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Impact of 15N-labeled rice straw and rice straw compost application on N mineralization and N uptake by rice | ||
| International Journal of Plant Production | ||
| مقاله 2، دوره 2، شماره 4، دی 2008، صفحه 289-296 اصل مقاله (153.74 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22069/ijpp.2012.620 | ||
| نویسنده | ||
| A. Ghoneim* | ||
| Rice Research & Training Center, Field Crops Research Institute, Agricultural Research Center, Egypt. | ||
| چکیده | ||
| Incorporation of plant residues in soil affects N and C content and dynamics. This study determined the effects of short-term alternative rice (Oryza sativa L.) residue management on N mineralization and uptake by rice. Pot and laboratory incubation experiments were established by incorporating 15N-labeled rice straw and rice straw compost in paddy soil. The 15N recovered by rice averaged 16.6%; most of this recovered 15N-fertilizer was cycled through soil pools and only small amounts originated from labeled rice residues. At harvest, denitrification rate of rice straw and rice straw compost was 27.2% and 38.5%, respectively in the pot experiment, while residual N in soil ranged from 56.2% and 55.1%, respectively. The incubation study showed that about 22-26% of N from 15N-labeled rice straw was mineralized over a period of 105 days. Recovery of residual 15Nfertilizer appears to contribute little to total inorganic N. The results showed that rice residues exerted a small and short-term positive effect on N mineralization and N uptake. | ||
| کلیدواژه‌ها | ||
| Soil N pool؛ N uptake؛ 15N-labeled rice residues؛ Nitrogen recovery | ||
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سامانه مدیریت نشریات علمی. طراحی و پیاده سازی از سیناوب