Abstract
Nicosulfuron is an herbicide used in corn crop for controlling weeds, some hybrids are sensitivity to nicosulfuron even more when it is applied near to the application of nitrogen fertilizers. Thus, this study aimed to evaluate the response of sensitive corn hybrids to association of urea and coated urea applied near to nicosulfuron application on V4 corn stage. P 3646 hybrid was the most sensitive, and urea and coated urea applied near to nicosulfuron had significant effect on corn growth for all hybrids. Most hybrids showed high or significant (p < 0.10) correlation coefficients for grain yield, cob length and row per ear. SYN 7341 hybrid was the one that showed better results in grain yield with urea and nicosulfuron combination. Coated urea should not be applied after V8corn stage when nicosulfuron is applied at V4.
Highlights
The average second-season corn grain yield in Midwestern Brazil is 6098 kg ha-1 and the state of Goiás is the second most productive, with average of 6342 kg ha-1 (Conab, 2017)
Among the herbicide options to be used in corn crops, glyphosate became the most used worldwide and as consequence, there are 10 dicots and 13 monocots resistant weeds, and corn is the second crop, with 58 resistant biotypes (Heap, 2014)
The reliance of herbicides is due to weed interference period, which might alter plant growth and mainly final grain yield (Faria et al.,2014; Knezivic and Datta,2015)
Summary
The average second-season corn grain yield in Midwestern Brazil is 6098 kg ha-1 and the state of Goiás is the second most productive, with average of 6342 kg ha-1 (Conab, 2017). Farmers challenge to reach higher yields due to resistant weeds, water deficit, pests and diseases (Giachini et al, 2017). Researchers and agronomists became an important source of information, because they aim to develop the best management practices to farmers who search for higher yields. The reliance of herbicides is due to weed interference period, which might alter plant growth and mainly final grain yield (Faria et al.,2014; Knezivic and Datta,2015). A review study on weed interference showed that weed can reduce corn grain yield in USA and Canada by 52% (Soltani et al, 2016). A field study on weed interference in southeastern Brazil showed reduction in corn grain yield of 54% (Campos et al, 2016)
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