紫外辐射增强对菠菜种子萌发及出苗的影响

研究了紫外辐射（UA－B）增强对圆叶和尖叶菠菜种子萌发出苗的影响，结果表明，UV－B辐射增强将显著降低圆叶菠菜种子的出牙率和出苗率，延缓发牙进程，出苗速度，影响幼长势，而对尖叶菠菜的影响较小，增强UV－B辐射还能有效抑制菠菜种子发牙时因病菌感染而发生的霉变，并减少幼苗期病虫害的蔓延和发展。

Influence of the ultraviolet radiation on both the spinach seed germination and the seedlings

The influences of the intensified Ultraviolet radiation (UV\|B radiation, 280~400m on both the seed germination and its emergence for both the round\|leaf and the angular\|leaf spinach are studied in the present article.It is found that the enhanced UV\|B tends to decrease both the germination percentage and the emergence rate of round\|leaf spinach by retarding the progress of seed germination and the timetable of seedlings and hence to influence the growth of the seedlings.The influences of extra UV\|B radiation on the angular spinach seeds are not noticeable.The intensified UV\|B radiation seems to effectively prevent the seed germination from the mildew caused by the bacteria.The damage caused by the harmful insects is also decreased when the UV\|B radiation is intensified.