The present study investigated variations among different water and fertilizer levels of aerobic rice. The data collected to assess the source-sink relationship of aerobic rice were leaf number, individual leaf size, soluble protein content and leaf area duration expressed as source strength and moreover sink strength expressed using spikelet number, thousand grain weight, grain filling duration and grain filling rate. The higher sink strength and optimum source strength was recorded in 125% pan evaporation (PE) with 100% recommended doses of fertilizers (RDF) treatment. Besides, higher sink-source ratio and lower source limitation was a reason for the balanced source and sink strength observed and also recorded higher grain yield. The treatments receiving 100% PE and 75% RDF level showed considerable reduction in the grain yield through source sink related characters.
Key words: Aerobic rice, drip fertigation, source strength, sink strength, grain filling rate.
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