This study investigated the effects of different irrigation amounts on the growth,development and yield of different wheat varieties to provide a reference for water-saving irrigation in Baoji.A two-factor ran-domized block design was used,with'Zhoumai 27'and'Luohan 22'(strong drought resistance)as the main treatments.Four water treatments were applied to each variety:CK(240m3/km2 irrigation during wintering pe-riod + 210 m3/km2 irrigation at jointing stage 210 m3/km2),W1(160 m3/km2 irrigation during wintering peri-od + 140 m3/km2 irrigation at jointing stage),W2(80 m3/km2 irrigation during wintering period + 70 m3/km2 irrigation at jointing stage),and W3(no irrigation during wintering period + no irrigation at jointing stage).This study explored the effects of different irrigation amounts on plant height,chlorophyll content,leaf area index,dry matter quantity,yield traits and grain yield of wheat.The results showed that:(1)With the de-crease of irrigation amount,plant height,chlorophyll content,leaf area index,dry matter mass,panicle num-ber,grain number per panicle,1 000-grain weight and yield of wheat reduced in the whole growth stage,and the water use efficiency increased and then decreased.(2)'Luohan 22'exhibited lower reductions in different in-dexes compared to'Zhoumai 27'under different irrigation treatments,the water use efficiency of'Luohan 22'un-der W1 and W2 was significantly higher than that of CK,and the yield of'Luhan 22'remained stable under W1 treatment due to increased panicle number,grain number per panicle,and 1 000-grain weight,as well as en-hanced soil water absorption and water use efficiency regulation abilities.(3)Leaf area index of'Zhoumai 27'showed no significant change under W1 and CK treatments;dry matter quality of'Zhoumai 27'showed no sig-nificant change under W1 and CK at jointing stage and booting stage,and leaf area index and dry matter mass accumulation were closely related to yield,as a result,the spike number of'Zhoumai 27'did not decrease sig-nificantly.(4)Compared with CK,the wheat yield of'Zhoumai 27'and'Luohan 22'decreased by 51.4%and 40.6%,respectively.In terms of integrated water conservation and yield,W1(160m3/km2 during overwin-tering period + 140m3/km2)is identified as the optimal irrigation scheme for achieving high wheat yield under the experimental conditions.
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