Controle de plantas daninhas pelo indaziflam em solos com diferentes características físico-químicas

Herbicides in soil are subject to degradation and sorption processes that govern their fate and availability. The objective of this study was to evaluate the influence of three soils with contrasting physicochemical characteristics on a dose of indaziflam and the control efficiency of five weed species. The experiment was carried out in a greenhouse, in a randomized block design with four replications and a factorial 6 x 3 x 5. The treatments consisted of six doses of indaziflam (0; 30; 60; 90; 120 and 150 g a.i. ha-1), three soils (textural classes sand, clay, and sandy clay loam), and five weed species (Rottboellia cochinchinensis, Panicum maximum, Digitaria horizontalis, Euphorbia heterophyla, and Ipomoea grandifolia). The soil was sieved and placed on perforated trays, while the species were seeded at a depth of 0.015 m. The herbicide was applied to moist soils and trays placed under daily irrigation of approx. 5 mm. The emergence of weeds was assessed seven days after the emergence, and the control of weeds, 40 days after the treatment. The indaziflam was more effective in controlling the species D. horizontalis, P. maximum, and R. cochinchinensis. The first two were very sensitive to the herbicide, with full control of these species at all doses of the tested soils. In the clay soil, R. conchincinensis was effectively controlled from a dose of just 50 g a.i. ha-1. The control of E. heterophylla and I. grandifolia by indaziflam was more efficient in sandy clay loam soil.