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以超级杂交稻桂两优2号为材料,在高肥力水平田块进行大田试验,设置3个施氮水平(172.5、207.0和241.5kg/hm2N)和3个施钾水平(216、288和360kg/hm2K2O),以不施氮钾肥的处理作为对照,研究不同氮钾肥用量对超级杂交稻的产量、产量构成和干物质生产与分配的影响。结果表明,施用氮钾肥促进了穗数、各生育期干物质积累量和抽穗期叶面积指数的提高,进而显著提高了产量,施钾肥的增产效应(18.6%~30.3%)略大于施氮肥(18.3%~28.3%),但不同氮肥和不同钾肥处理间的差异并不显著。在高肥力水平下,超级杂交稻桂两优2号对氮肥和钾肥施用量的敏感程度较低,其氮钾肥施用量分别不宜超过N 172.5kg/hm2和K2O 216 kg/hm2。
A field experiment was conducted in a field with high fertility level using the super hybrid rice Guiliangyou 2 as experimental material. Three nitrogen application rates (172.5, 207.0 and 241.5 kg / hm2N) and three potassium application rates (216, 288 and 360 kg / hm2K2O). The effects of N and K fertilizers on the yield, yield components and dry matter production and distribution of super hybrid rice were studied using the treatments without nitrogen and potassium fertilizers. The results showed that the application of N and K fertilizers increased the number of spikes, the accumulation of dry matter in each growth period and the leaf area index at heading stage, and then significantly increased the yield. The yield enhancement effect of applying K fertilizer (18.6% -30.3%) was slightly larger than that of N application 18.3% -28.3%), but the differences between different nitrogen fertilizers and different potassium fertilizers were not significant. Under the condition of high fertility, the super hybrid rice Gui Liangyou 2 was less sensitive to the application rates of nitrogen and potassium, and its nitrogen and potassium fertilizers should not exceed N 172.5kg / hm2 and K2O 216kg / hm2, respectively.