Dynamic of Biomass, Yield and their Components of Sunflowers under Different Irrigation Modes

XU Zhao; SHI Haibin; LI Xianyue; ZHENG Qian; NI Dongning; LIU Meihan

doi:10.13522/j.cnki.ggps.2017.03.004

Abstract：A field experiment was conducted in Hetao Irrigation District to evaluate the effects of different irrigation regimes on biomass accumulation,allocation,and irrigation water-use efficiency in sunflower,including five treatments:local conventional irrigation amount (pre-sowing 135 mm,rewatering 90 mm),A1 (pre-sowing 108 mm,rewatering 90 mm),A2 (pre-sowing 81 mm,rewatering 90 mm),B1 (pre-sowing 108 mm,rewatering 72 mm) and B2 (pre-sowing 81 mm,rewatering 72 mm),respectively.The results showed that with the proper reduction of pre-sowing irrigation amount,then rewatering,the significant compensation growth was expressed in biomass accumulation of sunflower,and the compensation effect of biomass of full rewatering was 16.45％～32.24％ higher than the deficit rewatering.Under the same amount of pre-sowing irrigation,the final biomass of full rewatering was significantly higher than deficit rewatering in the harvest period,and the percentage of grain were significantly different (P＜0.05) among different rewatering treatments in the harvest period.The percentage of grain to final biomass ofAl treatment was the highest,reaching 43.02％.With the proper reduction ofpre-sowing irrigation amount (108 mm),then full rewatering,the economic yield were significantly improve (P＜0.05).But,under the same pre sowing irrigation level,economic yield of the reduction of rewatering irrigation amount would be significantly reduced during bolls-flowering.Comprehensive evaluation of the effect indexes of correlation on different irrigation modes by subordinate function showed that A1 treatment was optimal.And economic yield and irrigation water-use efficiency of A1 treatment were 8.47％ and 23.19％ higher than CK,respectively,because the average number of grains per plant and seed-setting rate were significantly increased.Research shows that suitable sunflower irrigation regime is 108 mm of pre-sowing irrigation,and 90 mm of rewatering during bolls-flowering in Hetao Irrigation District.