氮素基、蘖肥减量对水稻生长及产量的影响

为研究水稻氮肥减量施用的有效途径，以粳稻品种‘通粳981’和‘南粳44’为材料，利用小区试验研究了在穗肥施用量相同条件下氮素基、蘖肥不同施用水平对水稻生长及产量的影响。结果表明：氮素基、蘖肥减量降低水稻高峰分蘖数，对水稻高峰分蘖数出现时期影响不大；氮素基、蘖肥减量使水稻剑叶抽穗后7天叶绿素含量增加，降低水稻干物质的积累，对水稻农艺性状影响不大；氮素基肥减少50%增加了叶基角与叶开角，降低了披垂度；氮素基肥减50%提高水稻成穗率、千粒重，使水稻增产或稳产。

Effect of Reduced Basic and Tillering Nitrogen Fertilizer on Yield and Growth of Rice

In order to study the effective way of reduced nitrogen fertilizer, two cultivars of ‘Tongjing 981’ and ‘Nanjing 44’ were used to study the effect of reduced basic and tillering nitrogen fertilizer on yield and growth of rice under the same application amount of earing fertilizer. The results showed that the peak tiller number reduced when the basic and tillering nitrogen fertilizer application amount was reduced, but the reduced amount had no significant effect on the appearing time of the peak tiller number. Chlorophyll content of flag leaf increased after 7 days of heading and the dry matter accumulation decreasd when reduced basic and tillering nitrogen fertilizer applied, but there was no significant effect on other agronomic traits of rice; leaf base angle and open angle increased and leaf drooping degree decreased when the basic nitrogen reduced 50%, but the percentage of earbearing tiller and thousand seed weight increased, which increased the yield of rice.