Volume No. 3 Issue No.: 4 Page No.: 1081-1087 April-June 2009

 

EFFECT OF ORGANIC SOURCE OF NUTRIENTS WITH DIFFERENT LEVELS OF NITROGEN IN SOIL UNDER RICE-WHEAT CROPING SYSTEM

 

Hrusikesh Patro*, S.C. Swain

1. Krushi 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, 263145 Utaranchal (INDIA)

 

Received on : March 25, 2009

 

ABSTRACT

 

A field experiment was conducted during 2000-2001 and 2001-2002 to evaluate the effect of 5 organic sources of nutrients with 4 levels of N to rice and 3 levels of N to wheat on balance of total N and organic matter as well as available N, P and K content of soil in rice-wheat system. The change in organic matter and total soil nitrogen over a period of two years of cropping cycle in 0-20 and 20-40 cm soil depth was only marginal, however, the values were higher in green manured plots. Nitrogen fertilizer application to rice and wheat showed increase in organic carbon and total soil nitrogen in both 0-20 and 20-40 cm soil depth. Available N, P and K content had positive balance in soil due to addition of green manure and at higher levels of fertilizer N application either to rice or to wheat crops. All the above nutrients had negative balance in soils of fallow plots and at lower level of nitrogen applied to rice or to wheat crops.

 

Keywords : Balance sheet, Rice-wheat, Organic matter, Total N, Available NPK.

 

 

BACK