Evaluation And Investigation Of Soil Nutrients And Farmland Fertility In Wenquan County Of Bozhou

?Object & Method?Cultivated land is the important resources for agricultural production.Wenquan County is a major grain-producing area in Bozhou,Xijiang province.With the changes of tillage practice and planting structure,the soil fertility level has been changed greatly in recent years.In order to understand the change of soil nutrient and farmland fertility in Wenquan County,the contents of soil organic matter and available nutrient were investigated from 2006 to 2015.Moreover,ten factors(such as soil organic matter,available nutrient,etc)were selected as evaluation indicator,and then using analytic hierarchy process(AHP)method to calculate the combination weight of evaluation factors.The farmland fertility was evaluated using an additive model to calculate comprehensive index of farmland productivity.This study could provide a theoretical basis to promote the farmland quality construction and sustainable development of agricultural production of Wenquan County.?Result?(1)Soil organic matter,available nitrogen and available phosphorus showed an increase trend form 2006 to 2015.The average contents of soil organic matter,available nitrogen and available phosphorus were 12.81%,18.89%,and 25.30% in 2015 higher than those in 2006,respectively.The average contents of soil available phosphorus had a significantly increase due to phosphate fertilizer continuous excessive application.Soil available potassium content reduced sharply from 2006 to 2015.The average content of soil available potassium in 2015 was 44.86% lower than in 2006.(2)The coefficient of variation(CV)of soil organic matter,available nitrogen and available phosphorus belonged to the moderate variability.The CV value of available phosphorus was 73.29%,which was the largest in all the soil nutrient parameters.(3)The content of soil organic matter in Wenquan County mainly ranged from 16.5 to 20 g/kg.The order of soil organic matter in different districts was West > Central > East.The content of soil available nitrogen mainly ranged from 70 to 85 mg/kg.The content of soil available nitrogen in different districts followed as West > East.The content of soil available phosphorus mainly ranged from 9 to 13 mg/kg.The order of soil available phosphorus in different districts was East > West > Central.Soil available potassium content mainly ranged from 219 to 350 mg/kg.The content of soil available nitrogen in different districts followed as Central > East > West.(4)The fertility of farmland in Wenquan County was divided into five grades.The area of first-grade land is 2411.11 ha,accounting for 10.05% of the whole county farmland.The second-grade land area is 5109.07 ha,accounted for 21.29% of farmland.The area of third-grade of farmland is 10133.43 ha,accounting for 42.22% of the total farmland.The area of fourth-grade is 5513.99 ha,accounting for 22.97% of the total farmland.The fifth-grade farmland area is 833.74 ha,accounting for 3.47% of the total farmland.?Conclusion?Well-facilitated farmland construction and farmland quality promotion is the basis of sustainable development of agriculture.Based on the eco-environmental conditions and character of farmland fertility,the strategy and suggestion of farmland fertility quality construction were proposed as follow:(1)first-and second-grade farmland were built-up to the well-facilitated farmland through enhancing the farmland infrastructure;(2)third-and fourth-grade farmland were built-up to the stable basic farmland via soil fertility improvement measures,including organic fertilizer application,drip irrigation,crop-grass rotation,and so on;(3)fifth-grade farmland should be converted into forest or grassland to strengthen the ecological environmental protection.