Influência da profundidade da semente e da textura do solo na emergência do azevém

Abstract

Ryegrass (Lolium multiflorum) is an annual or biannual plant, which has a wide geographical distribution. It is used as a forage intended for ruminants due to its high nutritional value, but because it has high regrowth capacity and resew naturally can be a problem, becoming a weed. The above study aimed to evaluate the behaviour of seedling emergence of reyegrass seedlings from sowing on different substrates and depths. The experiment was conducted in the laboratory, using seeds collected in the field, in a BOD-type germination chamber with a fixed temperature of 20 °C, with alternathing photoperiod of day and night. There was a difference in the results of the emergence of ryegrass, both when analysed in relation to depth and in relation to the type of substrate. The highest emergency values occurred on the surface, and with the use of substrate with a more sandy than clayey texture. There was no emergency at a depth of 8 cm in any test performed. As a result, it is possible to identify that the problems of reseeding ryegrass as a weed can be aggravated by lower depths in the distribution of seeds in the soil profile and in situations where the soil has higher sand contents than clay. While the first condition can be modified with the use of techniques, such as soil upturning to bury seeds at depths greater than 6 cm, the second is an edaphic characteristic that cannot be changed.