Evaluation on black soil nutrients and fertilization recommendation in Dehui City

A comprehensive evaluation on black soil nutrients was conducted with five indexes.The results show that the available K and CEC are abundant,available P and organic matter are medium and total N content is lack,pH is different among every plots. Nutrient preserving capability and fertilizer response are fine,but soil fertility degrades seriously.Thus,more manure,increased N,controlled P,retained K,and a suitable amount of trace element fertilizer should be applied in Dehui City to keep the sustainable productivity of black soil.