[Effects of regulated deficit irrigation on water consumption characteristics and water use efficiency of winter wheat].
With the high-yielding winter wheat cultivar Jimai 22 as test material, a field experiment was conducted in Yanzhou of Shandong to examine the effects of regulated deficit irrigation on the water consumption and water use efficiency (WUE) of the cultivar. Five treatments were installed, i.e., the soil relative moisture content at sowing, jointing, and anthesis stages being 80%, 65% and 65% (W0), 80%, 70% and 70% (W1), 80%, 80% and 80% (W2), 90%, 80% and 80% (W3), and 90%, 85% and 85% (W4), respectively. Under the condition of 228 mm precipitation in growth season, the total water consumption was higher in treatments W1 and W4 than in treatments W0, W2, and W3, and no difference was observed between treatments W1 and W4. Comparing with W4, treatment W1 decreased the water storage in 0-200 cm soil layer and the water consumption by wheat from jointing to anthesis stages, but increased the water consumption from anthesis to maturity stages. The water consumption rates at the stages from jointing to anthesis and from anthesis to maturity in treatment W4 were higher. Under regulated deficit irrigation, treatment W0 had higher WUE, but the grain yield was the lowest. The WUE in other treatments increased first, and then decreased with increasing irrigation amount. Both the water consumption and the grain yield were the highest in treatments W1 and W4, and treatment W1 had higher irrigation water use efficiency and irrigation benefit than treatment W4, being the best irrigation regime of high-yielding and water-saving in our study.
Ministry of Agriculture Key Laboratory of Crop Ecophysiology and Cultivation, Shandong Agricultural University, Tai'an 271018, Shandong, China. hanzhanjiang@163.com
Zhan-Jiang
ZJ
Han
Zhen-Wen
ZW
Yu
Dong
D
Wang
Xi-Zhi
XZ
Wang
Zhen-Zhu
ZZ
Xu
D057914:Agricultural Irrigation; D000383:Agriculture / Q000379:methods*; D018533:Biomass; D002681:China; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000254:growth & development* / Q000378:metabolism; D014867:Water / Q000378:metabolism* / Q000494:pharmacology
D012987:Soil; D014867:Water