1975年观察了夏玉米“京黄113”的某些生物学性状,该品种全生育期90日,叶数总计16片。在形态表现上,穗位叶及其上、下两叶是全株的最长、最大叶,叶鞘长以雌穗下、中部节位较长,节间长以雄穗节间最长,共出生8层根,以第7层根数较多,气生根只1层,总根数在65条左右。籽粒充实过程不同于春玉米,自始至终都在充实、增长中。提出以根、茎叶及穗、粒三个部分为对象,把叶片分为三组,各有主攻。相应探讨了以展开叶片数为栽培技术措施的外部形态指标的适用性。 In 1975, some biological traits of summer maize “Jinghuang 113” were observed. The whole growth period of this variety was 90 days with a total of 16 leaves. In terms of morphology, the ear leaves and their upper and lower leaves are the longest and the largest leaves of the whole plant. The leaf sheath is longer with the lower part of the ear and the middle section longer. The length of the internode is the longest Born eight layers of roots, to the seventh layer more roots, aerial root only 1 layer, the total number of 65 or so. The process of grain filling is different from that of spring corn, and it is full and growing all the time. Proposed root, stem and leaf and ear, grain three parts as the object, the leaves are divided into three groups, each with the main attack. Correspondingly, the applicability of the external morphological indexes of cultivating technical measures to expand leaf number was discussed.