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Integrated management of Sesbania, Azolla and urea nitrogen in lowland rice under a rice–wheat cropping system

  • B. S. Mahapatra (a1) and G. L. Sharma (a1)

A two-year field experiment on a mollisol at Pantnagar showed that organic sources of N gave generally higher rice yields than the equivalent split dressing of prilled urea (PU). In 1985/86, Sesbania green manuring (40 kg N/ha) and PU (40 kg N/ha) and, in 1986/87, Sesbania (40 kg N/ha) + Azolla (40 kg N/ha) gave significantly higher yields than a split application of 80 kg N/ha as PU. Yield increases were attributed to significant variations in panicles/m2, filled spikelets/panicle and nitrogen uptake by the crop. These components, and grain yield, were significantly correlated with wet soil NH+4-N, which was increased by organic manuring. Wheat grown after each rice crop showed significant residual effects of the different sources of N applied to rice.

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A. Islam & A. Islam (1973). Chemistry of submerged soils and growth and yield of rice. I. Benefits from submergence. Plant and Soil 39, 555565.

M. L. Jackson (1973). Soil Chemical Analysis. New Delhi: Prentice Hall of India.

P. K. Singh , B. C. Panigrahi & K. B. Satapathy (1981). Comparative efficiency of Azolla, blue-green algae and other organic manures in relation to N and P availability of flooded rice soil. Plant and Soil 62, 3544.

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The Journal of Agricultural Science
  • ISSN: 0021-8596
  • EISSN: 1469-5146
  • URL: /core/journals/journal-of-agricultural-science
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