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一、看叶脉,辨叶龄所谓“叶龄”,就是单株玉米主茎上展开的叶数(展开叶标准是:叶片从下部叶片中抽出,叶舌可见,叶鞘从叶环处向下开裂,略成小锐角,与下部叶片平行),植株自下而上按顺序展现的叶片数,称为第几叶龄。由于叶片的不断更新和死亡,给判定叶龄带来一困定难。在生产实践中,用叶脉数确定叶龄是个很好办法。以叶片的粗大中脉为准,不计中脉,第一叶(圆叶)的单侧为5条纤细叶脉,从第二叶起至第十叶片,单侧叶脉分别为4、5、6、7、8、9、10、11.12条。如果把中脉一侧的叶脉数
First, to see the veins, the age of the leaves to distinguish the so-called “leaf age”, that is, the number of leaves on the main stem of a single plant expansion (leaf standard is: leaves from the lower part of the leaves out, leaf tongue can be seen, , A little acute angle, parallel with the lower leaves), the number of leaves in the order from the bottom to the top of the plant, known as the first few leaf age. Due to the continuous updating and death of leaves, it is difficult to judge the leaf age. In production practice, the determination of leaf age by leaf number is a good idea. Regardless of the midrib, the unilateral veins of the first leaf (circular leaf) are 5 slender veins, from the second leaf to the tenth leaf, the unilateral veins are 4,5,6,7, 8,9,10,11.12. If the number of veins on one side of the veins