日光温室不同茬口黄瓜对水分需求的规律

Study on Water Requirement of Cucumber of Different Cropping in Solar Greenhouse

对不同茬口日光温室黄瓜对水分的需求进行了研究。结果表明 ,日光温室内冬春、秋冬茬的光温环境差异很大。随黄瓜生育进程以及日光温室内光温环境的变化 ,蒸发速率和日蒸发量冬春茬不断上升而秋冬茬初花期开始不断下降 ;冬春茬和秋冬茬蒸腾速率和日蒸腾量均增加 ,但秋冬茬增加缓慢、约为同期的 4 5 % ;水分的需求秋冬、冬春茬均随黄瓜生育进程增加 ,且苗期相近、约为 0 5 5mm/d ,初花期开始冬春茬较秋冬茬增加快 ,结瓜期冬春茬水分需求维持在 2 0mm/d以上、秋冬茬约为冬春茬的 4 0 %。日光温室内水分的散失苗期主要通过蒸发而结瓜期主要通过植株蒸腾散失。

Water requirement of cucumber of different cropping in solar greenhouse was studied The results indicated that inner light and temperature of solar greenhouse were varied with the cropping of winter-spring and autumn-winter Evaporation rate and diurnal evaporation amount increased in winter-spring whereas decreased since early bloom stage in autumn-winter with the development of cucumber and greenhouse inside light and temperature changed Transpiration rate and diurnal transpiration amount increased both in winter-spring and in autumn-winter,but it increased slowly in autumn-winter with about 45% of the same stage of winter-spring Water requirement increased with the development of cucumber both in winter-spring and in autumn-winter Water requirement was close at plantlet stage with about 0 55 mm/d,but it increased more quickly in winter-spring than in autumn-winter since early bloom During fruit bearing stage water requirement kept over 2 0 mm/d in winter-spring while about 40% of this level at the same stage in autumn-winter At plantlet stage water scattered through evaporation and at fruit bearing through transpiration in solar greenhouse