to the soil.

Object of the invention

The aim of the invention is to provide active substances for inhibiting or regulating the nitrification of ammonium nitrogen in the soil, which have a sufficient residual action and which, due to their low volatility, permit all application processes, in particular surface application.

Explanation of the essence of the invention

It has surprisingly been found that 1-guanyl-3-methyl-pyrazole (GMP) according to formula I,

PL ¹

-CH ₃

C = NH I

whose acid addition products or coordination compound inhibit the nitrification of ammonium nitrogen or

regulate.

Table 1 gives an overview of some substances.

Table 1

No. of the structure M.p. ( ⁰ C) Metal% gef. connection calc. 1 GMP 105-108 _ - 2 GMP HCI 150-153 - 24.22 3 Cu (GMP) Cl ₂ 261-262 24.57 16.35 4 Cu (GMP), CLJ 250-252 16.60 16.58 B Zn (GMP) ₁ CI ₂ 178-180 17.0 14.25 6 Ni (GMP) ₂ CI ₂ -2H ₂ O 200 (Z) 14.18

The compositions of the invention have the advantage oinor very low volatility, causing low drug losses occur in Oberf IMchenapplikation. In addition, the compositions according to the invention are characterized by a high thermal and hydrolytic stability, which allows incorporation into the fertilizer and circumvents previous mixing processes or separate application of active ingredient and fertilizer.

The compositions of the invention may have been applied in admixture with or together with solid or liquid mineral or organic fertilizers containing the nitrogen in reduced form. They may also be melted in solid mineral ammonium fertilizers and in the form of a solid or liquid concentrate, e.g. in water or in admixture with a solid, ground or granulated carrier. When used together with solid or liquid fertilizers, the new agents can be used with 0.1-50% by weight of the fertilizer nitrogen, preferably with 0.2-15% by weight. The following examples serve to illustrate the invention.

embodiments

example 1

The compositions according to the invention were added as ammonium sulfate active substance mixtures to a black earth-like sandy loam soil and mixed uniformly.

The concentration was 16ppm (based on soil mass) with a nitrogen load of 20mg N / 100g soil.

After humidifying the soil to 50% of the maximum water capacity was incubated at 2O ⁰ C 28 days and then the educated.-nitrate or nitrite nitrogen determined. The same ammonium sulfate addition to the bottom served as control as in the test variants.

The percentage inhibition is calculated according to:

a - b

· 100 =% inhibition

a - c

a - nitrite and nitrate content of the control b = nitrite and nitrate content of the active substance samples c - nitrite and nitrate content of the soil used

 The results are shown in Table 1.

Table 1: Percent inhibition of nitrification after 28 days of incubation

Mean% inhibition after 28 days

1 100

2 100

1 = i-guanyl-3-methylpyrazole

2 = i-guanyl-3-methylpyrazole hydrochloride

Example 2

The compositions according to the invention were added as a mixture of urea active substance to a black earth-like sandy loam soil and uniformly mixed.

The concentrations were 4.2 and 1 ppm (based on soil mass) with a nitrogen load of 20 mg N / 100g soil.

After humidifying the soil to 50% of the maximum water capacity was incubated at 20 ° C and determined at intervals of 14 days nitrate and nitrite nitrogen. The same urea addition to the bottom served as a control as in the test variant.

The calculation of the inhibition was carried out analogously to Example 1.

The results are shown in Table 2.

Table 2 Conc. (Ppm) % Inhibition by days 28 42 56 70 medium 14 100 100 92 56 4 100 100 95 81 23 1 2 100 100 95 76 26 1 100 100 100 95 56 4 100 100 100 86 51 2 2 100 98 71 42 12 1 100

medium

Conc.

ppm

(Complex)

proportion of

ppm

(Fascinating country)

% Inhibition by days

28

42

56

0.5 0.24 67 0 89 1.0 0.48 90 s 11 2.0 0.96 100 100 31 0.5 0.32 79 3 89 1.0 0.65 100 80 2.0 1.30 100 91 20 0.5 0.32 88 0 94 1.0 0.65 97 60 2.0 1.29 100 97 14 O,: 0.3 69 0 87 1.0 0.6 97 71 2.0 1.2 100 94

57

69

63

Example 3

3 mg of the agents according to the invention were superficially applied to 10 g of a sand-rodeo which was at 10% of the maximum

Water capacity was set, abandoned. A master dish containing 4 mg of 0.1 η H ₂ SO ₄ was used as an adsorption vessel in which the volatile active substance losses were adsorbed. The whole was incubated in a glass vessel with a blanket at 2O ⁰ C and determined the active ingredient content at the appropriate Probenhemetagen UV spectroscopy. As a comparison served 3 mg superficially

applied 3-methylpyrazole.

The advantage over 3-methylpyrazole is shown in Table 3.

Table 3: Volatility in a sand ridge

medium

% Drug losses after days 7 17 21

1 2 3-MP

0.9 11.8

1.2

1.8

22.0

Example 4

1.25 mg of the agent according to the invention was dissolved in 100 ml of 0.1 η H ₂ SO ₄ and the active substance content was determined by UV spectroscopy over time. The results of the drug stability in dilute sulfuric acid are shown in Table 4.

Table 4: Hydroxyl stability in dil. H ₂ SO ₄ ·

medium

Active substance content (mg) after weeks 0 4 12

1.25

1.25

1.23

18

26

1.15

1.12

Example 5

The compositions according to the invention were used as urea active ingredient melts (2% and 4% active ingredient in the melt)

added to a blackish-like sandy loam soil and mixed evenly.

The concentrations were 4.2 and 1 ppm of active ingredient (based on soil mass) with supplemental nitrogen addition of

20mg N / 100g soil.

After wetting the soil to 50% of the maximum water capacity C was incubated and determined at intervals of 14 days nitrate and nitrite nitrogen at 2O ^0th The same urea addition to the bottom served as control as in the test variants. The

Calculation of the inhibition was carried out analogously to Example 1.

Table 5: Melting in urea with 2% active ingredient content

medium Conc. (Ppm) % Inhibition by days 28 % Inhibition by days 28 42 66 70 14 99 14 99 92 79 34 2 4 100 99 100 99 88 61 19 2 100 74 100 94 3 1 100 Melting in urea with 4% active ingredient content 100 Table 6: Conc. (Ppm) medium 42 56 70 4 91 69 10 2 2 92 69 8th 1 30

Claims (1)

An agent for inhibiting or regulating the nitrification of ammonium nitrogen, which comprises, in addition to customary excipients and carriers, as active ingredient 1-guanyl-3-methylpyrazole corresponding to formula I ₁ rrCH, Il C = NH
NH ₂ whose acid addition products or coordination compounds contain bonds.