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The prediction of excess nutrient solution volume was an essential part of re-used of nutrient solution system, and it was determined by volume of irrigation, substract, crop development stage and water content of substract. In order to found simulation model of excess nutrient solution volume, experiments were conducted at Venlo style greenhouse of jiangsu university on 4-11, 2013. Absorption of perlite and intercept of root of nutrient solution were studied, and a simulation model of excess nutrient solution was found. Other data from different experiment was used to validate the model. The result showed that the coefficients of determination between simulated and measured value based on the 1:1 line were 0.94, and the root mean squared error between the simulated and the measured value was 5.8 ml per plant. The model could give satisfactory prediction of excess nutrient solution volume. A simulation model of excess nutrient solution was firstly found and could afford theoretical guidance to design system of re-used nutrient solution.

Simulation of Excess Nutrient Solution Volume of Greenhouse Cucumber Under Soilless Culture