The grains of Cicer arietinum (chick-peas) is one of the richest sources of proteins among worldwide grain crops. However, 100% of chick-peas grains consumed in Brazil are imported. Aiming to contribute with agricultural technologies to yield this crop in Brazil, we studied the interference of sourgrass thresholds at the initial development of chick-peas in tropical conditions. We evaluated the competition effects of seven sourgrass densities on chick-peas crops from 15 to 45 days after sowing. These effects were evaluated according to interferences on chick-peas height, number of leaves and offshoots, stem diameter, leaf area and dry mass. We observed low interferences with up to 8 sourgrass plants m-2 and several interferences from 16 to 128 plants m-2 justifying the control of sourgrass at the initial development of chick-peas.
Key words: Cicer arietinum, Digitaria insularis, competition, interference, weed.
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