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4.肥料与杂草防除肥料与杂草防除的关系表现在两个方面:一是没有腐熟的有机肥,往往给农田带来了大量的杂草种子。因为很多杂草种子具有休眠特性和高发芽势、耐高温、耐冰冻的特性,这些杂草种子随肥料进入农田造成危害。此外用草塘泥、河泥也往往把很多水生杂草的繁殖体种子带进了农田。另一方面使用无机肥的目的是促进农作物生长发育,如果作物种群一开始处于劣势的情况下施用化肥,由于杂草夺取肥料的能力比作物要强得多,反而助长了杂草。所以在这种情况下应该首先消灭杂草,再使用无机肥料。如若作物种群苗期生长正常,那么
4. Fertilizer and weed control Fertilizer and weed control relations in two aspects: First, no maturity of organic fertilizer, often to the farmland to bring a lot of weed seeds. Because many weed seeds have dormancy characteristics and high germination potential, high temperature resistance and freeze resistance, these weed seeds are harmful to the farmland with fertilizer. In addition, with grass and mud, river mud often brings the seeds of many aquatic weeds into the farmland. On the other hand, the purpose of using inorganic fertilizers is to promote the growth and development of crops. If the crop population is initially disadvantaged by applying chemical fertilizers, weeds are boosted because weeds seize fertilizer far better than crops. So in this case we should first eliminate weeds, then use inorganic fertilizers. If the crop seedlings grow normally, then