根据对棉花植株的化学分析,从空气和水分中吸取而来的碳、氢、氧三元素占总量的95％,而其他5％是由土壤中吸收的各种元素,如氮1.4％,磷0.3％,钾1.5％,另外还有钙、镁、铁、硫、铝、硅、氯等含量较大的元素,以及硼、锌、锰、铜等微量元素。这些矿物元素虽然只占全株的5％左右,但对棉花的生长发育和产量起着非常重要的作用,是不可代替,不能缺少的。在这些矿物元素中,以氮、磷、钾三元素在棉株中含量较多,而土壤中所含的数量又远远不能满足丰产的需要。因此要棉花丰收,就需要 According to the chemical analysis of cotton plants, the three elements of carbon, hydrogen and oxygen extracted from air and water accounted for 95% of the total, while the other 5% were all kinds of elements absorbed by the soil, such as 1.4% of nitrogen, Phosphorus 0.3%, potassium 1.5%, in addition to calcium, magnesium, iron, sulfur, aluminum, silicon, chlorine and other larger elements, and boron, zinc, manganese, copper and other trace elements. Although these mineral elements only account for about 5% of the whole plant, they play an important role in the growth and yield of cotton and are irreplaceable and indispensable. Among these mineral elements, nitrogen, phosphorus and potassium three elements in the cotton content is more, and the amount contained in the soil and far can not meet the needs of high yield. Therefore, cotton harvest, we need