有機－無機肥料配合施用對(土婁)土的培肥效果

A long-term fertilization trail at the fixed site field was conducted for twelve years since 1990, aiming to research the effect of long-tern application of organic manure and chemical fertilizers on main fertilities (organic matter, total N, total P and total K, readily available N, readily available P and readily available K, bulk density, moisture capacity and porosity) in topsoil of loess soil. The results indicated that different chemical fertilizers with organic materials could improve fertility of loess soil in different degree. The treatments of M(H)NPK and M(N)NPK were more effective than SNPK and were characterized by significant increase of organic matters.