Author(s): LUNGMUANA, M. GHOSH AND P. K. PATRA

Abstract: A field experiment was conducted during 2007 kharif season in a farmer\'s field in the Red and Laterite zone of West Bengal to evaluate the effect of integrated use of fertilizer with organic amendments viz., rice straw, glyricidia leaves, farm yard manure and vermicompost, on transformation of phosphorus in the rice rhizosphere soil in relation to growth and yield of rice (cv. IR-36). Rhizosphere soil and plant samples collected from rice field during tillering, flowering and harvesting stages of rice were analyzed. Chemical fertilizers and vermicompost furnished the highest amount of available phosphorus in the rhizosphere and produced the highest rice grain yield. These parameters were found to be significantly and positively correlated. Simple regression analyses revealed that about 90% (R2=0.90**) of the variability in grain yield could be explained by the variability in available phosphorus. This experiment clearly brought out the beneficial role of organic amendment on the availability of phosphorus to rice crop particularly at the later stage of growth.

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