Impact of Long Term Fertilization on Soil Phosphorous Availability in the Rhizosphere of Rice Grown in Acid Inceptisols
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Authors
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DEBASIS PUROHIT
AICRP on LTFE, Dept. of Soil Science and Agricultural Chemistry, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha - 751 003, India
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MITALI MANDAL
AICRP on LTFE, Dept. of Soil Science and Agricultural Chemistry, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha - 751 003, India
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AVISEK DASH
AICRP on LTFE, Dept. of Soil Science and Agricultural Chemistry, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha - 751 003, India
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KUMBHA KARNA ROUT
AICRP on LTFE, Dept. of Soil Science and Agricultural Chemistry, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha - 751 003, India
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NARAYAN PANDA
Dept. of Soil Science and Agricultural Chemistry, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha - 751 003, India
Keywords:
Long-term fertilization, Phosphorous, Rhizosphere, RiceAbstract
The chemical and biological processes in the rhizosphere not only determine mobilization and acquisition of soil nutrients as well as microbial dynamics, but also control nutrient-use efficiency of crops and thus profoundly influence crop productivity. Thus, an attempt was made to investigate the relative effects of rhizosphere and non - rhizosphere on the soil phosphorous availability in a rice-rice cropping system during post kharif - 2015 in flooded tropical rice (Oryza sativa L.) under long term fertilizer experiment (LTFE) started in the year 2005-06 in the central farm of Orissa University of Agriculture and Technology (OUAT) under All India Co-ordinated Research Project (AICRP) in an acidic sandy soil. The experiment was laid out in a randomized block design with quadruplicated treatments. Soil samples at different growth stages of rice were collected from LTFE. The studied long-term manured treatments included 100% N, 100% NP, 100% NPK, 150% NPK and 100% NPK+FYM (5 t ha-1) and an un-manured control. The pH was lower in rhizosphere soil as compared to non- rhizosphere soil in all the three stages of crop growth. Soil fertility status parameters like soil organic carbon (SOC) content and available - P content and microbial biomass phosphorous (MBP) decreased continuously during the crop growth period. Among the fertilized treatments, 100% NPK + FYM exhibited highest nutrient content at maximum tillering stage in both the soils, being recorded highest in rhizosphere soil. The enhanced SOC in rhizosphere soil coupled with high MBP resulted in increased rate of soil – P solubilization. Long term application of balanced and integrated use of fertilizers and organic manure is desirable in order to improve nutrient availability in soil and crop yield. Rhizosphere played a positive role in the nutritional ecology of rice- rice cropping system.
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