Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Effect of spacing and of the use of cover legumes in the management of weed in Schizolobium amazonicum Huber ex. Ducke plantation.

Abstract

The increasing infestation of invading plants in cropping areas is one of the factors that affect most reforestation in Amazon, causing decreases in productivity due to direct competition for production factors. The objective of this study was to evaluate spacing effect (4×2 m, 4×4 m and 4×6 m) and the use of cover legumes (Cajanus cajan and Canavalia ensiformis) in the control of weed competition in Schizolobium amazonicum Huber ex. Ducke (Paricá) planting. The collections of invading plants were made 30 and 90 days after cover legumes sowing. Afterwards, they were taken to herbaria for identification. It was identified 24 species distributed in 13 botanical families. Regarding the infestation, diversity and richness of weeds, the best results were found in treatments with C. ensiformis. This legume influenced the floristic composition and structure of communities of invading plants. The use of 4 m × 2 m spacing contributed to less diversity and richness of those plants. The species of weeds most frequent in all treatments were Spermacoce capitata and Brachiaria brizantha.