生态因素对玉米品种生长发育影响及调控的研究

通过播期、覆膜调控，研究了不同生态条件下不同类型玉米品种的生长特性，试验结果如下：不同生态条件下玉米生育期表现较大差异，温度是影响玉米生育期的主要生态因子；覆膜对生育期的影响达极显著水平，其影响作用 主要在玉米生育前期，开花期玉米根系数量和最大叶面积指数（LAI）与产量都达极显著正相关；相同播期条件下，掖单13号开花期根系数量和最大LAI大于登海1号品种，适宜生态条件下，玉米穗粒性状变异系数小，果穗发育整齐一致，掖单13穗长较大，易于形成大果穗，高产潜力大，但高温弱光条件下，穗粒性状变异系数大，空秆率高，果穗不整齐，产量低。

EFFECTS OF ECOLOGICAL FACTORS ON MAIZE(Zea mays L.)GROWTH OF DIFFERENT VARIETIES AND CORRESPONDING REGULATIVE MEASURE

Through the control of sowing date and plastic film, the growth perfomance of maize variety with different maturity under different ecological conditions was studied The results are as follows:The difference of maize growth duration under different ecological conditions is significant Temperature is the major factor affecting maize growth duration The function of plastic film on growth duration is very significant,and it embodies mostly in early stage Correlation of maize root number,LAI and grain yield at anthesis stage is significant At the same sowing date,the root number and LAI of Y13 at anthesis stage are greater than DH1 The variance coefficients of maize ear and seed performance are small and the ears are orderly under suitable ecological condition It is easy for variety of Y13 to form big ear with a high yielding potential But the variance coefficients of ear seed of Y13 are increasing under high temperature and deficient light condition,resulting in a high rate of empty stem,non-orderly ears and a low yield