1施肥经过分析测定,每生产50千克籽棉,大约需要吸收纯氮2.25千克,五氧化二磷0.75千克,氧化钾2.25千克左右,对氧磷钾三要素的吸收比例大致为3:1:3。但还要注意的是产量越高,对钾的需要吸收就愈多。而从豫南棉田来看,由于近年来不注意施用钾肥,致使土壤中的钾素越来越少,同 Fertilization After analysis, 50 kg of seed cotton per production, about the need to absorb 2.25 kg of pure nitrogen, 0.75 kg of phosphorus pentoxide, potassium 2.25 kg or so, the absorption of oxygen and phosphorus three factors roughly 3: 1: 3 ratio. But also note that the higher the yield, the greater the need for potassium absorption. From the southern cotton field point of view, due to the lack of attention in recent years, the use of potash, resulting in less and less soil potassium, with