Abstract
In order to explore the validity of the single and dual crop coefficient approaches in sunlight greenhouses, eggplant with drip irrigation was taken as the study object, and the crop water requirement was calculated via field experiments in a sunlight greenhouse. Results indicated that the results of the two model simulations are satisfactory. Model parameters of the single crop coefficient approach are perfect with a correlation index (R2) of 0.8374, a regression coefficient of 0.8281, an average mean absolute error of 0.2335 mm/day, an average standard error of 0.28 mm/day, a consistency index of relative unbiasedness of 0.9530, and a residual variance of 0.0785. For the dual crop coefficient approach, the model parameters had a correlation index (R2) of 0.8597, a regression coefficient of 0.8220, an average mean absolute error of 0.2196 mm/day, an average standard error of 0.27 mm/day, a consistency index of relative unbiasedness of 0.9543, and a residual variance of 0.0685. The results indicated that the dual crop coefficient model was better than the single crop coefficient model. Our research can provide some reference for the study of crop water requirements with drip irrigation under mulch in a sunlight greenhouse.
Highlights
Irrigation management is significant for improving the environment, alleviating diseases and insect pests, and promoting yield and quality of greenhouse eggplant [1]
Water 2018, 10, 130 studies indicated that the dual crop coefficient method can provide a more precise approach of determining actual water requirements, and the single crop coefficient method was often used to estimate irrigation scheduling [6,7,8,9,10,11]
Gong et al [12] estimated soil evaporation and crop transpiration of tomatoes in a sunlight greenhouse by using the dual crop coefficient method under different water conditions, and the results indicated that the precision in high water treatment was higher than in low water treatment
Summary
Irrigation management is significant for improving the environment, alleviating diseases and insect pests, and promoting yield and quality of greenhouse eggplant [1]. Water 2018, 10, 130 studies indicated that the dual crop coefficient method can provide a more precise approach of determining actual water requirements, and the single crop coefficient method was often used to estimate irrigation scheduling [6,7,8,9,10,11]. Qiu et al [11] simulated the water consumption of tomato in a solar greenhouse using the dual crop coefficient method, indicating a good agreement between the simulated and measured values. Gong et al [12] estimated soil evaporation and crop transpiration of tomatoes in a sunlight greenhouse by using the dual crop coefficient method under different water conditions, and the results indicated that the precision in high water treatment was higher than in low water treatment. The results have laid a certain foundation for the calculation of the crop water requirement under drip irrigation in a sunlight greenhouse
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