Sowing depth and light intensity in the emergence and development of monocotyledonous weeds

This study aimed to evaluate the effects of different sowing depths and light intensities on emergence development monocot weed species, Urochloa decumbens Cenchrus echinatus, under field conditions. Each species constituted an experiment, experimental design was completely randomized with four replicates. The treatments were arranged in a 6 x 4 factorial scheme, six (0.5, 1.0, 2.0, 4.0, 8.0, 12.0 cm) associated solar radiation (100%, 70%, 50%, 30%) obtained through use shading screens. Seedling capacity evaluated daily obtain percentage speed index. Plant height, floral induction time, plant dry matter at flowering measured. Even when subjected intensities, U. C. echinatus seedlings emerged all depths. Sowing between 2.0- 4.0-cm favored echinatus. However, 12-cm depth reduced both regardless intensity. Urichloa plants grown conditions greater showed lowest values height accumulation during flowering. High levels facilitated only etiolation plants. Increased time compared full sunlight.