Effect of organic and inorganic sources of nitrogen on productivity of rice in rice-fish farming system

Abstract

A field experiment was conducted at the research farm of the Water Technology Centre for Eastern Region (Indian Council of Agricultural Research), Bhubaneswar, India, to study the effect of organic and inorganic sources of nitrogen fertilizer on nutrient use efficiency and productivity of rice and rice-fish farming systems. With the increase in inorganic sources of nitrogen, the rice crop responded positively in terms of grain yield and other yield attributes. The highest grain yield, straw yield, panicles and filled grains panicle⁻¹ of rice were recorded when nitrogen was supplied in 100% through inorganic form. Similarly, the agronomic efficiency and apparent recovery were found to be at a maximum when nitrogen was supplied in 100% inorganic form. The productivity of rice was however found to be higher when fish was integrated into the system.

Keywords:

• organic source
• inorganic source
• nitrogen
• rice
• rice-fish farming system

Acknowledgements

The authors are grateful to the Director, Water Technology Centre for Eastern Region (Indian Council of Agricultural Research) for providing facilities for laboratory analysis.