Abstract
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.
Highlights
Rice is an important food crop for a large proportion of the world’s population
Summarizing the influence of drip fertigation system on sink characteristics in aerobic rice, it could be inferred that the yield variations observed under varied water as well as fertigation levels could be mainly due to the alterations in sink capacity and its activity
The major component of sink activity, viz., grain filling rate was greatly influenced by water and fertilizer levels
Summary
Rice is an important food crop for a large proportion of the world’s population. It is staple food in the diet of the population of Asia. Rice provides 35 to 60% of the dietary calories consumed by nearly more than 3 billion people (Fageria et al, 2003). It is the second most cultivated cereal after wheat. Increases in rice production will have to come from the same or an even less amount of land. This means appropriate rice production practices should be adopted to improve rice yield per unit area (Fageria, 2007)
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