Long-term field experiment was established in 1978 on a coastal paddy soil to determine the effect of application of pig manure,rice straw and chemical N fertilizer on the physical property and humus characteristics o...Long-term field experiment was established in 1978 on a coastal paddy soil to determine the effect of application of pig manure,rice straw and chemical N fertilizer on the physical property and humus characteristics of soil.Results showed that the porosity,the microstructureal coefficient,the reactivities of organic C and N,the Δ logK value,the degree of oxidation stability,the contents of O-alkyl C and alky1 C,and the ratio of aliphatic C to aromatic C of humic acid from soils received organic manure increased;whereas,the ratio of <10μm to >10μm of microaggregates,the humification degree of humus,the degee of organo-mineral complexation,the number-average molecular weight,the C/H ratio,the contents of carboxyl and aromatic C of HAs in them decreased .These results indicated that the application of organic manure not only improved the physical property of the paddy soil but also made the HA more aliphatic in structure and yonger in origin.展开更多
文摘Long-term field experiment was established in 1978 on a coastal paddy soil to determine the effect of application of pig manure,rice straw and chemical N fertilizer on the physical property and humus characteristics of soil.Results showed that the porosity,the microstructureal coefficient,the reactivities of organic C and N,the Δ logK value,the degree of oxidation stability,the contents of O-alkyl C and alky1 C,and the ratio of aliphatic C to aromatic C of humic acid from soils received organic manure increased;whereas,the ratio of <10μm to >10μm of microaggregates,the humification degree of humus,the degee of organo-mineral complexation,the number-average molecular weight,the C/H ratio,the contents of carboxyl and aromatic C of HAs in them decreased .These results indicated that the application of organic manure not only improved the physical property of the paddy soil but also made the HA more aliphatic in structure and yonger in origin.
