| In recent years,the rapid development of agriculture,the organic fertilizer and the overuse of chemical fertilizer is particularly highlighted.Characteristics of soil fertility,soil nutrient classification has important significance for reasonable fertilization,based on the Tieling County Soil Physical and chemical indicators were measured,mastered the area soil nutrient fertility,the nutrient classification in this area and the mapping of soil nutrient classification map of the project area,and formulates the fertilization scheme the area is of great significance,reasonable fertilization in this area.The results showed out that(1)The average content of soil organic matter was 2.01%and most of the area was still in the short and medium conditions with the area of short conditions declining.(2)The average total nitrogen content was 1.16g/kg,and the second soil survey results slightly rise,also in the middle and lower level status than the lack of area decreased,the area above medium state proportion is increasing.(3)The average effective phosphorus content was 50.86mg/kg,which was obviously increased compared with the results of the second Soil Census,most of them were rich and rich,and the rest of them reached medium level.(4)The average content of available potassium is 119.6mg/kg,which is obviously lower than that of the second Soil Census.Most of the area is in the middle and less,and the area is relatively large.On this basis,the paper summarizes the comprehensive situation of soil nutrients in the study area,and finally puts forward the reasonable fertilization model of maize and rice,in order to provide technical support for improving the level of soil nutrients and grain yield in Tieling. |
