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Study on 15N Labeled Rice Controlled Release Fertilizer in Increasing Nitrogen Utilization Efficiency
Author(s): 
Pages: 87-92
Year: Issue:  2
Journal: ACTA LASER BIOLOGY SINICA

Keyword:  水稻控释氮肥水稻15N肥料效应氮的损失;
Abstract: 本文应用15N示踪技术研究了水稻对控释氮肥和尿素氮吸收利用效率的影响以及氮的去向.结果表明,施肥后11天内,水稻控释氮肥和尿素的NH3挥发损失分别占施入氮量的0.69%和1.81%.NH3的挥发损失在施肥后第5天时达到最大值,此后逐渐降低.水稻控释氮肥和尿素氮的淋溶损失分别占施入氮量的0.95%和1.02%.水稻控释氮肥氮的淋溶损失在水稻整个生长期间均比较平缓,施肥后40天时略有上升,此后又缓慢降低.用氮素平衡帐中的亏缺量扣除氨的损失量后计为硝化-反硝化损失量的结果表明,水稻控释氮肥氮的硝化-反硝化损失量占施入氮量的3.46%,而尿素氮的硝化-反硝化损失量却高达37.75%.肥料氮在土壤中的残留主要集中在0~35?cm的土层中,达91.4-91.5%,残留在35?cm以下土层中的氮甚微.水稻控释氮肥残留在土壤中的氮量略高于尿素处理.水稻控释氮肥利用率高达73.8%,比尿素高出34.9%.水稻控释氮肥氮利用率高的原因是因氮从颗粒中缓慢释放、受淋溶、氨挥发、尤其受硝化-反硝化途径损失的氮较少.在施等氮量的条件下,施用水稻控释氮肥的稻谷产量比尿素的增产25.5%,达到p=0.05的显著水平.
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