Because of the distinction of soil property and humus content, soil water content is not ideal to indicate whether it is suitable to the growth of plant.
由于土壤性质和腐殖质含量的不同，土壤的含水量并不能很好地说明是否适宜植物的生长。
2
Organic manure application favours the formation of Fe-humus complexes in purple paddy soils under water-dry rotation.
在水旱轮作下，施用有机肥有利于紫色水稻土铁—腐殖质复合的形成。
3
This paper deals with the influence of a humus layer of different thicknesses on the water quality environment by measuring and analyzing the concentration of nitrogen nutritional salts.