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以菜心为试材,利用称重式蒸渗仪,以直径20cm的蒸发皿水面蒸发量(Ep)为基础标准,研究了在不同灌溉处理条件下(0.6E_p、0.7E_p、0.8E_p、0.9E_p)温室菜心生育期的蒸散量、蒸散速率、产量、生物量及水分利用效率,以探明温室菜心的耗水规律,明确温室菜心合理的灌溉量。结果表明:温室菜心生育期内蒸散量波动范围为0.73~3.52mm·d-1,前期及中后期的平均蒸散速率分别为1.43mm·d~(-1)和2.04mm·d~(-1),呈前期变化平稳,中后期变化剧烈的趋势;随着灌溉量的增加,菜心的蒸散量随之增加,温室菜心全生育期蒸散量为65.98~78.92mm。其中0.7E_p处理下温室菜心产量、生物量、产量水分利用效率及生物量水分利用效率均为最高。与0.6E_p、0.E_p处理和0.9E_p处理相比,0.7Ep处理的产量分别提高了25.16%(P<0.05)、5.63%和13.76%(P<0.05),产量水分利用效率分别提高了17.42%(P<0.05)、8.48%和27.66%(P<0.05),生物量分别提高了21.96%(P<0.05)、7.41%和17.68%(P<0.05),生物量水分利用效率分别提高了11.21%、10.32%和32.10%(P<0.05),0.7E_p灌溉量为供试条件下温室菜心的最优灌溉量。
Using Brassica campestris as test material, the evapotranspiration (Ep) of evaporating dish with a diameter of 20 cm was used as standard to evaluate the effects of different irrigation treatments (0.6E_p, 0.7E_p, 0.8E_p, 0.9 E_p) Evapotranspiration, Evapotranspiration, Yield, Biomass and Water Use Efficiency during the Growth of Cabbage in Greenhouse in order to find out the water consumption regularity of cabbage in greenhouse and determine the reasonable irrigation amount in greenhouse. The results showed that the evapotranspiration fluctuated within the range of 0.73-3.52mm · d-1 in the greenhouse, and the mean evapotranspiration rates in the early, middle and late stages were 1.43mm · d -1 and 2.04mm · d ~ (-1) 1) showed the tendency of stable change in the early stage and the trend of intense change in the late stage. With the increase of irrigation amount, the evapotranspiration of Brassica campestris increased, and the evapotranspiration of Brassica campestris was 65.98-78.92 mm. Among them, 0.7E_p treatment had the highest yield of cabbage, biomass, yield water use efficiency and biomass water use efficiency. Compared with 0.6E_p, 0.E_p and 0.9E_p, the yield of 0.7Ep increased by 25.16% (P <0.05), 5.63% and 13.76% (P <0.05), and the yield water use efficiency increased by 17.42 (P <0.05), 8.48% and 27.66% respectively (P <0.05), biomass increased by 21.96% (P <0.05), 7.41% and 17.68% (P <0.05), and the biomass water use efficiency increased 11.21%, 10.32% and 32.10%, respectively (P <0.05). The irrigation amount of 0.7E_p was the optimal irrigating amount for greenhouse cabbage under the test conditions.