Azolla as an organic source of nitrogen in a rice-wheat cropping system

Authors

  • S.S. Khole Agricultural Engineering Department, Indian Institute of Technology, Kharagpur 721 302, India
  • B.N. Mittra Agricultural Engineering Department, Indian Institute of Technology, Kharagpur 721 302, India

Keywords:

Azolla, Organic source, Cropping system, Incorporation, Rice, Wheat

Abstract

A field experiment was carried out at the Agricultural Engineering Department, Indian Institute of Technology, Kharagpur, for three consecutive years, 1979-1982, to evaluate the use of azolla to meet at least a part of the N requirement of a rice-wheat cropping system. Preplanting incorporation of azolla proved to be superior to postplanting. Fresh azolla at the rate of 10 t ha-1 + 30 kg N ha-1 as urea was found to be the best treatment and recorded maximum grain yield of rice as well as maximum residual effect on wheat. The results indicated that azolla could be utilized as a substitute to N-fertilizer; about 30 kg N could be supplemented through preplanting incorporation of 5 t fresh azolla.

How to Cite

Khole, S., & Mittra, B. (1990). Azolla as an organic source of nitrogen in a rice-wheat cropping system. Tropical Agriculture, 67(3). Retrieved from https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/1789

Issue

Section

Research Papers