Evaluation On Soil Environmental Quality Of Apple Production Area In Jingning

Jingning county is one of the key counties of apple production in China.It is the first county of apple production in Gansu province.At present,apple planting area in this county has reached 66 thousand and 700 hm2.With the saturation of the domestic market,low price unsalable phenomenon began in 2014,has lasted for three years.But in the case of ordinary fruit unmarketable,green pollution-free fruit market has remained popular,Qiaoxiao situation.Therefore,it is of great practical significance to establish and improve the quality monitoring system of Apple pollution-free production environment in Jingning as soon as possible to improve the quality of apple and market competitiveness,meet the needs of consumers,and promote the healthy,rapid and sustainable development of apple industry.the scientific evaluation of soil environmental quality in orchard can provide the basis for the sustainable development of apple industry.From July 2015 to February 2016 in Jingning county during the apple production situation in-depth investigation,sampling in Jingning county apple main origin of investigated soil heavy mulch,irrigation and fertilization effects of Agronomic Measures on apple production,Rong town of Hulu River City Sichuan town to Granville 1200 hm2 orchard were set up to monitor pollution.The degree of the main monitoring soil.Using soil heavy metals such as pH and Cd,Hg,As,Pb,Cr and Cu as monitoring indexes,the pollution degree of soil was evaluated by single pollution index method and comprehensive pollution index method.The investigation and monitoring results show that the new planted apple soil heavy Jingning County,especially the new terraced soil heavy is one of the main factors affecting the growth and development of young trees;coverage measures help to overcome the adverse effects of climate drought apple production,in normal precipitation years,apple tree growth results meet the basic needs for free water for supplementary irrigation can,which is to prevent the sewage irrigation has a very important practical significance to prevent soil pollution caused,is a simple and effective method of soil pollution in orchard.A serious shortage of Jingning apple orchard organic fertilizer,chemical fertilizer dosage is insufficient,the consumption of soil nutrient is not a necessary complement,leading to soil nutrient imbalance,deterioration of soil physical and chemical properties,has become a prominent problem affecting the yield and quality of apple,rational fertilization is the future should focus on strengthening the County of static content in apple production.Show on behalf of Hulu river basin soil environmental quality monitoring results,monitoring of orchard soil mercury,cadmium,arsenic,lead,chromium pollution index was less than 1,the comprehensive pollution index was less than 0.7,the soil environmental quality is clean,conforms to the national standard of pollution-free production of apple.Jingning soil environmental quality based on the actual situation,put forward countermeasures and suggestions of Jingning county apple production without pollution,strengthen soil management,create loose fertile soil conditions;improve orchard coverage,reduce the frequency and amount of irrigation,reduce the risk of soil contamination,to maximize the maintenance of good environmental conditions of orchard soil;rational fertilization,balanced orchard soil nutrient supply;integrated pest control,the use of chemical pesticides.The above results have certain guiding significance for the pollution-free production of apple in Jingning county.