Water demand regulation of pressed sand melon based on different drip irrigation quotas
Under the conditions of the field experiment,a randomized block design was adopted,and the irrigation quota was set to four treatments:High water 600 m3/hm2(A1),medium water 450 m3/hm2(A2),medium water 300 m3/hm2(A3),low water 150 m3/hm2(A4)and one control without irrigation(CK).The soil moisture content,crop coefficient,yield,water use efficiency and water de-mand regulation were studied in the field of pressed sand melon under different irrigation quotas.The results showed that soil moisture content,water consumption and yield increased with the increase of irrigation quota.The soil moisture content of 0～40 cm soil layer was the highest under A1 treatment,and the lowest under CK treatment.Comparing soil moisture content in different soil layers,the fluctuation of 0～10 cm was the most obvious,the fluctuation of 10～20 cm and 20～30 cm was the second,and the fluctuation of 30～40 cm was the least;water consumption at different growth stages under different treatments was manifested as fruit expansion stage>flow-ering and fruit-setting stage>extension stage>seedling stage>maturity stage,the daily water consumption was flowering and fruiting stage>fruit expansion stage>extension stage>seedling stage>maturity stage;the crop coefficient of each growth stage was flowering and fruit-setting stage>fruit expansion stage>extension stage>seedling stage>maturity stage.The water use efficiency increased with the increase of irrigation quota within a certain range,but the water use efficiency decreased when the irrigation amount was too high.Medium water treatment A2 had the highest water utilization efficiency,and the water resources were fully utilized.In consider-ation of water saving,water use efficiency and economic value,medium water treatment A2(450 m3/hm2)was the most suitable irriga-tion quota.
pressed sand melonirrigation quotawater demand regulationcrop coefficientwater use efficiency
NETL
NSTL
万方数据
