Effects of different ranges on the main causes of soil fertility (organic carbon, nitrogen, phosphorus, potassium) in the Hamedan province

Abstract: Understanding the changes in soil properties lead to better management of the land. One of the main goals of sustainable land management is to identify those management that in one hand cause to quantitative and qualitative improvements of the production in long-term an at the other hand maintain the quality of the soil without the negative effects of nutrient leaching is created nutrient loss, erosion and soil degradation. From the past two decades, in line with the sustainable management of land, in order to identification and to familiar with physical, chemical and biological functions of soils in different agricultural, rangelands and forests ecosystems, soil quality has been studied. In this study, three kinds of good pasture, medium and weak based on 4 factorial categories in a range were selected. Also in pastures with fourth factorial, pastures were divided into 3 types: 1. Good pasture. 2. Medium pastures 3. Poor pasture. Samples were taken from a depth of 0-20 cm and each one of good range, moderate, and weak were sampled in two slops of 0-12% and more than 12% with 5 replicate. The main factors of soil fertility on soils including O.c, P, N, K, were measured. Data were analyzed by two-way analysis of variance using spss software. Results showed that in good pastures, soil fertility characteristics has the highest amount of organic carbon, nitrogen, phosphorus and potassium and vegetation made explicitly clear its effect on soil and the conducive soil would be a ground to cover more desirable vegetation that this suggests the interaction of soil and plant with each other.