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。
Organic manure application favours the formation of Fe-humus complexes in purple paddy soils under water-dry rotation.
各种植物残体所形成的腐殖质，其性质基本相同。
Various kinds of humus derived from different plant residues are basically the same in nature.
各种植物残体所形成的腐殖质，其性质基本相同。
Various kinds of humus derived from different plant residues are basically the same in nature.
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