Multiseason Recoveries of Organic and Inorganic Nitrogen-15 in Tropical Cropping Systems

文献类型： 外文期刊

第一作者： van Kessel, C.

作者： van Kessel, C.;Dourado Neto, D.;Basanta, M. V.;Powlson, D.;Abu Bakar, R.;Bacchi, O. O. S.;Reichardt, K.;Cong, P. Thi;Keerthisinghe, G.;Ismaili, M.;Rahman, S. M.;Safwat, M. S. A.;Sangakkara, R.;Timm, L. C.;Wang, J. Y.;Zagal, E.

作者机构：

关键词： Soil Science;Agrichemicals;Agriculture

期刊名称：SOIL SCIENCE SOCIETY OF AMERICA JOURNAL （ 影响因子：2.307； 五年影响因子：2.832 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： In tropical agroecosystems, limited N availability remains a major impediment to increasing yield. A N-15-recovery experiment was conducted in 13 diverse tropical agroecosystems. The objectives were to determine the total recovery of one single N-15 application of inorganic or organic N during, three to six growing seasons and to establish whether the losses of N are governed by universal principles. Between 7 and 58% (average of 21%) of crop N uptake during the first growing season was derived from fertilizer. On average, 79% of crop N was derived from the soil. When N-15-labeled residues were applied, in the first growing season 4% of crop N was derived from the residues. Average recoveries of N-15-labeled fertilizer and residue in crops after the first growing season were 33 and 7%, respectively. Corresponding recoveries in the soil were 38 and 71%. An additional 6% of the fertilizer and 9.1% of the residue was recovered by crops during subsequent growing seasons, There were no significant differences in total N-15 recovery (average 54%) between N from fertilizer and N from residue. After five growing seasons, more residue N (40%) than fertilizer N (18%) was recovered in the soil, better sustaining the soil organic matter N content. Long-term total recoveries of N-15-labeled fertilizer or residue in the crop and sod were similar. Soil N remained the primary source of N for crops. As higher rainfall and temperature tend to cause higher N-15 losses, management practices to improve N use efficiency and reduce losses in wet tropical regions will remain a challenge.

分类号： S15

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