When the soil density is greater than 1.35g/m³ or the permeability coefficient is less than 10~4cm/s, measures such as expanding tree holes and loosening the soil should be taken.
When the soil compactness is greater than 1.35g/m ³ Or when the permeability coefficient is less than 10 ~ 4cm / s, measures such as expanding tree holes and loosening soil shall be taken.
When the soil compactness is greater than 1.35 g/m or the permeability coefficient is less than 10 ~ 4 cm/s, measures such as enlarging tree holes and loosening soil should be taken.