半紧凑型春玉米的产量与叶片性状

Yield and Leaf Characteristics of the Half Close Plant Type of Hybrid Spring Corn

在华南农业大学教学试验场栽植粤顶９号玉米按４５万株／ｈｍ２与６７５万株／ｈｍ２２种密度，结果表明低密度下穗粒性状有改善的趋势，但未达到显著程度植株总叶龄变异较小，叶面积与干物质的增长呈指数曲线生长期内低密度植株净化同化率后期较高各叶长宽呈现明显的抛物线规律叶面积最大叶位为第１２与第１３叶，中后期各叶出叶间隔在３ｄ左右，展开间隔在２ｄ左右，衰老间隔为５～１０ｄ。

The leaf characteristics of hybrid corn (yuedin 9) for different planting densities were tested in the experimental farm of South China Agricultural University in Guangzhou China in the spring of 1996. The corn yield characteristics were better in the density of 45 thousand plants per hectare than in the density of 67 5 thousand plants, but that was not reach a singificant level. The total leaf age of the tested hybrid corn was 19.1 and also was a rather stable character. The relationship between the leaf area and the dry matter inerement showed index cure. The plants of low density, population had higher assimilation rate in the late growing stage. The long wide rate of leaf showed parabola cure. The longest and widest leaf was 12th leaf and 13th leaf, which were unfolded at the young panicle differentiation stage. Every other leaf appeared in 3 days and unfolded in 2 days in the middle and late growth period, but senecensed in 5 to 10 days. The function days of leaves would extend with leaf arrangement.