【摘要】 在人为控制水分的盆栽条件下,对不同生育时期的水稻进行水分胁迫,研究其对稻谷产量和产量构成因子的影响。结果表明:孕穗Ⅲ期-齐穗期是水稻的第一敏感时期,缺水受旱会导致绝收;齐穗期-蜡熟期是第二敏感时期,受旱将导致严重减产;但在营养生长阶段(有效分蘖终止期前)适度受旱,虽然会减少有效穗数,但通过着粒数和千粒重的弥补,从而导致稻谷产量增加。因此在水稻节水栽培的水分调配上,水稻孕穗-齐穗灌浆阶段,必须保证水分供应,但在稻株移栽成活后即可减少灌水,特别在分蘖盛期后还可晒田。更多还原

【Abstract】 Effects of water stresses on grain yield and yield components at the different rice growth stage was studied in pot experiment under manually controlled condition.The results showed that the first sensitive period to water stress was from young panicle differentiation Ⅲ to full heading;when the serious drought occurred at that time,there was no yielding.The second sensitive period was from full heading to wax maturity;when drought occurred at this period,the yields decreased seriously.But the yield will increase slightly when the water stresses occurs at the period from most active tillering stage to the young panicle initiation due to the increase of spikelets and 1000-grain weight. Therefore,the irrigation water could be allocated in water-saving culture as below:to keep the water level in paddy field from young panicle differentiation stage to the milk ripening stage,to reduce the irrigation amount after the recovering stage,and to drain the paddy field after most active tillering stage to panicle initiation.更多还原