Effects of Long-Term Located Fertilization on the Contents and Composition of Organic Matter in Paddy Soil

doi:10.11924/j.issn.1000-6850.2014-0813

Abstract

Abstract: To reveal variation of organic matter content in red paddy soil, through a 27- years- located fertilization experiment in red paddy soil, the content and composition of organic matter in paddy soil were studied in this paper. The results showed that: the dynamics of soil organic matter of the different fertilization treatments had significant differences, In the premise of equal nutrient (Nitrogen and Phosphorus and Kalium), combined application of organic-inorganic treatments benefited the accumulation of organic matter in paddy soil than non-fertilizer treatment or chemical fertilizer treatment; the dynamics of soil humic acid, HA and FA of chemical fertilizer only and combined application of organic-inorganic treatments had basically the same trend, but the contents of humic acid, HA and FA of combined application of organic-inorganic treatments had been higher than that of non-fertilizer and chemical fertilizer treatment. Moreover, combined application of organic- inorganic treatments benefited the improvement of the contents of HA and FA, but HA/FA ratio decreased with the extension of time. Combined application of organic- inorganic treatments benefited the improvement of the contents of readily oxidizable O.M; and the contents of soil organic matter in long-term experiment and the contents of readily oxidizable O.M had highly significant positive correlation and the contents of soil total nitrogen, avail nitrogen and potassium had significant positive correlation; the contents of soil readily oxidizable O.M and the contents of soil total nitrogen, avail P and rice yield had significant positive correlation. Thereinto, the correlation (r=0.8181*) between the rice yield and soil readily oxidizable O.M was higher than the correlation (r=0.8020) between the rice yield and soil organic matter. It showed that the soil readily oxidized organic matter had greater contribution to the rice yield.

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