摘要
对龙眼种子发芽期"顶枯"现象发生的规律进行了两年的调查和试验研究,结果表明,顶枯是太阳暴晒使土表温度剧升,烫伤幼芽所致的非传染性生理病害,其发生率高,危害严重;预防措施有搭阴棚遮荫、植物秸秆覆盖、间种遮荫植物等,经比较,认为播种龙眼前15d播种绿豆作遮荫植物效果最好,投资少,简便易行,值得推广。
Observation on the occurrence regularity of top die-back during the stage of longan seed germination has been carried out for over 2 years in field surveys and laboratory experimental research. It was found that top die-back was caused by the drastically rise of temperature of top soil which is exposed to the sun. The part of seedling which was contacted with the soil was burned. It is a physiological disease. The disease had a high rate of occurrence and with serious damage. The preventive measures include: shading by a shady shetter, covering with hay and growing intercrop as shading materials, ect. After comparison, it was found that among shading plants mung bean which was seeded at 15 days before the longan seeds were sowed had the best result for shading.
关键词
龙眼
种子
顶枯病
预防
发生规律
longan
seed
germination stage
top die-back
measures of prevention
