论文部分内容阅读
我们满怀信心播下去希望的种子却为何少苗、断苗、苗子瘦小病弱,我们百思不得其解,却原来是由于土表病菌的浸染和地下害虫的吞食对苗子的双重威胁。 长期以来,人类在不断的播种实践中,积累和发展了使用化学药品与农作物病、虫、鼠害作斗争的丰富经验。播种是农作物丰收的第一步,也是关键的一步。中国是最早使用农药防治农作物有害生物的国家,远在3000年前人们就知道用草木灰杀虫,用莽草熏杀蠹虫,国外公元前1500年古希腊和古罗马就在播种前使用含砷矿物粉杀虫。1744年法国人开始用硫酸铜消毒
We are confident to sow the seeds of hope, but why young seedlings, broken seedlings, thin skinny, we puzzled, but it was originally due to soil surface bacteria and underground pests swallowed the dual threat to the seedlings. For a long time, mankind has accumulated and developed rich experience in the fight against diseases, pests and rodents of crops by using chemicals in continuous sowing practices. Seeding is the first step in the harvest of crops and is also a crucial step. China was the first country to use pesticides to control pests of crops. As far back as 3000 years ago, people knew that pests were smoked with grass ash, and silver beetles were smoked with Mangcao. In 1500 BC, ancient Greece and Rome used arsenic minerals before sowing Powder insecticide. In 1744 the French began disinfection with copper sulfate