Influence of inorganic fertilizers and organic amendments on soil organic matter and soil microbial properties under tropical conditions |
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| Authors: | Sneh Goyal K Chander M C Mundra K K Kapoor |
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| Institution: | (1) Department of Microbiology, CCS Haryana Agricultural University, Hisar-125 004, India e-mail: hau@hau.ren.nic.in; Tel.: +91-1662-31171 Ext 4292, Fax: +91-1662-34952, IN;(2) Department of Agronomy, CCS Haryana Agricultural University, Hisar-125 004, India, IN |
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| Abstract: | Soil organic matter level, mineralizable C and N, microbial biomass C and dehydrogenase, urease and alkaline phosphatase
activities were studied in soils from a field experiment under a pearl millet-wheat cropping sequence receiving inorganic
fertilizers and a combination of inorganic fertilizers and organic amendments for the last 11 years. The amounts of soil organic
matter and mineralizable C and N increased with the application of inorganic fertilizers. However, there were greater increases
of these parameters when farmyard manure, wheat straw or Sesbania bispinosa green manure was applied along with inorganic fertilizers. Microbial biomass C increased from 147 mg kg–1 soil in unfertilized soil to 423 mg kg–1 soil in soil amended with wheat straw and inorganic fertilizers. The urease and alkaline phosphatase activities of soils
increased significantly with a combination of inorganic fertilizers and organic amendments. The results indicate that soil
organic matter level and soil microbial activities, vital for the nutrient turnover and long-term productivity of the soil,
are enhanced by use of organic amendments along with inorganic fertilizers.
Received: 6 May 1998 |
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| Keywords: | Soil organic matter Microbial biomass Soil enzymes Organic amendments Inorganic fertilizers |
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