Investigation of the Nutrient Status in the Soil along Highway and its Limited Faclor

Chemical analysis was used to study the nutrient status in the soil along highway and limited factors in the suburb of Xinyang. The results showed that all those soil samples were deficient in organic materials and N,and most of them deficient in P and rich in K. Therefore,we should ensure the need of the plants with frequent and adequate fertilization while the application rate of organic fertilizer,nitrogen and phosphate fertilizer was increased and the application rate of potash fertilizer was decreased according to soil nutrient status,nutrient requirement of plants and their adverse environmental effects.