Effect of different farming systems on weed species diversity
Kovac, K. | Zak, S. | Surovcik, J.(Vyskumny Ustav Rastlinnej Vyroby Piest'any, Slovensko)
In the years 1994-98 experiments were conducted with two farming systems in a stationary trial on fertile soil in maize production area, and their effect on weed species diversity was monitored. Evaluation of the effect of different farming systems for species diversity in plant stands after the first stage showed that in spring under the given soil and ecological conditions the weed species biodiversity per area unit was 5 percent higher in the ecological systems than in the integrated system. Weed species biodiversity decreased till the crop harvest constituted 49 percent of the starting number of weed species found in spring (100 percent), which was caused by herbicide application in IS. Reduction of weed species number by means of mechanical regulation and crop rotation system in the ecological systems was lower in comparison to the integrated system and represented 55 percent weed species in comparison with the amount of weeds in spring (100 percent). Before the harvest the weed species biodiversity in the ecological system was by 18 percent higher (10 species/square m) than in the integrated system (8.5 species/square m). Therefore chemical process will also have to be used to control weeds for a temporary period in ecological farming system again
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