Effects of Irrigation Amount and Frequency on Yield and Quality of Small-fruit Watermelon in Greenhouse
Based on the water surface evaporation of a 20 cm evaporating dish and the water demand law of watermelon at different growth stages,the effects of irrigation amount and irrigation frequency on the growth,yield and quality of small-fruit watermelon were studied.The results showed that the stem diameter,leaf chlorophyll content,fruit yield,quality and irrigation water use efficiency of watermelon were closely related to irrigation amount and irrigation frequency.Among them,W2F2(irrigation volume 75％Ep,irrigation frequency 6 d)had the best comprehensive performance.The quality indexes of watermelon fruit such as soluble solids,glucose,sucrose,fructose and lycopene content in this treatment were the highest,and the nitrate content was low;the yield reached 41247 kg/hm2,which had no significant difference from W3F1(irrigation volume 90％Ep,irrigation frequency 3 d)with the highest yield;the irrigation water use efficiency was 53.4 kg/m3,and there was no significant difference from the highest W1F1(irrigation volume 60％Ep,irrigation frequency 3 d);other indexes were at the middle level,indicating that W2F2 was the best irrigation technology scheme.This study can provide theoretical and technical support for green and high-quality production of small-fruit watermelon in greenhouse.
watermelonirrigation amountirrigation frequencyyieldqualityirrigation water use efficiency
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