Yield and nitrogen uptake by rice (1980)

In Asia, rice is mainly grown as a transplanted crop and a number of workers have reported higher yields with transplanting than with direct seeding. However, increasing labour wages and management problems are forcing many rice growers to switch to direct  seeding. The demand for appropriate agronomic technology for this method of planting is increasing, particularly in northwestern India, where rice is becoming the most important rainy season (July to October) cereal preceding the winter season (November to April) wheat crop. Sanchez observed that puddling was not necessary and rice could be grown well on granulated soil. Also, the  farmers in this region demand an early maturing variety, which will give them sufficient time to get their fields ready for sowing wheat. Efficiency of fertilizer nitrogen in rice is reported to be only 30-40% or even less due to heavy losses through ammonia volatilization, leaching and denitrification. The loss of nitrogen is higher under alternate flooding and drying. In view of this, there has been considerable interest in developing and evaluating new nitrogen fertilizers for rice. Of these materials, sulphur-coated urea and urea briquettes/super granules have been found to be most promising. Also, Prasad and co-workers have shown that coating of urea with neem (Azadirachta indica Juss.) cake, an indigenous low cost material, increases the efficiency of fertilizer nitrogen applied to rice. The present investigation was therefore conducted to study the effects of duration of variety, method of planting and source of nitrogen on yield and nitrogen uptake by the rice crop.

(Nutrient Cycling in Agroecosystems, 1980)

Nutrient Cycling in Agroecosystems


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