需水临界期

叶丛快速生长期是甜菜生长的需水临界期，这一时期缺水将严重影响产量。

Water is crucial for beet yield during the phyllome speed - growth stage .

春小麦生育耗水与自然降雨供水错位，拔节到抽穗期为需水临界期，亦为灌水关键期。

The water consumption of spring wheat fails to take advantage of the nature rain . The jointing stage and the heading stage are the critical period .

开花坐果期是枣树需水临界期，通过分析枣树需水信息可以为合理灌溉提供生理技术支撑。

Anthesis and fruit setting periods are critical time of water requirement for jujube . It can provide physiological technology for reasonable irrigation to analyze water requirement information of jujube .

结果表明，苗期至分枝期是紫花苜蓿的需水临界期；

The results showed that the critical water stage was seedling to branching period , and the most water consumption took place during branching to flowering stage when the growth speed was the fastest .