Abstract

SILVA, Paulo Vinicius da et al. Effect of sugarcane straw and precipitation on indaziflam efficacy. Rev. de Ciências Agrárias [online]. 2019, vol.42, n.4, pp.191-200. ISSN 0871-018X.  https://doi.org/10.19084/rca.17301.

The amount of straw on the soil after a harvest of sugarcane affects the weed emergency in the field and the behaviour of the pre-emergent herbicides. The objective of this work was to study the effectiveness of the indaziflam herbicide in the control of monocotyledon weeds, when to spread in different rates, amount of sugarcane straw and rainfall simulations. The experimental design was completely randomized, in a 4 x 2 factorial scheme, with four replications, being four straw amounts (0, 2, 5 and 10 t ha^-1) and two indaziflam doses (75 and 100 g ha ^-1). This factorial was isolated for rain (10, 30 and 40 mm) and weeds (Urochloa plantaginea, Digitaria nuda, Panicum maximum and Rottboelia exaltata). For all doses of herbicide, rainfall simulations and weed, the control was higher than 80% in 0 t ha^-1 of straw. For Urochloa plantaginea, Panicum maximum and Rottboellia exaltata, at the dose of 75 g ha^-1 of indaziflam, the control was lower in the larger amounts of straw. Digitaria nuda control was greater than 90% in all treatments. In conclusion, the amount of straw and rainfall can have a negative effect on weed control through indaziflam.

Keywords : herbicide; monocotyledons; straw removal; water blades.

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