论文部分内容阅读
为了降低氮肥用量,提高其利用效率,在不施基蘖肥的条件下,研究了不同叶龄期施穗肥对籼稻产量及氮肥利用效率的影响。结果表明,倒5叶施60%+倒3叶施40%氮肥(T3,氮肥用量120 kg/hm~2)、倒4叶施100%氮肥(T4,氮肥用量120 kg/hm~2)、倒4叶施60%+倒2叶施40%氮肥(T5,氮肥用量120 kg/hm~2)、倒5叶施100%氮肥(T2,氮肥用量120 kg/hm~2)、均施氮肥(CK,氮肥用量195 kg/hm~2)的产量分别为12.90、12.74、12.69、12.32、13.25 t/hm~2,氮肥贡献率分别为17.71%、16.58%、16.25%、13.77%、19.86%,氮肥农学利用率分别为18.08、16.73、16.33、13.26、13.24kg/kg。总之,倒5叶施60%+倒3叶施40%氮肥的处理比均施氮肥处理氮肥用量减少38.46%,但产量及氮肥利用率差异不大。
In order to reduce the amount of nitrogen fertilizer and improve its utilization efficiency, under the condition of no base tillering fertilizer applied, the effect of topdressing spike fertilizer on the yield and nitrogen use efficiency of indica rice was studied. The results showed that 40% nitrogen fertilizer (T3, 120 kg / hm ~ 2 nitrogen fertilizer) was applied on the top 5 leaves and 100% nitrogen on the top 4 leaves (T4, nitrogenous fertilizer 120 kg / hm ~ 2) 60% of the top 4 leaves and 40% of the nitrogen fertilizer (T5, 120 kg / hm ~ 2) were applied to the 2 leaves and 100% nitrogen fertilizer (T2, 120 kg / hm ~ 2 nitrogen fertilizer) The yield of nitrogen fertilizer was 12.90, 12.74, 12.69, 12.32 and 13.25 t / hm ~ 2, respectively. The contribution rate of nitrogen fertilizer was 17.71%, 16.58%, 16.25%, 13.77% and 19.86% , Nitrogen fertilizer agronomic utilization rates were 18.08,16.73,16.33,13.26,13.24kg / kg. In conclusion, the application of 40% N fertilizer by 60% + 3 leaves in the inverted 5-leaf application was 38.46% less than that of nitrogenous fertilizer application, but the difference in yield and N use efficiency was not significant.