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玉米的叶脉由主脉和侧脉组成。由于各叶龄叶片上的叶脉呈一定规律出现,由此可以确定叶龄。而叶龄反映着内部穗分化进度,因此用叶脉确定叶龄后,便可预测花期相遇程度。用叶脉确定叶龄的方法是:把完全展开的一片叶向阳透视,数其主脉一侧的侧脉数,然后减去2,所得数即为该片叶的展开叶龄(第一叶除外)。穗位以上的叶片因出现二级叶脉,目测
Corn veins by the main veins and lateral veins. As the leaves of each leaf age veins showed a certain regularity, which can determine the leaf age. The leaf age reflects the progress of internal ear differentiation, so the determination of leaf age with leaf veins, we can predict the degree of flowering meet. The method of determining the leaf age by means of a leaf vein is to look at the completely unfolded leaf in the sun and count the number of lateral veins on one side of its main veins and then subtract 2 from the leaf age ). Ears above the leaves due to the emergence of two veins, visual inspection