Effects of Pre-emergence in Combination with Post-emergence Herbicides on Weed Control, Growth and Yield of Maize
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Abstract
Background and Objectives: Appropriate use of herbicides on maize reduces the toxicity on maize and creates better growth environment for maize. The research aimed to test the weed control efficiency of pre-emergence herbicide combined with post-emergence herbicide on maize inbred lines and hybrid cultivars.
Methodology: The experiment was laid out in a split plot in randomized complete block design (RCBD) with 3 replications. The main plots were 7 treatments, the pre-emergence herbicides only are atrazine + pendimethalin and compared with pre-emergence herbicide combining with post-emergence herbicides including 6 treatments; included 2,4-D dimethylammonium, glufosinate ammonium, nicosulfuron + atrazine, topramezone + atrazine, tembotrione + atrazine, and mesotrione/atrazine. The subplots were 18 inbred lines of Kasetsart University, and hybrids (SW4452, NS3, S7328, PAC339, CP888, and DK6919) which were used as comparisons.
Main Results: The pre-emergence herbicides combined with post-emergence herbicides 2,4-D dimethylammonium resulted in curled leaves symptoms in the inbred Ki48, Ki60, and Ki61. The application of glufosinate ammonium caused severe plant injury while nicosulfuron + atrazine had an efficacy to control weed for 30 days after application of more than 80% (P < 0.05) but caused plant injury on and destroyed yield of Ki48, Ki50, Ki53, Ki56, Ki57, Ki58, Ki61, Ki63, and Ki64.
Conclusions: The application of topramezone + atrazine, tembotrione + atrazine, and mesotrione/atrazine showed high efficacy in controlling weed, and the yield was not significantly different (P < 0.05).
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