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。

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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。

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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.

通过对不同厚度淤泥水中氮营养盐的测定和分析，初步研究了不同厚度淤泥对水族箱水质环境中氮营养盐的影响。

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