日光温室滴灌条件下滴头流量和间距对黄瓜生长的影响

滴头流量和滴头间距是影响滴灌系统投资的重要参数，为探索降低系统投资，在日光温室中进行了滴头流量和滴头间距对黄瓜生长影响的试验。试验共设4种处理，滴头流量/滴头间距分别为2.7 L·h^-1/30 cm、2.7 L·h^-1/50 cm、1.4 L·h^-1/30 cm和1.4 L·h^-1/50 cm，处理间灌水量相同。研究结果表明：在相同灌水量情况下，4种处理的产量分别为80.63、85.66、94.31和90.91 t/hm²，作物水分利用效率分别为23.6、24.9、27.9和25.4 kg/m³，没有形成显著统计差异。由此可见在试验限定条件下对于温室垄作黄瓜，滴灌系统采用较大的滴头间距和较小的滴头流量时，不会影响产量与质量，但可降低系统投资。试验还得出了黄瓜各生育阶段的耗水量、作物系数和需水系数。

Effects of dripper discharge and spacing on growth of cucumber in Chinese solar greenhouse under drip irrigation

Dripper discharge and spacing are two of the most important parameters of drip irrigation system designing. In order to investigate the investment of irrigation system, experiments were conducted to test the effects of dripper discharge and spacing on the growth of cucumber in solar greenhouse. Four treatments were designed and the dripper discharges (dripper spacing) were 2.7 L/h(30 cm), 2.7 L/h(50 cm), 1.4 L/h(30 cm) and 1.4 L/h(50 cm), respectively. The same irrigation amount was delivered in four treatments. The result showed that yields of four treatments were 80.63, 85.66, 94.31 and 90.91 t/hm² and water use efficiencies were 23.6, 24.9, 27.9 and 25.4 kg/m³, respectively. There was no significant statistical difference. It implied that for cucumber with ridges in greenhouse, the bigger dripper spacing and less discharge can be used in drip irrigation, plant yield and quality cannot be affected but the investment of irrigation system can be reduced. The evapotranspiration, crop coefficients and water requirement coefficients of cucumber under drip irrigation were also estimated in this paper.