Abstract: In order to establish the optimal irrigation strategy for hexi corridor oasis in arid and semi-arid agriculture planting potato,through the field experiment,the influence of water regulated deficit irrigation (WDR) on the dry matter weight of different potato organs,product yield,and water use efficiency (WUE).According to the different growth stages at different water deficit levels of potato,the experiment was composed of five water deficit regulation treatments and one control CK treatment,low water deficit treatment WD1,WD2 and WD3 in tuber initiation stage,tuber bulking stage and in starch accumulation stage (soil moisture content was maintaining at 55% to 65% of field capacity,FC,Field capacity),medium water deficit treatment WD4 and WD5 in tuber initiation stage and tuber bulking stage (soil moisture content was maintaining at 45% to 55% of FC),fully irrigated treatment CK during growth stages of potato (soil moisture content was maintaing at 65% to 75% of FC).The experiment result illustrates that water deficit in different growth periods can lead to the decreasing of the quality of dry matter existing in potato stem and leave,but could be increasing in potato tuber in whole growth periods gradually.The mild and moderate regulated deficit irrigation during the formative period of potato tuber both had less influence than the moderate regulated deficit irrigation during the expanding period on the yield of potato.The more serious deficit irrigation degree,the greater the decline in yield.The water deficit of potato had a great affection on water consumption in different periods,the greater degree the deficit irrigation had,the more significant difference between water consumption and full irrigation plots(CK).The highest water use efficiency (WUE) was maintained in low WDR potato during tuber initiation,significantly improved by 24.05%,19.39%,8.31% than that in medium WDR plots during tuber bulking,low WDR plots during potato starch accumulation and CK respectively.Therefore,potato membrane under drip deficit irrigation could affect the quality of dry matter of different organs,beneficial to the improvement of the water use efficiency.And compared with the whole growth period sufficient water treatment CK,tuber formation mild deficit irrigation at yield under the condition of slightly lower (5.31% reduction) could significantly improve the water use efficiency (14.3%) and irrigation water use efficiency (18.5%).

Key words: Oasis potato, Water deficit, Mulched drip irrigation, Yield, Water use efficiency

CLC Number: 

• S152.7

• S275.6