4种土壤的养分供给特性及烟株对肥料的利用率研究

采用温室盆栽，研究了4种土壤的养分供给特性及烟株对肥料的利用率。结果表明，石灰岩类土壤提供给烟株吸收利用的氮养分较多，而磷钾养分较少。紫色类土壤提供给烟株吸收利用的磷钾养分较多，而氮养分较少。土壤中速效磷含量与烟株对肥料磷的利用呈负相关，与对氮的利用呈正相关。烟株对4种土壤中的速效磷利用率都很低。如果土壤中有较高的速效磷(高于40mg/kg以上)，则施磷变得意义不大。如果土壤中速效磷在30-40mg/kg以下，则可减少磷的施用量，氮：磷以1：0.5为宜。

Study on nutrition property of four kinds of soil and utilization rates of fertilizer

Study on nutrition property of four kinds of soil and plants utilization rate of fertilizer was carried out through potted plants.The results showed that lime soil supplied the plants with more nitrogen nutrition,less phosphorus and potassium nutrition.Purple soil supplied the plants with more phosphorus and potassium nutrition and less nitrogen nutrition.Quickly released phosphorus content of soil was nega-tively correlated with plants utilization rate of phosphorus,while positively correlated with nitrogen utiliza-tion.The uti lization rates of plants to quickly released phosphorus in four kinds of soils were low.If the content of quickly released phosphorus of soil is higher(over40mg /kg),then applying phosphorus fertilizer is not necessary.If it is low(30-40mg /kg),then the amount of phosphorus applied may be reduced and the ra tio of nitrogen to phosphorus had better be1:0.5.