Archive > Volume 35 Issue 2 > 1998,35(2):227-234. DOI:10.11766/trxb199702110211 CSTR:[cstr] Prev Next
CHANGES OF SOIL MICROBIAL BIOMASS C, N AND P AND THE N TRANSFORMATION AFTER APPLICATION OF ORGANIC AND INORGANIC FERTILIZERS
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Abstract:
Experiments were carried out to study the changes of soil microbial biomass C, N and P and the transformation of N after application of organic and inorganic fertilizers by using isotope of 15N. The results showed that the soil microbial biomass C, N and P increased greatly after application of organic manures at the beginning of the experiment, and thereafter the biomass C decreased, but the biomass N and P remained constant. The immobilization of 15N rose to the highest about 10 days after application of 15N-labelled (NH)2SO4 and one month latter about 17% of the 15N was still in the soil microbes; when combined with organic manures the immobilization of 15N from (NH;), SOS increased. About 19-25% of 15N from the 15N-labelled organic manures was also immobilized in the microbes at the 30th day after application. In case (NH)2SO4 was applied alone the loss of N was about 18%, however, when combined with organic manure the loss decreased.
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