The objective of this study is to verify the interference of Bidens pilosa, Cyperus rotundus and Digitaria horizontalis, under five densities (0, 10, 20, 30 and 40 plants per vase), of nitrogen, phosphorus, potassium, calcium and magnesium contents present in the D leaf, and in its length, at 30, 60 and 90 days after pineapple crop planting. In general, the nutrient contents in the D leaf of pineapple decreased with increasing weed density, but the most extracted elements at 30 days were phosphorus and potassium, respectively; besides, C. rotundus and D. horizontalis were the species that most interfered in the nutritional content of the pineapple crop. In relation to D leaf length, an analogous behavior was verified, i.e., weed density increased as D leaf length value decreased.
Bidens pilosa; Cyperus rotundus; density; Digitaria horizontalis
