如何提高磷肥、钾肥使用率（How to improve the utilization rate of phosphate fertilizer and fertilizer）.doc

如何提高磷肥、钾肥使用率（How to improve the utilization rate of phosphate fertilizer and fertilizer） How to improve the utilization rate of phosphate fertilizer and fertilizer The reporter understands from fertilizer soil testing and research center, in recent years, a lot of vegetable greenhouses, available k content of soil effective phosphorus excess phenomenon is very serious, not only caused serious waste of fertilizer, also affected the vegetables on the absorption of other nutrients, lead to problems such as malnutrition, especially in the winter season, the yield and quality of the vegetables be badly affected. In many cases, there is no shortage of micronutrients in the soil, but it is because of the excess of phosphate that is affecting other elements, especially in the deep winter season, which is prone to all kinds of deficiency symptoms. Vegetable production is high, the fertilizer requirement is big, but farmers current habits of fertilization has considerably more than the normal growth of the vegetables need, after several years of use, lead to soil environment worsening, salt injury problems, porous permeability difference, vegetable root growth affected by a lot. For example, the utilization rate of phosphate fertilizer is very low, generally only 10% to 20%, and easy to be fixed by soil after application. Fertilizer runoff is serious, and the soil of some large sheds is more than 2000mg/kg when tested. So how much of the potash fertilizer can be used to meet the needs of vegetables, and how can they be used to improve their utilization? A, p NPK plant growth and development of the three elements of nutrition, but for vegetables, the demand of phosphate fertilizer is relatively small, such as the majority of the solanaceous fruit and leaf vegetables vegetable species should be enough phosphorus to be nitrogen or to a third of the k content, most melons, root vegetables such as need and only the nitrogen or phosphorus amount to nearly half of the amount of pot