Evaluating St for the second phase is a little more difficult for this particularcrop because the Xt curve has a peculiar shape to which it is difficult to fitan analytical curve A hand-drawn curve wa
对于这种特定作物，评估第二阶段的S(t)要困难一些，因为X(t)曲线具有一种奇特的形状，很难拟合出解析曲线。手绘曲线进行拟合，并通过数值方法计算方程（13b）所需的微分。
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