Parameter estimates for mixed non-linear models (spring period) describing the effects of the day of year on parameters a, b and c of the curves describing pasture yield (Gaussian model).

Significances are based on likelihood-ratio tests. Interaction between sand classes (SC I, II and III) and growing degree days corresponding to b (GDDb) was included as a fixed effect on parameters b and c.显著性结果基于似然比检验（likelihood-ratio tests）得到。砂粒等级（sand classes，SC）I、II和III与对应参数b的生长度日（growing degree days corresponding to b，GDDb）之间的交互作用，被作为参数b与c的固定效应纳入统计模型。