2005•T'u Jang T'ung PaoRequires access
Analysis of the Changing Characteristics of the Soil Fertilities in the Black Soil Area of Northeast China
Huang Jian
Open publisher page 3 citations
Abstract
Black soils distribute in the cultivated region in the Northeast Plain as well as its surrounding areas.People always pay much attention to the soil fertilities in the black soil area.The investigation in the typical county in the black soil area-Dehui City showed: As compared with those in 1980,the contents of soil 0rganic matter,total N,and available P in cultivated land were increased by 3.2,0.11 and 5.70mg kg~(-1),respectively,but the content of available K was decreased by 33.3 mg kg~(-1).The profits of soil organic matter,N,and P_2O_5 in 2003 were 48.7,15.07,25.35 kg hm~(-2),respectively,but the loss of K_2O was 170.62 kg hm~(-2).It seemed at present that the soil fertility conditions of the cultivated land in black soil area were not as bad as we thought.