Research On Evaluation Quality Of Black Soil Farmland In Nenjiang County

Black soil of arable land is scarce resources of the world,The extremely precious land resources,its character is good,high fertility,able to provide good environment for the growth of crops.However,due to the Nenjiang county black soil farmland for a long time didn’t get reasonable use,the land development process too fast,a lot of use of low-quality fertilizers,leading to the area of cultivated land degradation of black soil increasing,land quality is declining,productivity gradually become low,cause blow to the northeast granary "food security".Therefore,how to improve the quality of black soil of arable land,to curb the trend of cultivated land degradation of black soil,restore the black soil of arable land fertility,improve the black soil farmland total grain output,establish to adapt to the benign ecological environment for the sustainable development of black soil of arable land,has become a urgent problem.The black soil of arable land at home and abroad,the article discusses the status of domestic research on black soil of arable land is still in its infancy,the study area of cultivated land quality evaluation is limited to some higher attention hot spot region and weaker region,and in black soil area as the study area,combined with its natural,ecological,economic and technical factors to study this problem is still blank.So this article on the basis of development trend,collect and organize the existing black soil of cultivated land quality evaluation theory and method,in view of the situation of the Nenjiang county of Heilongjiang province,according to the "pressure-state-response"(PSR)model,the black soil surrounding the Nenjiang county cultivated land resources,build a targeted area black soil of cultivated land quality evaluation index system,through the analytic hierarchy process(AHP)to determine the index weight,use of fuzzy comprehensive evaluation model fitting membership function,application of accumulative method to calculate comprehensive index of black soil of arable land quality,determine the black soil of arable land quality grade.Main conclusions are as follows:(1)Based on the Nenjiang county black soil farmland quality index,according to the real condition of Nenjiang county to Nenjiang county black soil farmland quality is divided into four grades.Among them,the level of black soil in the cultivated land area of 41006.7 hm2 47.8%of the total area of the county black soil of arable land,mainly distributed in Iraq,Haijiang,has paid,luen hing township,in a thick layer of sticky soil type to black soil,meadow black soil is given priority to;Secondary black soil land area of 33200 hm2,38.7%of the total area of the county black soil of arable land,are mainly distributed in Nenjiang river town,long town,villages and towns,such as soil type is given priority to with middle black soil;Level 3 in black soil of cultivated land area of 9440.0 hm2,11%of the total area of the county black soil of arable land,are mainly distributed in BaiYun Township,soil type is given priority to with middle black soil;Level 4 in black soil of cultivated land area of 2146.7 hm2,2.5%of the total area of the county black soil of arable land,are mainly distributed in tower creek township.(2)The county-wide average black soil farmland soil organic matter content is 53.36 g/kg;Availabale nutrients,average in 69.4 mg/kg,available p in soil at higher levels,effective molybdenum at low levels,in 0.15 mg/kg on average.Available k content in low and middle level on average,an average of 168.0 mg/kg.Effective boron low at 0.34 mg/kg on average.Between soil pH range of 4.9 to 4.9,with an average of 5.6.pH value is greater than 6.5 soil accounted for 0.2%of overall,slightly acidic soil accounted for 99.8%of total soil.(3)This paper sum up the above research results,combined with the actual situation of Nenjiang county,from the quality of the construction of the agricultural cultivated land,cultivated land quality of the construction of the engineering measures and suggestions of advice,cultivated land quality monitoring system building,the guidance of the quality of the construction of the management system,etc,the suggestions of improving the quality of black soil of arable land.Hope through the above analysis and countermeasures and Suggestions,to our country northeast black soil of arable land protection and development,agricultural sustainable development of targeted recommendations.