Lolium multiflorum seed quality analyzed by accredited laboratories in the Rio Grande do Sul State

Abstract

The objective of this research was to carry out a survey, through the levels of physical purity, percentage of pure seeds, number of other seeds, and the physiological quality through germination, in the samples of ryegrass seeds analyzed in laboratories accredited by the Ministry of Agriculture, Livestock and Supply in Rio Grande do Sul. Data from 3959 ryegrass samples analyzed from the period 2014 to 2017 were compiled. Quality of the seeds was presented through the percentage of samples within the standards recommended for commercialization, for the variables germination, pure seeds, seeds of cultivated species, wild, noxious, tolerated and noxiously forbidden, in all factors, cultivar, region of origin, category and crop of seed production. Quality of the lots of ryegrass seeds, analyzed by the laboratories of Rio Grande do Sul, obtained in the harvest of 2013 the lowest percentage of lots approved for commercialization, 57.96%, and the harvest of 2014, 2015 and 2016 with 89.60% 91.39% and 91.34%, respectively. In regions where livestock predominates, the percentage of ryegrass seed lots approved for commercialization was lower.

Sowing rate and its effects on forage yield of tetraploid ryegrass

“…The sowing rate, as well as the number of plants per square meter, is one of the factors that most affect the plant morphogenesis, described as the dynamics of generation and expansion of the shape of the plant in space (Lemaire & Chapman, 1996). Seed quality is a key factor in achieving the desired plant density (Huth et al, 2020). The rate of leaf elongation and the appearance of leaves are among the morphogenic variables determining the main structural characteristics of pastures, such as leaf size, tiller production and forage yield (Pontes et al, 2003).…”