By taking clay soil in Binzhou as research objects

pot experiments were conducted in order to evaluate the effects of nutritive soil amendments on compacted soil. Soil bulk density

soil specific gravity

porosity and soil aggregate were investigated

and stability of soil aggregate were calculated to study the effects of NSA on characteristics and fractal dimension of clay soil aggregates. The result showed that NSA could decrease pH

soil bulk density and soil specific gravity

and increase porosity. NSA significantly increased the content of 0.5～1 mm and 0.25～0.5 mm soil aggregate

while significantly reduced the content of ＜0.05 mm soil aggregate. The amount of water-stable macroaggregates (R0.25) of 0.5% NSA and 1.0% NSA were significantly higher than the control (CK)

with an increase of 67.14 % and 141.58%. With soil amendments application

larger soil aggregates were formed to improve soil condition. Mean weight diameter (MWD)

geometric mean diameter (GMD) and fractal dimension (D) were significantly higher than the control

and the soil unstable aggregate index (ELT) decreased with amount of NSA which was the lowest in T3 treatment. The results indicated that applying NSA could improve surface soil structures through increasing water-stable macroaggregates contents and stability. This research provides academic and instructive bases for developing soil amendments.