Simulation of cucumber organ above-ground with relation to light and temperature

The objective of the study was to construct a simulation model with morphological characters on TEP (product of thermal effectiveness and PAR) and logistic equation. An experiment for model establishment was conducted using one cultivar (Qingjin #4) with three repeat. Morphological characteristic parameter of leaf, the lengths and diameters of petiole, internode, fruit and main stem were determined. The model was validated with independent experiment data. The results showed that the simulated values agreed well with the measured ones: 1) The determined coefficient (R2) and root mean squared error(RMSE) between the simulated and measured values of morphological characteristic parameters of leaf (L1, L2, L3) were 0.92、0.91、0.95 and 8.5, 6.9, 2.8 mm, respectively; 2) The determined coefficient (R2) and root mean squared error (RMSE) between the simulated and measured values of the length and diameter of petiole was 0.89, 0.93 and 5.6, 0.3 mm respectively; 3) The determined coefficient (R2) and root mean squared error (RMSE) between the simulated and measured values of the length and diameter of internode were 0.87, 0.91 and 4.5, 0.8 mm respectively; 4) The determined coefficient (R2) and root mean squared error (RMSE) between the simulated and measured values of the length and diameter of internode was 0.75 and 120 mm respectively; 5) The determined coefficient (R2) and root mean squared error (RMSE) between the simulated and measured values of the length and diameter of fruit were 0.86, 0.92 and 8.2, 2.4 mm respectively. The results indicate that the presented model has a good performance in predicting the dynamics of each organ of cucumber above-ground in growth process. Based on the model, a visual plant model can be constructed easily.