Abstract
Nicosulfuron is the commonly used herbicide for the control of annual weeds and broadleaf weed species in maize production. However, little is known about the length of time nicosulfuron can remain in the spray tank prior to application in the field without impacting efficacy. The objective of this study was to evaluate the effect of different storage times of the nicosulfuron spray solution on phytotoxicity, production and physiology of Marandu palisadegrass [Urochloa brizantha (Hochst. ex A. Rich.) R. D. Webster cv. Marandu]. The experiment was analyzed in a 6 × 5 factorial arrangement with a complete randomized design. The treatments were six storage times of the nicosulfuron spray solution (0, 6, 12, 24, 48 and 72 h) applied in the Marandu palisadegrass, and five evaluation periods (0, 7, 14, 21 and 60 days after application). Phytotoxicity by the nicosulfuron in the Marandu palisadegrass had parabolic pattern as a function of the interaction between storage time and evaluation period. The photosynthetic rate decreased as a function of the days after nicosulfuron application and showed a discrete increase as a function of the spray solution storage time. Nicosulfuron solution acidifies with time and the effects on phytotoxicity decreased by 30% after 72 h.
Highlights
Worldwide, maintaining the productivity and profitability of crops on a commercial scale is very dependent on the use of pesticides (Sharma et al, 2018)
The objective of this study was to evaluate the effect of different storage times of the nicosulfuron spray solution on phytotoxicity, production and physiology of Marandu palisadegrass [Urochloa brizantha
As observed for phytotoxicity, the plants are affected by the herbicide, these results indicate a 46% reduction in the nicosulfuron efficacy after 72 h of storage
Summary
Worldwide, maintaining the productivity and profitability of crops on a commercial scale is very dependent on the use of pesticides (Sharma et al, 2018). Whether in terrestrial or aerial spraying, success in phytosanitary treatment depends on products quality, and on the technology developed for their application. Several problems in the field can delay the application of the herbicides decreasing its effectiveness, because some herbicides cannot remain in spray solutions for extended periods of time (Eure et al, 2013). Information in the peer-reviewed literature is not evident relative to the impact of the length of time that nicosulfuron can remain in the spray tank prior to application (Stewart et al, 2009; Eure et al, 2013). In this work were evaluated the effects of different storage times of the nicosulfuron spray solution on the physiology and production of palisadegrass {Urochloa brizantha
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