Resumo

BARRERA FONTANET, Marta et al. Weed population in soils treated with different management techniques of in sugar cane. Ctro. Agr. [online]. 2019, vol.46, n.3, pp. 76-85. ISSN 0253-5785.

In order to evaluate the percentage of weed cover in different cultivation techniques, a study was made of the population of weeds, in the production unit "Manuel Sánchez" of the Sugar Company "Argeo Martinez", Guantánamo, between April and July 2014, in the 1st shoot strain, variety C90-647, on a soil alluvial, compacted, from 24 days after the mechanized harvest. The percentage of coverage, wealth, dominance and species diversity were evaluated in five management techniques and three replications, as well as the economic valuation. The results showed that the coverage percentage varied indistinctly by treatment and remained below 1. 4% from 30 days until the study stage was concluded. The Margalef index was higher for the Deep Cultivation treatment 1.10 + 1.60 m, while the similarity index for all the combinations at 90 days after assembly showed imbalance of species between treatments with values ​​lower than 0.5. The diversity of weeds showed that a total of 11 weed species inhabited the area with a predominance of the Poaceae; relative abundance was observed in five species with superiority of Cynodon dactylon revealing a gradual decrease in the Deep Cultivation treatment 1.10 + 1.60 m during the period. The lowest and highest cost for clean days, was for the treatments Unaltered coverage of crop residues and deep cultivation 1.10 + 1.60 m respectively.

Palavras-chave : diversity; dominance; frequency of appearance; wealth.

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