不同控制下限对水稻灌水量、分蘖以及产量的影响

Effects of Different Lower Control Limit on Rice Irrigation Amount,Tillering and Yield in Cold Area

为了研究在不同土壤水分控制下限时对水稻灌水量、分蘖及产量的影响,设计了4个处理(即控灌Ⅰ、控灌Ⅱ、控灌Ⅲ、常灌)进行对比试验。试验结果表明:4个处理的灌水量走势基本是一致的,都在拔节孕穗期的灌水量最多,每个生育期灌水量都是常灌>控灌Ⅲ>控灌Ⅱ>控灌Ⅰ;4个处理的水稻分蘖趋势都是先增加后减少,都是在分蘖末期达到最大分蘖数,有效分蘖率大小顺序为控灌Ⅱ>控灌Ⅰ>控灌Ⅲ>常灌,与各处理最大分蘖数顺序一致;没有一种处理的产量指标都是最高的,4个处理的产量指标相差较大,但产量指标最终体现在产量上,控灌Ⅱ的产量是最高的,所以控灌Ⅱ产量指标相对是最优的。

In order to study the effects of different soil moisture lower control limits on irrigation amount , tillering and yield of rice ,a contrast experiment was carried out and four treatments were included ,which were controlled irrigation I , controlled irrigation II , controlled irrigation III , and conventional irrigation .The results showed that the trend of irrigation amount of four treatments were in line with each other , irrigation amount reached the maximum in the jointing booting stage , and the order of irrigation amount at each growth stage was：conventional irrigation 〉controlled irrigation III〉con-trolled irrigation II〉controlled irrigation I; all the trends of tillering of four treatments were increased initially and then decreased , the tillering number reached the maximum in the late tillering stage , the order of effective tillers was： con-trolled irrigation II〉controlled irrigation I〉controlled irrigation III〉conventional irrigation , which was similar to the or-der of maximum tillering number of each treatments;there was no treatment who has the highest value of all the yield in-dex .The differences of yield index of four treatments were large , but eventually the yield index was embodied in yield , controlled irrigation II has the highest yield , thus , the yield index of controlled irrigation II was relatively optimal .