Revista Brasileira De Herbicidas 2001; 2(3): 143-148
Efficacy of herbicides in postemergence control of weeds in corn crop
DOI: 10.7824/rbh.v2i3.363
The objective of this research was to evaluate the agronomic efficiency of herbicides applied as a postemergence treatment on the control of weeds and to evaluate the tolerance of the treatments for com. The experiment was developed during the period from december/OO to april/O 1, at FEP-UNESP at Selvíria, Mato Grosso do Sul, Brasil. The experiment was carried out in a conventional system and the hybrid com used was ‘Master ‘ at a spacing of 0.9 m between rows with 5.4 seeds per meter. The experimental design was a randomized complete block, with 9 treatments and 4 replicates with 5 !ines of the crop. Plot size was 4.5 x 5.0 m. The treatments were: foramsulfuron (35.0 and 45.5 g/ha), foramsulfuronliodosulfuronmethyl- sodium (36.0/2.4 and 45.0/3.0 g/ha), nicosulfuron (50.0 g/ha), foramsulfuron- atrazine (35.0+1000.0 and 45.0+1000.0 g/ha) and a weed-free and a weeded control. The applications were accomplished with a manual sprayer and constant pressure (COz) of 45 lb/pol-, equipped with four Teejet 110.03 XR nozzles, spaced at 0.5 m and volume of 250 I/ha. The treatments were selective for the crop. The treatments foramsulfuron (45.5 g/ha), foramsulfuronliodosulfuron-methyl-sodium (36.0/2.4 and 45.0/3.0 g/ha) and foramsulfuroru-atrazine (45.0+1000.0 g/ha) were efficient in the control of Bidens pilosa, Commelina benghalensis and Digitaria horizontalis. The treatments foramsulfuron (35.0 g/ha), nicosulfuron (50.0 g/ ha) and forarnsulfuron+atrazine (35.0+ 1000.0 g/ha) were efficient in the control of B. pilosa and C. benghalensis.
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