Volume No. 3 Issue No.: 1 Page No.: 82-90 July-Sept 2008

 

NITROGEN DINAMICS IN RICE AT DIFFERENT STAGES OF CROP GROWTH UNDER RICE-WHEAT CROPPING SYSTEM

 

Hrusikesh Patro*, S.C. Swain, S.C. Mohapatra1, Lingaraj Patro2, B.S. Mohapat

1. Krishi Vigyan Kendra, Gajapati, R. Udiyagiri 761016 Orissa, (INDIA)
2. Environmental Toxicology Lab, Department of Zoology and Biotechnology, K.B.D.A.V College, Nirakarpur-752019, Orissa, (INDIA)
3. Govind Ballav Pant University of Agriculture and Technology, Pantnagar, (INDIA)

 

Received on : September 14, 2007

 

ABSTRACT

 

A field experiment was conducted at Govind Ballav Pant University of Agriculture and Technology, Pantnagar (India) during 2000-01 and 2001-02 to evaluate the effect of four organic sources viz. Sesbania aculeata, Crotalaria juncea Vigna unguiculata and wheat straw along with 4 levels of N to rice (Oryza sativa L) and 3 levels of N to wheat (Triticum aestivum L), on wet soil ammoniacal N, soil available N and grain yield in rice at different stages of crop growth under rice wheat cropping system. Wet soil ammoniacal N, soil available N content declined with time and reached minimum at harvest during both the years. Sesbania green manure to rice recorded significantly higher soil ammoniacal N, soil available N and grain yield then any other organic sources applied to rice at all the stages of growth in both the years. Wet soil ammoniacal N, soil available N and grain yield increased significantly with increase in the level of nitrogen applied to rice even up to 180kg N ha-1 at all the stages of growth during both the years. Interactions between organic source and nitrogen level applied to rice were found significant at 60 and 90 DAT and at harvest during both the years as regards to all the three parameters under study.

 

Keywords : Sesbania aculeata, Crotalaria juncea, Vigna unguiculata, Oryza sativa, Nitrogen, Grain yield.

 

 

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