播种期对南方秋播糯玉米主要品质成分的影响

以鲜食型糯玉米品种香白糯为材料,于2004年秋在广州地区进行了分期播种试验,研究播种期对鲜食糯玉米籽粒灌浆期间主要品质成分及其变化规律的影响.结果表明,播种期没有明显改变糯玉米灌浆期间籽粒中主要品质成分的变化趋势,但对主要品质成分的含量影响很大.早播糯玉米灌浆期籽粒中可溶性蛋白、粗蛋白、脂肪、淀粉的平均含量分别比晚播的高0.87mg/g和2.68、1.0、4.96个百分点;其累积量分别比晚播的高0.74mg/粒、9.67mg/粒、2.3mg/粒和25.52mg/粒.早播糯玉米籽粒的含水量每天以1.37%的速率减少,其脱水速率高于晚播玉米籽粒的0.44个百分点.因此,南方（广州地区）秋播鲜食糯玉米的播种时间以适当早播（9月中上旬以前）、尽量推迟采收为宜.

Influence of Sowing Date on Main Components of Waxy Maize Sowed in Autumn in South China

The sowing date experiment of waxy maize,with a waxy maize hybrid variety Xiangbainuo,sowed in Autumn 2004 in Guangzhou was conducted to study the influence of sowing date on main quality components of wax maize during grain filling stage.The results showed that different sowing dates were not able to change the trend of main components,but it had greatly influenced on the contents of maize components.The average content of soluble protein,crude protein,fat and starch of waxy maize kernel in early sowing date(September 3) was higher than that of the late sowing date(September 23) by 0.87mg/g,2.68%,1.0% and 4.96% respectively.The average contents of maize grain's soluble protein,crude protein,fat and starch in early sowing date was higher than that of the late sowing date by 0.74mg/grain,9.67 mg/grain,2.3 mg/grain and 25.52 mg/grain respectively,while the seed water contents in early sowing date was declined by 1.37% each day after pollination,it was more quickly than that of the late sowing date by 0.44%.It was suggested that the suitable sowing date of waxy maize in Guangzhou was before the second week of September.