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新疆土壤母质含钾丰富,长期以来人们只注重氮、磷肥的施用,钾素营养一直未引起重视。随着农业生产的发展,作物产量不断提高,土壤中的钾一直处在带走多、归还少的状态,且外源钾肥几乎没有。针对这一情况,弄清垦区农田土壤中钾的状况,研究当前棉化对施用钾肥的肥效,对促进垦区棉花生产的发展,是极其有意义的。 土壤钾素状况 据全师1982年第二次土壤普查统计,土壤耕层速效钾(K,下同)含量平均为337mg/kg,速效钾含量在200mg/kg以上,占耕地面积的60.47％;<50mg/kg的占1.98％;50～100mg/kg的占
Xinjiang soil rich in potassium parent material, for a long time people only focus on the application of nitrogen and phosphate fertilizer, potassium nutrition has not been given attention. With the development of agricultural production, crop yields are continuously increasing. Potassium in soils has been taking away more and returning less, and there is almost no exogenous potassium fertilizer. In view of this situation, it is of great significance to understand the status of potassium in farmland soil in reclamation area, study the effect of current cotton paddy on the application of potash fertilizer, and promote the development of cotton production in reclamation area. Status of Potassium in Soil According to the statistics of the Second National Census in 1982, the average content of available potassium (K, the same below) in soil topsoil was 337mg / kg and the available potassium was above 200mg / kg, accounting for 60.47% of the area of cultivated land. <50mg / kg accounted for 1.98%; 50 ~ 100mg / kg accounted for