colour degree coefficient of humic acid

high stability coefficient

High stability coefficient method

implicit expression of stability coefficient

oxidation stability coefficient

stability coefficient

Stability coefficient against overturning

Stability coefficient against sliding

stability coefficient of slope

yield increase stability coefficient YSIC

a humic acid

agricultural humic acid

Application of Humic Acid Fertilizer

b humic acid

b humic acid b

bio-active humic acid

bio-chemical humic acid

Biological humic acid

brown humic acid