title: [Studies on the effects of atrazine and simazine on the N-binding bacteria Azotobacter and Beijerinckia in the ferralitic soils of Cuba].
abstract: In two Cuban locations (Santiago de las Vegas and Jovellanos) the effect was investigated of increasing atrazin and simazin applications (0, 4, 8, 16 kg/ha) to the number of Azotobacter and Beijerinckia colonies in weakly ferrallitic soils 7 and 15 days after their application during the rainy and dry seasons. The results were as follows: 1. The number of the Beijerinckia colonies is higher in all variants than that of Azotobacter. 2. Beijerinckia and Azotobacter are stimulated up to 7 days, partly also up to 15 days, after application of the triazins. Atrazin exhibits a stronger and more lasting effect than simazin, and Azotobacter are influenced more strongly than Beijerinckia. 3. This stimulation can be adduced with a high degree of probability to the inhibition of organisms which have an antagonistic effect on N-binding bacteria.
mesh_terms: D001280:Atrazine / Q000494:pharmacology*; D001395:Azotobacter / Q000187:drug effects; D003462:Cuba; D006540:Herbicides / Q000494:pharmacology*; D007501:Iron; D011548:Pseudomonadaceae / Q000187:drug effects*; D012839:Simazine / Q000494:pharmacology*; D012988:Soil Microbiology; D014329:Tropical Climate
chemical_list: D006540:Herbicides; D007501:Iron; D001280:Atrazine; D012839:Simazine
vernacular_title: Untersuchungen über den Einfluss von Atrazin und Simazin auf die N-bin-denden Bakterien Azotobacter und Beijerinckia in ferrallitischen Böden Kubas.