1H-PYRAZOL-DERIVATE, VERFAHREN ZU IHRER HERSTELLUNG UND DEREN VERWENDUNG ZUR HEMMUNG UND STEUERUNG DER NITRIFIKATION

The invention concerns the use of hydrophobic, thermostable and not easily volatile 1H pyrazole derivatives of general formula (I) and to their acid addition products as agents for inhibiting or controlling nitrification, wherein R and R independently represent H or a C1-C4-alkyl radical; R represents H, halogen or a C1-C4-alkyl radical or R and R together represent a five or six-membered cycloalkyl radical; R represents C1-C20-alkyl, C3-C8-cycloalkyl, C6-C10-aryl or alkylaryl with C1-C4-alkyl and C6-C10-aryl groups and R represents H, C1-C20-alkyl, C3-C8-cycloalkyl, C6-C10-aryl or alkylaryl with C1-C4-alkyl and C6-C10-aryl groups, whereby radicals R and R may be substituted, for example, by halogen, hydroxyl, by a trimethylsilyl, amino, nitro, cyano, carbonyl, carboxyl or a carboxyalkyl group having 1 to 5 C atoms. The invention also concerns novel pyrazole derivatives of formula (I), wherein R represents a C1-C4-alkyl radical; R = H, halogen or a C1-C4-alkyl radical; R and R together represent a five or six-membered cycloalkyl radical; R = H, R = C1-C20-alkyl, C3-C8-cycloalkyl; C6-C10-aryl or alkylaryl with C1-C4-alkyl and C6-C10-aryl groups and R = H, C1-C20-alkyl, C3-C8-cycloalkyl, C6-C10-aryl or alkylaryl with C1-C4-alkyl and C6-C10-aryl groups.