INFLUENCE OF LONG TERM FERTILIZATION ON YIELD AND ACTIVE POOLS OF SOIL ORGANIC CARBON IN RICE - RICE CROPPING SEQUENCE OF ONATTUKARA
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Authors
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G. KAVYASREE and V. MINI
Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, Thiruvananthapuram - 695 522
Keywords:
Integrated Nutrient Management, Soil Organic CarbonAbstract
The effect of long term fertilization on yield and active pools of soil organic carbon under ricerice
cropping sequence was studied during 2020-21 in a long term fertilization experiment conducted
since 1964 at Onattukara Regional Agricultural Research Station, Kayamkulam, Kerala. The results
indicated that the application of FYM along with NPK fertilizers(80 kg N ha-1, 20 kg as FYM and 60 kg
as A.S. + 40 kg P2O5 ha-1 as Rajphos + 40 kg K2O ha-1) as MOP resulted in significant increase in rice
yield. Soil organic carbon, soil microbial biomass carbon, nitrogen, and phosphorus, water soluble
carbon, water soluble carbohydrates and dehydrogenase activity were the highest under treatment
receiving combined application of FYM and NPK fertilizers. These fractions contribute to the active
pool of soil organic carbon and can be identified as an indicator of soil quality. Present study thus
provided an insight on how management practices affect crop yield and active pools of carbon.
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