Effect of integrated nutrient management on active pools of soil organic matter under maize-wheat system of a typic haplustept
2009
Verm, G. | Mathur, A.K.
The effect of integrated nutrient management (INM) on active pools of soil organic matter (SOM) under maize-wheat cropping sequence of a Typic Haplustept was studied in a long-term field experiment initiated during kharif 1997 at the Instructional Farm of Rajasthan College of Agriculture, Udaipur. Effect of varying doses of N, NP, NPK with FYM, Zn, S and Azotobacter on active pools of SOM viz., soil microbial biomass carbon, nitrogen and phosphorus; water soluble carbon; water soluble carbohydrates and dehydrogenase activity after 9th year of maize-wheat crop rotation was studied. Application of FYM @ 20 t ha-1 significantly increased the microbial biomass carbon (SMB-C), water soluble carbon (WS-OC) and water soluble carbohydrates (WS-CHO), whereas maximum amount of soil microbial biomass nitrogen (SMB-N) and dehydrogenase activity (DHA) was found in 100; NPK + 10 t FYM ha-1 treatment and maximum soil microbial biomass phosphorus (SMB-P) was observed in 150; NPK treatment compared to sole use of chemical fertilizers. Integrated use of FYM with chemical fertilizers or use of FYM alone exerted significant effect on the active pools of soil carbon. The C/N ratio was highly and significantly correlated with soil microbial biomass carbon (SMB-C), soil microbial biomass nitrogen (SMB-N), water soluble carbon (WS-OC), water soluble carbohydrates (WS-CHO) and dehydrogenase activity (DHA) under maize crop.
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