A model for predicting dry matter partitioning in barley.

Based on time-course observations on the dry matter partitioning and remobilization under varied nitrogen rates regimes with different cultivars,a dynamic model was developed to simulate the dry matter partitioning in barley.The latent partitioning index of leaf,stem and grain,which were the variety heredity parameters,were used to distinguish the difference of the dry matter partitioning in different variety.The dynamic content of the dry matter partitioning index could be described with a Richards model;The dynamic content of the dry matter partitioning of stem could be described with two Richards models,which solved connection well.The Nitrogen influence factor was used in the model.The latent critical nitrogen content and the latent smallest nitrogen content,which were the variety heredity parameters,were used to expresse the effect of nitrogen on the dry matter partitioning in different variety.The model was validated with independent experiment data.The results showed that the Absolute prediction error ranges for the dry matter partitioning of leaf,stem,spike and grain were 0.001～0.252 kg·m-2,and RMSEs were 0.007～0.186 kg·m-2.The present model appears to provide a reliable prediction.