Effects of plant residues on nitrogen supply in arable lands
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2015, Vol 9, Issue 6
Abstract
To evaluate the mineralization of organic nitrogen of plant materials (clover, maize and wheat) an experiment was conducted as a completely randomized design with three replications. Clover, maize and wheat residues were applied into the soil at the rates of 5, 25 and 2.5 tons/ha, respectively. The amount of organic nitrogen mineralization rate was calculated by kinetics first-order equations. The results showed that the highest and the lowest amount of nitrogen mineralization (Nmin) were belonged to maize residues (51 mg / kg of soil) and wheat straw (1.45 mg / kg of soil), respectively. Furthermore, the highest mineralization rate constant (K) was in clover and the lowest was in wheat straw. Nitrogen mineralization (Nmin) showed significant correlation with both mineralization potential (N0) and the index of nitrogen availability (N0K). The results indicated that the application of clover and maize residues and also wheat straw can add 78, 127 and 3.6 kg of mineral nitrogen to the soil during the growing season, respectively.
Authors and Affiliations
Saeed Samavat*| Soil & Water Research Institute, Karaj, Iran, email: agsama2000@gmail.com, Simin Samavat| Soil & Water Research Institute, Karaj, Iran
Keywords
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