期刊
WATER
卷 14, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/w14192959
关键词
greenhouse-grown eggplant; reference crop evapotranspiration; weighing lysimeter; daily evapotranspiration; crop coefficient
资金
- S&T Program of Hebei [21326904D, 21327005D]
This study investigated the crop coefficient method for estimating evapotranspiration in greenhouse-grown eggplant and found that it accurately estimated daily ETc. Compared to the FAO-56 recommended K-c value, the adjusted K-c values based on local climate were significantly lower. Therefore, the crop coefficient method can serve as a useful tool to improve water use efficiency.
Accurate estimation of crop evapotranspiration (ETc) is important to determine crop water requirements in greenhouse agriculture and to improve the irrigation water use efficiency. Here, a 3-year (2017-2019) experiment with spring greenhouse-grown eggplant (Solanum melongena L.) was conducted to investigate variation in the crop coefficient (K-c) measured with a weighing lysimeter, adjust K-c based on the local climate (K-c,K-Adj), and estimate daily ETc using a crop coefficient model. The 3-years mean local K-c (K-c,K-Loc) were 0.23 +/- 0.03, 0.62 +/- 0.06, 1.05 +/- 0.03 and 0.87 +/- 0.03 at the initial, development, mid-season, and end-season stages, respectively. Significant linear correlation was observed between K-c,K-Adj and K-c,K-Loc in the 3 years (R-2 = 0.873, 0.901, and 0.897 in 2017-2019, respectively). Compared with the FAO-56 recommended K-c value (K-c,K-FAO), the mean K-c,K-Adj and K-c,K-Loc in the 3 years were by 66.3% and 61.8% lower, respectively. The single crop coefficient model accurately estimated daily ETc for greenhouse-grown eggplant. The coefficient of determination (R-2), mean absolute error (MAE), root-mean-squared error (RMSE), and index of agreement between measured ETc and that estimated by the single crop coefficient model were 0.94, 0.35 mm.d(-1), 0.26 mm.d(-1), and 0.98, respectively, for the means in 2018 and 2019. Therefore, the crop coefficient method reliably estimated evapotranspiration with adjustment for the actual environment and can serve as a useful tool to improve water use efficiency.
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