分蘖期受旱对水稻产量的影响

Effect of Suffering Drought in Rice Tillering Stage on its Yield

[目的]为水稻在非充分灌溉条件下获得最经济产量提供科学依据。[方法]以不受旱为对照,设水稻分蘖期分别受旱10、20、30、35、40 d,研究分蘖期受旱对水稻产量的影响。[结果]对照的平均产量最高,为8 100 kg/hm2,受旱10、20、30、35、40 d的平均产量分别为8 000、7 900、7 025、6 325、5 575 kg/hm2,减产率分别为1.1%、2.4%、13.1%、21.9%、31.1%。水稻在分孽期受旱20 d内不减产,20 d以上,受旱天数越长,减产越严重。[结论]水稻在分孽期受旱的减产量与受旱天数呈极显著的曲线相关关系,且受旱天数越长,减产越严重。

To supply scientific basis for obtaining the most economic yield of rice under inadequate irrigation,the rice suffering drought for 10,20,30,35 and 40 days.In tillering stage were set up,respectively,and the effect of suffering drought in tillering stage on the yield of rice was studied.The average yield of CK was highest（8 100 kg/hm^2）.The average yields in the treatments of suffering drought for 10,20,30,35 and 40 days were 8 000,7 900,7 025,6 325,5 575 kg/hm^2,respectively and their yield reduction rates were 1.1%,2.4%,13.1%,21.9% and 31.1%,respectively.The rice suffering drought in tillering stage for less than 20 days had no yield reduction,after the 20th day,the longer the days of suffering drought were,the more serious the yield reduction was.The yield reduction of rice suffering drought in tillering stage had extremely significant curvilinear correlation with the days of suffering drought.