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利用水分平衡法测定谷子全生育期的需水量及各生育阶段的需水量,从而探讨产量与需水量的关系。研究结果表明:谷子不同生育阶段的耗水率不同;同一生育阶段的土壤水分含量不同,对谷子的农艺性状及产量的影响也不同。苗期耗水少,拔节开始需水增加,孕穗期需水出现高峰,开花至灌浆期需水仍较多,灌浆后渐减。求出谷子各生育阶段需要的适宜土壤含水量;计算出形成0.5kg子实的每个生育阶段的需水量,采取相应的农业措施,是使谷子大幅度增产的关键所在。
The water balance method was used to determine the water demand during the whole growth period and the water requirement of each growth stage to discuss the relationship between yield and water requirement. The results showed that the water consumption rate of millet at different growth stages was different. The soil moisture content at the same growth stage had different effects on agronomic traits and yield of millet. Water consumption at seedling stage is less than that at jointing stage. Water demand increases at booting stage, and water demand is still high at flowering and filling stages, and then decreases after grouting. Calculate the suitable soil water content for each growth stage of millet; Calculate the water requirement of each growth stage to form 0.5kg seed, and take the corresponding agricultural measures, which is the key point to increase the yield of millet significantly.