水肥对旱区马铃薯水分利用率的影响

采用裂区试验设计,以施钾水平为主处理,补水时期为副处理,研究了补充供水和钾素处理对马铃薯不同层次水分利用效率的影响,结果表明:马铃薯生育期耗水主要集中在80cm土层深度内,80cm土层以下土壤含水量变化不明显,基本不被马铃薯吸收利用。在氯化钾为150kg/hm2及苗期补水条件下,群体水平和产量水平水分利用率(WUE)均最高,分别为41.71和94.21kg/(mm.hm2),单叶水平WUE最低,但产量均为最高值(36324.97kg/hm2)。

EFFECTS OF APPLICATION OF POTASSIUM AND DIFFERENT STAGE OF WATER SUPPIEMENT ON POTATO WATER USE EFFICIENCY IN SEMI-ARID AREA

The experiment of split-plot design with main treatments of potassium application and sub treatments of different stage water supplement was conducted to study the effect of above treatments on potato yield and Water use efficiency (WUE) in semi-arid area. The results showed that water consumption of potato during the growing season concentrated in the 80cm soil depth mainly. The change of water content below 80 cm layer was not significant and was blmost not absorbed by potato basically. Under the condition of water supplement when seedling stage and the potassium application rate at 150kg/hm2, Water use efficiency (WUE) at population and yield level of potato were the highest, 41.71 and 94.21kg/mm·hm2 respectively, and the yield were also the highest(36324.97 kg/hm2), however WUE at leaf level was the lowest.