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返青水小麦由返青到拔节,是继续分蘖进行小穗分化的阶段,此时土壤水分的多少,直接影响有效分蘖率的高低,和穗部小穗数的多少。因此,根据返青期土壤干湿的情况,密切配合追肥进行适时春灌,是增株增穗的主要措施。根据园田化研究所的试验,在这个阶段土壤水分以保持在田间持水率的60—85%为最适宜,如低于55%时,单株分蘖有效穗数和穗部性状的发育,即要受到影响。去年种的小麦,在冬季气温较高,蒸发量大,降雨量少的情况下,凡是年前未进行冬灌,或冬灌水量不足春季土壤水分不够的麦田,浇返青水的都获得了增产。据在霸县、南官、武清等地
Greening wheat from greening to jointing is to continue tillering spikelet differentiation stage, at this time the amount of soil moisture directly affects the effective tillering rate, and the number of spikelets spike. Therefore, according to the return of wet and dry soil conditions, in close cooperation with top-dressing spring irrigation, is the main measures to increase the plant spike. According to the test of the Yuanda Research Institute, the soil moisture is the most suitable for keeping the water content at 60-85% in the field at this stage. If the water content is less than 55%, the effective panicles per panicle and panicle traits are To be affected. The wheat of the previous year, with high winter temperatures, large evaporation and little rainfall, increased its yield of wheat fields irrigated with green irrigated water irrespective of years of winter irrigations or inadequate winter irrigations. According to Ba County, South Officer, Wuqing and other places