Analysis on the Status Quo and Changes of Orchard Soil Quality in Hebei Province

A survey on the status quo and change reasons of 1 200 orchards′ soil quality was carried out in Hebei province.The results showed that the content of orchard soil organic matter was low and the 71% soil samples′ contents were low and lack;the soil phosphorus was accumulated,the 46% soil samples′ contents were abundant,the abundance contents were 2.2-7.7 times as orchard soil phosphorus environment critical value(50 mg/kg),high phosphorus content would exist high environment risk;the soil potassium was insufficient relatively,the over 58% soil samples′contents were low and lack;the contents of Fe and Cu were enough,the contents of Zn and B were medium,the contents of Mn and Mo were low,the 70%-90% soil samples′available copper contents were plenty in several orchards,these samples′ contents were 2-5 times as abundance content standard(1 mg/kg),the highest soil copper contents were 1-2 times as contamination critical value(15 mg/kg);about 20% orchard soil occurred acidification.Moreover,the research indicated that the important reasons on orchard soil quality changes were deficient in organic nutrient application,nitrogen and phosphorus fertilizers′ excessive application,relatively lack in potassium fertilizer use,excessive in copper bactericides use and so on.Finally,it pointed out that the important aspects of orchard soil quality research in the future were orchard soil fertility improvement,non-point source contamination of nitrogen and phosphorus,soil copper excessive accumulation and acidification problem.