Estimating Evapotranspiration of Greenhouse Tomato under Different Irrigation Levels Using a Modified Dual Crop Coefficient Model in Northeast China

Mingze Yao, Manman Gao, Jingkuan Wang (), Bo Li, Lizhen Mao, Mingyu Zhao, Zhanyang Xu, Hongfei Niu, Tieliang Wang, Lei Sun and Dongshuang Niu
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Mingze Yao: College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
Manman Gao: College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China
Jingkuan Wang: College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
Bo Li: College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China
Lizhen Mao: Department of Foreign Languages Teaching, Shenyang Agricultural University, Shenyang 110866, China
Mingyu Zhao: College of Energy and Water Resources, Shenyang Institute of Technology, Fushun 113122, China
Zhanyang Xu: College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China
Hongfei Niu: College of Hydraulic Engineering, Liaoning Vocational College of Ecological Engineering, Shenyang 110122, China
Tieliang Wang: College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China
Lei Sun: College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China
Dongshuang Niu: College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China

Agriculture, 2023, vol. 13, issue 9, 1-19

Abstract: Accurate quantification of evapotranspiration (ET c ) and its components are critical for enhancing water use efficiency and implementing precision irrigation. A two-year experiment was conducted for greenhouse-grown tomatoes under mulched drip irrigation with three irrigation treatments during 2020–2021 in Northeast China. Three different irrigation treatments were applied by setting upper and lower soil moisture irrigation thresholds (i.e., W1, 65%θ FC –75%θ FC , W2, 75%θ FC –85%θ FC , W3, 85%θFC–95%θ FC , respectively, where θ FC is field capacity). In this study, a modified dual crop coefficient ( K c ) model was proposed to simulate daily ET c , plant transpiration (T r ) and soil evaporation (E s ). The simulations of the model were validated against observed data from the sap flow system combined with the soil water balance method. The controlling factors on the variations of evapotranspiration and its components were also identified by using the path analysis method. Results showed that the modified dual K c model can accurately simulate daily ET c , E s , and T r for the greenhouse tomato under different irrigation conditions, with the coefficients of determination ranging from 0.88 to 0.98 and the index of agreement higher than 0.90. The seasonal cumulative ET c of tomato for W1–W3 were 138.5–194.4 mm, of which 9.5–15.8% was consumed by E s . Path analysis showed that the net radiation ( R n ) was the dominant factor controlling the variations of T r and ET c during the growing seasons. The canopy coverage degree ( K cc ) was the dominant controlling factor of E s , while the temperature ( T a ) was the primary limiting factor affecting E s . This study can provide reference information for developing proper irrigation management in a greenhouse-grown tomato in the north cold climate regions.

Keywords: modified dual crop coefficient model; crop coefficients; evapotranspiration partition; controlling factors (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
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