Manejo químico de Urochloa ruziziensis consorciado com soja na savana de Roraima
DOI:
https://doi.org/10.7824/rbh.v17i2.581Keywords:
Cover crops, production components, desiccation, forageAbstract
The objective of the study was to evaluate the chemical management of Urochloa ruziziensis intercropped with soybean under no tillage system in the Roraima savanna. The experiment was conducted in an experimental area located in the municipality of Boa Vista - RR, in the year 2015. The treatments consisted of the combination of four doses of the herbicide glyphosate (720; 1.200; 1.680 and 2.160 g ha-1 of i.a) sprayed prior to sowing the soybean as a desiccant and five doses of the herbicide fenoxaprop-p-ethyl (0; 38.5; 77; 115.5 and 154 g ha-1 of i.a) sprayed 32 days after emergence of the post-emergence crop. The experimental design was a randomized complete block in the subdivided plots scheme, with four replications. For the soybean crop were evaluated the height of plants, height of insertion of the first pod, number of pods per plant, number of grains per pod, mass of 100 grains and grain yield in kg ha-1. The fresh and dry forage mass was evaluated for U. ruziziensis at 70 days after soybean harvest and expressed in kg ha-1. It was concluded that only the application of glyphosate at a dose of 1387,64 g ha-1, applied in post-emergence in the soybean crop, guarantees maximum grain yield (3660,07 kg ha-1) and of fresh mass (10136,22 kg ha-1) and dry matter (2404,63 kg ha-1) of U. ruziziensis for soil cover for the next planting, necessary to guarantee the sustainability of the productive system.Downloads
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Published
2018-06-10
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Section
Weed Management







