旱作物关键灌水期的确定

为了节约灌溉水量，提高水的利用率，必须科学地确定作物全生长期中的各个关键灌水期。为此，根据作物在不同地区、不同生长阶段的缺水状况和作物因缺水造成的可能欠收幅度调查分析，并考虑缺水敏感期，提出了确定作物关键灌水期的原则和方法。

Determination of key Irrigation Time for Upland Crops

In order to save irrigation water and to raise the water use efficiency, it is necessary to determine the key irrigation times at the whole growing period of crops. The water shortage situation at different areas and different growing stages is analyzed in this paper. At the same time, the crop yield losses due to water shortage are investigated. In consideration of the water sensitive stage, the principle and method for determining the key irrigation times are provided by authors.