土壤水分状况的好坏,直接影响到小麦的生长发育。通常情况下,当土壤湿度达到其最大持水量的80％以上时,根系的呼吸就会受到抑制,尤其在春后气温回升,小麦体内生理上发生急剧变化,其耐渍能力明显下降,所以农谚有“尺麦怕寸水”之说法。所谓“尺麦”即指处于拔节孕穗阶段的麦苗。这时小麦节间开始伸长,茎秆上部叶片的光合产物主要向茎穗部输送,而运送到根部的却很少。如果此时阴雨 Soil moisture status is good or bad, a direct impact on wheat growth and development. Under normal circumstances, when the soil moisture reaches its maximum water holding capacity of more than 80%, the respiratory system will be inhibited, especially in the spring after the temperature rise, sharp changes in the physiological physiology of wheat, its resistance to stains decreased significantly, so farming proverbs There is a “foot barrage inch of water” argument. The so-called “ruler” refers to the stage of jointing booting wheat seedlings. At this time, the internodes of the wheat began to elongate. The photosynthetic products of the upper leaves of the stalk were mainly transported to the spikes of the stems, but were rarely transported to the roots. If this time rainy