Abstract:

Through the datum of Guangzhou cropland soil monitoring plots from 2002 to 2008, the states of soil pH value, organic matter, total N, alkali-hydrolytic N, Olsen-P, NH4Ac-extractable K varied with the different fertilization systems and the curves of soil routine monitoring indexes were detected and analyzed. The results indicated that balanced fertilization of N,P,K (NPK treatment), especially when combined with manure (OC treatment), not only enable high and stable yields as we all know, but also had significant effects on maintaining or improving soil fertility; on the contrary, unbalanced fertilizations (NK treatment, NP treatment, PK treatment) not only make for “short board” effect on the yield, but make for worse unbalanced on the soil.