The Effect of Wheat Straw, Corn Straw and Tobacco Residues on Denitrification Losses in a Field Planted with Wheat

Authors : Ali COŞKAN, Mustafa GÖK, İşık ONAÇ

Pages : 349-353

View : 26 | Download : 10

Publication Date : 2002-12-01

Article Type : Research Paper

Abstract :A field experiment was conducted to determine the effects of different organic residues insert ignore into journalissuearticles values(OR); insert ignore into journalissuearticles values(e.g., wheat straw corn straw and tobacco residues); on nitrogen mineralization and denitrification loss insert ignore into journalissuearticles values(N2O-N); using application rates recommended to local farmers. Nitrate and ammonium analyses were carried out on periodically collected soil samples. In-situ denitrification loss was determined using the acetylene inhibition technique insert ignore into journalissuearticles values(AIT);. The results revealed that OR application increased N mineralization significantly. In the favorable conditions for nitrification and intensive mineralization period, NO3--N accumulation at 0-60 cm depth peaked at 163.0, 177.7 and 226.6 kg N ha-1 in plots with wheat straw, corn straw and tobacco waste, respectively. In-situ denitrification measurements showed that intensive mineralization, depending on temperature and humidity conditions, significantly increased denitrification losses. The denitrification values measured showed a variation between 7.58 and 17.40 kg N2O-N ha-1. The results also showed that the effect of organic substrates on N loss via denitrification was highly dependent on the type of organic substrate used, and the C/N ratio of the organic substrate played an important role in N loss by denitrification.
Keywords : Wheat straw, corn straw, tobacco waste, denitrification