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以水稻盐丰47为材料,采用小区对比试验方法,研究了缓释肥大地丰与速效氮肥配比施用对水稻产量及氮肥利用率的影响。结果发现,在大地丰以施基蘖肥数量450 kg/hm~2+150 kg/hm~2的方式与速效氮肥配比施用时,1、2次蘖肥于5.5~6.0、6.5~7.0叶龄期施入的处理C4(47∶25∶15∶13∶0)的氮肥利用率达到46.58%,较同一施肥比例施肥时期不同的C3、C5处理分别高出4.27%、2.08%。结果表明,缓释肥大地丰以基蘖肥形式施用条件下,适宜后移速效氮蘖肥的施入更有利于水稻产量及氮肥利用率的提高。此外,可以将100 kg籽粒吸氮量、氮肥农学利用效率、氮肥偏生产力作为衡量氮肥利用率高低的指标。
Using rice salt Feng 47 as material, the plot comparison experiment was conducted to study the effects of slow-release fertilizers application of Dafeng and available N fertilizers on yield and nitrogen use efficiency of rice. The results showed that the first and second tillering fertilizer was 5.5-6.0 and 6.5-7.0 folds when the ratio of available nitrogen fertilizer was 450 kg / hm ~ 2 + 150 kg / hm ~ 2, The nitrogen utilization efficiency of treatment C4 (47:25:15:13:0) reached 46.58%, which was 4.27% and 2.08% higher than that of the same fertilization period under the same fertilization period. The results showed that under the conditions of application of base fertilizer with slow-release fertilizer in the form of base-tillering fertilizer, the application of suitable late-flow-rate nitrogen and nitrogen fertilizer was more beneficial to the increase of rice yield and nitrogen use efficiency. In addition, 100 kg grain nitrogen uptake, agronomic efficiency of nitrogen fertilizer, and nitrogen partial bioproductivity can be used as indicators to measure the level of nitrogen use efficiency.