| In order to quantitatively analyse the relationship between the winter wheat leaf blade main geometrical parameter and organ biomass and specific leaf weight at pre-overwintering,the field experiments of different varieties and nitrogen application were carried out in 2013-2014 and 2014-2015 growth reasons of winter wheat. Jimai 22,Tainong 18,and Luyuan 502 were used as the experimental materials in this study. Simulation models of leaf blade main geometrical parameter of winter wheat at pre-overwintering were built by analyzing the relationship between the leaf blade length and leaf blade maximum width at pre-overwintering and organ biomass and specific leaf weight,and between the leaf blade tangent angle and leaf blade bowstring angle and specific leaf weight. The models were validated using independent experiment dataset. The results showed that root mean squared error (RMSE),mean absolute error (da),ratio of da to the mean observation (dap),and the determined coefficient (R) between simulated and measured values of leaf blade length,leaf maximum blade width,leaf blade tangent angle,and leaf blade bowstring angle were 1.453 cm (n=46),1.136 cm,11.997%,and 0.916,respectively; 0.093 cm (n=46),0.073 cm,13.396%,and 0.837,respectively; 23.906°(n=46),16.059°,52.153%,and 0.556,respectively; and 23.706°(n=46),19.818°,53.966%,and 0.787,respectively,with the significant level at 0.001. The simulated values agreed well with the measured ones. It is indicated that the winter wheat leaf blade geometrical parameter at pre-overwintering could be well simulated by these models. |
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