玉米是喜温、喜光、喜水肥的短日照作物,对自然环境条件反应敏感。在海南冬种玉米过程中经历了与北方不同的自然环境条件,引起玉米生长习性的改变,性状表现也发生了不同程度的变化。其中较为严重的是自交系出现空秆现象,难以取得应有的预期结果。在玉米自交系南繁中,由于南繁基地的气候的异常变化,引起空秆现象比较严重,一般空秆率在30%～40%,最严重的地块达90%以上,给南繁育种工作造成 Maize is a short-day crop of hi-temperature, hi-light and hi-water, sensitive to the natural environment. During the process of Hainan winter maize, it experienced different natural environmental conditions with the north, caused changes of maize growth habit, and traits of maize also changed to some extent. The more serious is the phenomenon of empty stalk in inbred lines, it is difficult to obtain the expected results. In the southern propagation of maize inbred lines, due to the abnormal changes of the climate in the Nanfan base, the phenomenon of empty stalks is more serious. The average empty stalk rate is 30% ~ 40% and the most serious land is more than 90% Caused by the work