负压渗灌条件下不同供水吸力对茄子生长及产量的影响

Effects of Water Supply Suction on Growth and Yield of Eggplant Under Negative Pressure Infiltration Irrigation

为探求塑料大棚茄子不同生育期适宜的土壤含水量,采用负压渗灌灌溉设备在茄子不同生育期(苗期、花果期、采摘期)设定不同供水吸力(5、10、15、20、25 kPa)控制不同土壤含水量,研究分析了不同供水吸力对茄子生长状况、产量、水分利用效率的影响。研究结果表明土壤含水量随着供水吸力的增大而减小,供水吸力为5~25 kPa时,土壤相对含水量的变化范围为49%~97%。株高与不同供水吸力呈一次线性关系,茎粗与不同供水吸力呈现三次线性关系,株高、茎粗与苗期供水的相关性高于与花果期、采摘期供水的相关性。茄子产量、水分利用效率随着供水吸力的增加先增加后减少,各处理中苗期15 kPa、花果期15 kPa、采摘期10 kPa时茄子产量和水分利用效率最高。研究结果可为大棚蔬菜精准灌溉提供理论依据。

To examine the demand of water at different growth stages of plastic tunnel eggplant,the negative pressure irrigation facilities were applied to irrigate eggplant at three growth stages(seedling period, blooming and fruit period, and harvest period) using different water supply suction(5,10,15, 20, 25 kPa) to research the effect of different water supply suction on growth, yield and water use efficiency of eggplant. The results showed that the soil water content decreased with the increasing of water supply tension. When the water supply tension was 5~25 kPa, the relative water content of the soil ranged from 49% to 97%. Under negative pressure irrigation, there was a linear relationship between plant height and different water supply tension. The correlation between plant height, stem diameter and different water supply tension in seedling period was higher than that in blooming and fruit period, harvest period. Yield and WUE had a parabola change tendency under five treatments at each growth stage;The maximum yield and WUE appeared in seedling period, blooming and fruit period, and harvest period was 15, 15, 10 kPa. The results will enrich water regulation theory in precision irrigation of vegetables in plastic tunnel.