2011•Zhongguo nongye KexueRequires access
Studies on Compensation Effects of Rewatering on Winter Wheat Suffering from Droughts During Spring Under Different Soil Fertility Conditions
Tongbao Lin
Open publisher page 2 citations
Abstract
【Objective】A study was performed to explore the compensation effects of rewatering on winter wheat suffering from droughts during spring under different soil fertilities.【Method】Through pot experiments with high,medium and low soil fertilities,drought stresses were imposed on winter wheat initiated at reviving stage and jointing stage,and ended with rewatering at the beginning of the next stage.【Result】Chlorophyll content and photosynthetic rate of winter wheat suffering from medium drought at reviving stage showed obvious increase at 15 and 5 days after rewatering under high soil fertility,respectively,while they exhibited slight increase at 15 and 20 days after rewatering under medium and low soil fertilities.Photosynthetic rate of winter wheat suffering from medium drought at jointing stage only demonstrated weak increase at 20 days after rewatering under high soil fertility.Chlorophyll content and photosynthetic rate of the other treatments never reached the level of the control.Except the treatment of severe drought under low soil fertility,rewatering winter wheat suffering from drought at reviving stage showed insiginificant decrease in yield,but noticeable increase in harvest index and water use efficiency(WUE).The yield of rewatered winter wheat suffering from medium drought even exhibited slight increase under high and medium soil fertilities.Yield,harvest index and WUE of rewatered winter wheat suffering from droughts during jointing stage demonstrated obvious decreases.【Conclusion】Rewatering after drought at reviving stage exhibited stronger compensation effects on yield and WUE,which might result from the higher harvest index.Improving soil fertility could enhance compensation effects of rewatered drought-stressed winter wheat.Rewatering winter wheat after medium drought under high and medium soil fertilities during reviving stage would be more favorable to improve yield and WUE.