ACTIVITIES OF HYDROLYTIC ENZYMES IN CARBON AND NITROGEN CYCLES IN HIGHLY FERTILE LUVISOL SANDY LOAM SOIL UNDER DIFFERENT LEVELS OF MINERAL NUTRITION
Abstract
As a result of determination of activities of hydrolytic enzymes of C and N cycles (cellulase, invertase, protease and urease) biochemical parameters of mineralization have been calculated under different levels of crop fertilization on highly fertile Luvisol sandy loam soil. Biochemical parameters of mineralization increase due to the application of FYM (60 t ha–1), its combination with PK-fertilizer (Р20K45 and Р40K90) as well as due to increasing doses of nitrogen (N60 and N60+30 for cereals, N90 and N90+30 for maize) and its combination with microelements (N60+30Cu50+Mn50 for cereals, N90+30Zn100 for maize) are presented. On the basis of the criteria of high and sustainable crop productivity as well as moderate level of mineralization in C and N cycles ecologically reasonable fertilizer treatments which ensure the maintenance of the reached level of fertility have been established.
About the Authors
V. V. LAPA
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
N. А. MIKHAILOVSKAYA
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
S. А. КАSYANCHIK
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
Е. G. МEZENTSEVA
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
О. G. КULESH
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
Т. V. POGIRNITSKAYA
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
Т. B. BARASHENKO
The Institute for Soil Science and Agrochemistry
Russian Federation
Russian Federation
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