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一般作物在种子播入土中后,为了避免日晒、风吹,使幼苗发芽率高和生长发育良好,都要进行覆土。覆土厚度,一般说来都是以种子的大小和发芽时期的长短来决定,普通以不超过种子直径的3倍为相宜。但蔬菜的种类既多,栽培技术又很精细,除了考虑种子的大小外,还要研究下列条件。第一,种子发芽的重要条件是水分,播种时不仅注意土壤水分的含量多少,而且还要注意到蒸发量的大小,以决定种子覆土的厚薄。比如干燥的土壤,可在播种前,经过灌水来补
General crops in the soil after sowing, in order to avoid the sun, the wind, so that seedling germination rate is high and good growth and development, should be covered soil. Cover soil thickness, in general, are based on the size of the seed and the length of the germination period to decide, usually not more than 3 times the diameter of the seed is appropriate. However, there are many types of vegetables, cultivation techniques are very fine, in addition to considering the size of the seeds, but also to study the following conditions. First, seed germination is an important condition of water, planting not only pay attention to the amount of soil moisture content, but also pay attention to the size of evaporation to determine the thickness of seed covering soil. Such as dry soil, before sowing, after irrigation to make up