Padrão de emergência de plântulas de Sporobolus indicus (capim-capeta) em diferentes profundidades no solo

Abstract

Wiregrass (Sporobolus indicus) is an invasive plant in pastures that has gained great relevance today. The study on the behavior of seedling emergence is of fundamental importance for the adoption of management strategies for this weed. Because of this, the objective of this research was to evaluate the emergence pattern of Wiregrass seedlings as a function of sowing depth. The experiment was carried out in a greenhouse in a completely randomized design, with eight replications, with eleven depths (0.0; 1.0; 2.0; 3.0; 4.0; 5.0; 6.0; 7.0; 8.0; 9.0; 10.0 cm). The effect of sowing depth was evaluated by the number of emerged seedlings, the emergence speed index, relative emergence frequency, mean emergence time and seedling emergence synchrony obtained over 27 days after sowing. Sowing depth influences seedling emergence. Consequently, as deeper as the seeds are in the substrate as smaller as is the seedling emergence. Wiregrass has better emergence vigor on the soil surface. The seeds arranged at depths 1.0, 2.0, 3.0 and 4.0, despite emerging, had a lower emergence capacity in relation to the surface. No seedling emergence was observed at depths equal or above to 5.0 cm.