Late-lying snow reduces the effective growing season to the point where seedlings cannot establish themselves.

迟来的积雪将有效的生长季节缩短至某一程度，使得幼苗无法自行生长。

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The effective period is double. So the shortage of N in the late stages of growing season has been compensated.

肥效期比普通碳铵延长一倍左右，有效地弥补了普通碳铵后期脱肥的不足。

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