Gorgan University of Agricultural Sciences International Journal of Plant Production 1735-6814 2 4 2012 07 28 Impact of 15N-labeled rice straw and rice straw compost application on N mineralization and N uptake by rice 289 296 620 10.22069/ijpp.2012.620 EN A. Ghoneim Rice Research & Training Center, Field Crops Research Institute, Agricultural Research Center, Egypt. Journal Article 2012 07 28 Incorporation of plant residues in soil affects N and C content and dynamics. This study<br />determined the effects of short-term alternative rice (Oryza sativa L.) residue management on N<br />mineralization and uptake by rice. Pot and laboratory incubation experiments were established by<br />incorporating 15N-labeled rice straw and rice straw compost in paddy soil. The 15N recovered by rice<br />averaged 16.6%; most of this recovered 15N-fertilizer was cycled through soil pools and only small<br />amounts originated from labeled rice residues. At harvest, denitrification rate of rice straw and rice<br />straw compost was 27.2% and 38.5%, respectively in the pot experiment, while residual N in soil<br />ranged from 56.2% and 55.1%, respectively. The incubation study showed that about 22-26% of N<br />from 15N-labeled rice straw was mineralized over a period of 105 days. Recovery of residual 15Nfertilizer<br />appears to contribute little to total inorganic N. The results showed that rice residues exerted<br />a small and short-term positive effect on N mineralization and N uptake. https://ijpp.gau.ac.ir/article_620_0de429a86201158e8f9e9fcd2ca0379d.pdf