播前灌水量对不同品种棉花生长和产量的影响

How to guarantee high cotton yield under the condition of water saving, which is the problem needed to be solved for cotton production in the cotton region of Yellow River basin. The experiments of preseeding irrigation for two cotton varieties were conducted to study the effect of preseeding irrigation on cotton growth and yield in the year 2014, in Wei County, Hebei Province. Normal and water saving preseeding irrigation, which was respectively 900and 600 m3/hm2，were considered in the experiments. Two cotton varieties, Jifeng 151 ang Nongda 601, were planted in the experiments. The results showed that, with the increase of preseeding irrigation, the plant height, stem diameter and leaf area index (LAI) of cotton showed a trend of increase, while the chlorophyll value SPAD showed a trend of decrease. There were no significant differences in cotton root-shoot ratio between two preseeding irrigation. The boll number per plant for the treatment of normal preseeding irrigation was higher than that for the treatment of water-saving preseeding irrigation, but there were no significant differences in cotton yield between two preseeding irrigation. Water-saving preseeding irrigation could satisfy cotton growth in early stage, didn't cause the decrease of cotton yield, and was adapt to the current situation of water resources shortage in the cotton region of Yellow River basin.