日光温室滴灌条件下土壤基质势对彩椒生长的影响

利用埋在滴头正下方0.2 m深度的真空表负压计,通过控制土壤基质势下限(-10 kPa,S1;-20 kPa,S2;-30 kPa,S3;-40 kPa,S4),研究太行山山前平原日光温室覆膜滴灌条件下土壤基质势对秋冬茬彩椒(紫星二号)(Capsicum frutescens L.)生长的影响。试验结果表明,彩椒的株高和叶面积随土壤基质势的提高而增加;但过高的土壤基质势导致彩椒产量下降,土壤基质势在-30 kPa时,彩椒产量和灌溉水利用效率最高;彩椒果实的可溶性糖和可溶性固形物含量随土壤基质势的提高而降低;彩椒果实的Vc含量和土壤基质势的变化梯度没有关系。综合考虑彩椒产量、品质和灌溉水利用效率,日光温室覆膜滴灌条件下彩椒的土壤基质势控制在-20~-30 kPa最为适宜。

Effect of Soil Matric Potential on Sweet Peppers Growth and Irrigation Water Use Efficiency under Mulched Drip Irrigation in Solar Greenhouses

By presetting threshold of soil matric potential(-10 kPa,S1;-20 kPa,S2;-30 kPa,S3;-40 kPa,S4)to control the timing of the irrigation cycle with vacuum tensiometers buried at 20cm depth under emitter,field experiments were carried out to investigate the effect of soil matric potential on the growth of sweet peppers under mulch drip irrigation in solar greenhouses in 2009.The results showed that the plant height and LAI of sweet peppers increased with the increasing of soil matric potential.The higher soil matric potential lead to the decrease of fruit yields,and the highest fruit yields and the highest irrigation water use efficiency were achieved with the soil matric potential of-30 kPa.The lower the soil matric potential was,the higher of the sugar content and the soluble solid content.The vitamin C content of the fruit had nothing to do with the soil matric potential.From the viewpoint of high yield,good fruit quality and water saving,the soil matric potential for sweet pepper in the solar greenhouse was suggested from-20 to-30 kPa.