Crop coefficient determination and evapotranspiration estimation of watermelon under water deficit in a cold and arid environment

• DOI: 10.3389/fpls.2023.1153835
• Publication Date: 2023-06-16T05:20:31Z
• Authors: Hengjia Zhang; Zeyi Wang; Shouchao Yu; Anguo Teng; Changlong Zhang; Lian Lei; Yuchun Ba; Xietian Chen
• Keywords: Crop coefficient; Growing season; Water Use Efficiency; Sunshine duration

To investigate the evapotranspiration and crop coefficient of oasis watermelon under water deficit (WD), mild (60%-70% field capacity, FC)and moderate (50%-60% FC) WD levels were set up at various growth stages watermelon, including seedling stage (SS), vine (VS), flowering fruiting (FS), expansion (ES), maturity (MS), with adequate supply (70%-80% during growing season as a control. A two-year (2020-2021) trial was carried out in Hexi area China to explore effect on characteristics sub-membrane drip irrigation. The results indicated that daily reference showed sawtooth fluctuation which extremely significantly positively correlated temperature, sunshine hours, wind speed. consumption entire varied from 281-323 mm (2020) 290-334 (2021), among phasic valued maximum ES, accounting for 37.85% 38.94% (2021) total, followed order VS, SS, MS, FS. intensity increased rapidly SS reaching 5.82 mm·d-1 after it gradually decreased. FS, MS 0.400 0.477, 0.550 0.771, 0.824 1.168, 0.910 1.247, 0.541 0.803, respectively. Any period reduced stage. And then relationship between LAI can be characterized better by an exponential regression, thereby establishing model estimating Nash efficiency 0.9 or more. Hence, demand differ different stages, reasonable irrigation control management measures need conducted conjunction requirements features each Also, this work aims provide theoretical basis desert oases cold arid environments.