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以垦鉴稻5号和垦稻12号为材料,采用负压式土壤湿度计监测土壤水势,通过防雨棚内的盆栽控水试验,研究水稻结实期水分供应对寒地水稻生育和产量的影响。主要结果如下:结实期进行-8~-10 kPa的间歇控水处理,两品种穗长和单穗重增加,干物重和叶面积降低;两品种穗数减少,结实率增加,千粒重降低,经济产量降低。结实期进行-18~-20 kPa和-28~-30 kPa的持续控水处理,两品种的穗长增加,单穗重降低,干物重和叶面积降低;两品种的穗数减少,结实率、千粒重和经济产量降低。结实期进行-8~-10kPa的间歇控水处理可作为寒地水稻节本增效灌溉的土壤水势指标,结实期不宜持续进行土壤水势为-18~-20 kPa以下的控水处理。
Taking Kenjiandai5 and Kenyao12 as materials, the negative pressure soil moisture meter was used to monitor the soil water potential. Through the potted water control experiment in the canopy, the effects of water supply during grain filling stage on rice growth and yield in cold area were studied. influences. The main results are as follows: During the fruiting period, intermittent water treatment of -8 ~ -10 kPa was carried out. The spike length and single spike weight of two cultivars increased, and the dry matter weight and leaf area decreased. The spikelets number, seed setting rate and grain weight of two cultivars decreased. Yield decreases. During the seed-setting period, water-holding treatments of -18 ~ -20 kPa and -28 ~ -30 kPa were carried out. The spike length increased, the single panicle weight decreased, the dry matter weight and the leaf area decreased. , Grain weight and economic output decreased. The intermittent water control treatment of -8 ~ -10kPa can be used as the index of soil water potential for efficiency irrigation in cold region in the frying period. It is unfavorable to continue the water control treatment with the soil water potential below -18 ~ -20kPa in the seed setting stage.