论文部分内容阅读
在伊克昭盟,每当6月底至8月初便发生樟子松死苗。从状态看,很像病原菌引起的猝倒病。但按此病施药并不见效,松苗照样倒伏死亡。这到底是什么原因?通过近几年育苗观察,发现早晨苗还生气勃勃,高温的中午之后,就出现倒伏死亡。据调查,中午地面温度55℃时,死苗达14.7%;49.5℃时,死苗达11.3%;42℃时死苗9.3%;38℃时,死苗1.7%。中午温度越高,死苗越严重。由此,找出了樟子松苗在夏季死亡的原因不是病原菌引起的,而是地面高温灼伤造成。所以,应采
In Iqqun League, whenever the end of June to early August will occur Pinus sylvestris seedlings. From the state, much like the damping-off caused by pathogens. However, according to the disease applied is not effective, pine seedlings are still lodging death. In the end what is the reason? Through the observation of nursery in recent years, found that seedlings are still fresh in the morning, noon after high temperatures, the emergence of lodging death. According to the survey, dead seedlings reached 14.7% at noon ground temperature of 55 ° C; dead seedlings reached 11.3% at 49.5 ° C; dead seedlings reached 9.3% at 42 ° C; and 1.7% of dead seedlings at 38 ° C. The higher the temperature at noon, dead seedlings more serious. Thus, it is found that the cause of death of Pinus sylvestris seedlings in summer is not caused by pathogenic bacteria but caused by burns on the ground at high temperature. So, should adopt