Open AccessTítulo en español.
Author(s) -
H. D. Dubey,
Rita L. Rodríguez
Publication year - 1974
Publication title -
the journal of agriculture of the university of puerto rico/the journal of agriculture of the university of puerto rico
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 10
eISSN - 2308-1759
pISSN - 0041-994X
DOI - 10.46429/jaupr.v58i1.10705
Subject(s) - humanities , biology , philosophy
Changes in soil microorganisms following applications of 2,4-dichloro- 6-(o-cloroaniline)-s-triazine (Dyrene) and manganese ethylene bisdithiocarbamate (Maneb) at 0, 60, 240, and 960 ppm to the acid lateritic Humatas clay and the alkaline fertile San Anton loam incubated at 23° ± 1°C were studied for 18 months in the laboratory. In general, bacterial numbers increased and actinomycetes and fungi decreased especially at higher concentrations of the chemicals. The bacterial increase disappeared at the 10-month count but persisted longer at the 960 ppm rate of Maneb. Bacteria seem to be the principal microorganisms responsible for degradation of these fungicides in the soil. Maneb caused qualitative as well as quantitative changes in the fungal population. Microorganisms in the two soils differed in their response to the chemical treatment. Inhibition of the microorganisms was offset by inoculation with fresh soil.