黄土高原半干旱区春小麦农田有限灌溉对策初探

Preliminary study on limited irrigation for spring wheat field in semi-arid region of loess plateau

２年的大田试验研究表明，在黄土高原半干旱区，春小麦农田有限灌溉的关键时期为３叶期到孕穗期之间，但由于该地区降水变率很高，不同降水年型有限灌溉的关键时期和增产效果有很大差异，实际的需水关键期和作物生理的需水关键期往往不相吻合．对半干旱地区的有限灌溉对策及作物的耗水过程和产量形成过程进行了讨论．

Two years field experiment shows that in semi-arid region of loess plateau, the critical period of limited irrigation for spring wheat field is from 3 leaves stage to boot stage, but owing to high variability of rainfall in the region, the critical period and the effect of increasing yield in various year types of precipitation are different and actual critical period did not coincided with physiological one. The countermeasures for limited irrigation in semi-arid region and water consumption and yield formation processes are discussed in this paper.