Padrão de emergência de plântulas de capim-capeta (Sporobolus indicus) influenciada pela quantidade de palha de capim-braquiarão em cobertura

Abstract

Wiregrass (Sporobolus Indicus (L.) R. Br) is an invasive plant in pastures that has gained great relevance nowadays. Because of this, the objective of this research was to evaluate the emergence pattern of Wiregrass seedlings as a function of the amount of Urochloa brizantha grass straw in coverage. The experiment was carried out in a greenhouse condition in a completely randomized design, with eight replications and the treatments consisted of eight amounts of straw, as following: (0.0; 0.5; 1.0; 2.0; 4.0; 6.0; 8.0 and 10.0 t ha-1 ). The effect of the amount of straw was evaluated by the number of emerged seedlings, relative emergence frequency, mean emergence time, emergence synchrony and the seedling emergence speed index obtained over 30 days after sowing. The highest number of emerged seedlings, uniformity and seedling emergence speed were obtained in the condition in which the seeds were covered with 0.0 and 0.5 t ha-1 of straw. The lowest number of emerged seedlings was obtained in the condition of 8.0 and 10.0 t ha-1 of straw deposited on the seed.