西瓜和蜜瓜咸水滴灌的作物系数和耗水规律

在采用测渗仪测得内蒙古河套地区进行的西瓜、蜜瓜咸水滴灌田间试验的数据,利用水量平衡原理,计算出在不同灌水量条件下的耗水规律,得出作物在适宜生长条件下的耗水量,即作物需水量。根据美国A级蒸发皿和中式皿的自由水面蒸发量的关系以及美国A级皿的蒸发量和参照作物需水量之间的关系,推算出了作物各生育期的参照作物需水量ETr,计算出作物各生育期的作物系数KC和以中式蒸发皿为基础的作物需水系数。所得参数可为类似地区的西瓜和蜜瓜滴灌系统灌溉制度的设计提供参考。

Crop coefficients and water use of watermelons and honeydew melons in saline water drop irrigation

Field experiment of saline water drip irrigation for watermelon and honeydew melons was conducted in Hetao region of Inner Mongolia, China. The water requirement which indicates the favorite water consumption for growth under different conditions of water application were obtained from the observation data measured by lysimeters and calculated according to the water balance theory. The reference crop water requirement can be calculated from the evaporation measured by evaporimeter. On this basis the crop coefficients reflecting the effects of crop characteristics, crop yield level, soil condition and method of cultivation on crop water requirement can be deduced according to the relationship between measured water requirement and reference crop water requirement.