Occurrence of weed species due to the implementation of a crop succession system and early fertilization
Palavras-chave:
phytosociology, corn silage, pearl milletResumo
The combination of management practices affects weed populations and biodiversity. The objective was to evaluate the infesting weed community in the implementation of a corn silage (Zea mays L.) /pearl millet (Pennisetum glaucum L)/corn silage succession system subjected to early potassium fertilization in the winter crop. The experiment began in October 2019 under fallow area. In the 2019/20 summer season, corn silage was grown in a complete area. In the 2020 fall/winter season, the plots consisted of pearl millet, six doses of potassium fertilization (0, 30, 60, 90, 120 and 150 kg ha-1) and one fallow. In the 2020/21 summer season, the treatments consisted of corn silage and six doses of K2O, complementing the treatment applied in the previous harvest (120, 90, 60, 30, 0 kg ha-1) and one with recommended fertilization. Phytosociological evaluations of weeds were performed using a 0.25 m2 square. The density and number of species increased in the first year. Early fertilization at doses of 90, 120 and 150 kg ha-1 of K2O increased the dry weight of weeds before planting and at V4 stage of the corn silage cultivated in sequence; however, were lower than those for plots fallowed in the winter.
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