Tsveta HRISTEVA, Mariyan YANEN, Shteliyana KALINOVA, Hristo BOZUKOV

Comparative Analysis of Some Herbicides from Amide and Dinitroaniline Families on the Soil Microorganisms

Anahtar Kelimeler:

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Comparative Analysis of Some Herbicides from Amide and Dinitroaniline Families on the Soil Microorganisms

The changes under the influence of some herbicides from dinitroaniline family (Wing P – a.s. dimethenamid-P + pendimethalin and Benefin – a.s. benfluralin) and amide familiy (Butizan S – a.s. metazachlore and Dual Gold 960 EC – a.s. S-metolachlor) in the basic trophic groups of soil microorganisms, on population level, were traced. Herbicides were applied when cultivation of oriental tobacco on humus-calcareous (rendzina) soil. Microbiological analyzes were carried out in dynamics, during the period - before treatment, to the 15th-day, 35th-day, 50th-day and 90th-day after their submission in the soil. The numerical development of assimilating mineral nitrogen microorganisms were suppressed from the four herbicides was found. An action of amides herbicide was highly. The negative impact on ammonifying microorganisms was relatively weak. Treatment with Wing P reported even some stimulation. The effect of herbicides from the amide family of density of actinomycetes was excitatory and inhibitory of dinitroaniline family. The negative effect was durable and very strong at Benefin. Indicative of deteriorating living conditions in the soil were generally increased population density of the spore microorganisms and proportion of spores. The power of influence (ηх2) of the factor herbicides was about 40% and was statistically significant. The comparative analysis of microbial communities in the presence of various herbicides shows disorders percentage distribution of the different groups of microorganisms. Stronger when they are dinitroaniline herbicides. The likely period of adaptation of microbial communities after treatment was about 15 days for Butizan S (a.s. metazachlore), 35 days for Dual Gold 960 EC (a.s. S-metolachlor) and 50 days for dinitroaniline herbicides. Dynamics over time suggests the possibility for participants in the early stages of biodegradation of amide herbicides were actinomycetes, and of dinitroaniline - assimilating mineral nitrogen microorganisms

Keywords:

Amide, dinitroaniline, herbicides soil microorganisms,

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