Selectivity of Linuron Herbicide for Carrot When Sprayed in Post-Emergence

Abstract

-Among the herbicides registered for carrot crop in Brazil, linuron is the most used one, according to horticulturists. However, there are few reports in the literature on its selectivity for the carrot plants. Therefore, the aim of this work is to study the selectivity of linuron herbicide for growing carrots, influenced by genotype, product dosing, and plant development phase at the time of application. This work included four experiments, one in greenhouse, and three in the field, in area of commercial carrot production. In the greenhouse, the experimental design was completely randomized in factorial scheme 4 x 2 x 3, with four replications. Linuron, at doses 0, 225, 450 and 675 g a.i. hawas sprayed in plants with 1 and 2-3 true leaves of cultivars Brasilia, Kuronan and Verano. In the field, two experiments were carried out, one with the cultivar Verano and the other with BRS Planalto. In three experiments, the experimental design was a randomized block in factorial 2 x 5, with four replications. Verano or BRS Planalto plants were sprayed, in two stages of development (1 and 3 true leaves for Verano, and 1 and 2 true leaves for BRS Planalto), with 0, 225, 450, 675 and 990 g a.i. ha RESUMO -Entre os herbicidas registrados para a cultura da cenoura no

Impact of some Agronomical Practices on Carrot Productivity and Nutritional Value تأثير بعض الممارسات الزراعية على إنتاجية الجزر و القيمة الغذائية

“…Similarly, Lana (2012) found differences in the root weight between cultivars. Also, Correia and Carvalho (2017) found significant differences in root length among Brazilian carrot cultivars.…”

“…The presence of weeds is considered to be one of the biotic factors responsible for reducing both quantity and quality of the roots. Decreased root production is possible up to 100% due to lack of proper control (Freitas et al, 2009, Swanton et al, 2010, Correia and Carvalho, 2017. Weeds can serve as hosts for pests, diseases and nematodes, thus weed control is one of the focal cost constrains affecting carrot production (Boydston et al, 2008).…”

“…Linuron has been the utmost commonly used carrot herbicide for carrot crop for several years (Swanton et al 2010;Correia and Carvalho, 2017). -1-methoxy -1-methylurea) is a synthetic urea herbicide used to combat annual and perennial broadleaf and grassy weeds at crop and non-crop sites.…”

“…It is used as a pre-and post-emergent herbicide and works by inhibiting photosynthesis in target weed plants, causing them to lose color, wilt, then die. Post-emergency sprayed linuron was recommended by Correia and Carvalho (2017) for growing carrots, regardless of cultivar, product dosage and plant development. Crop yields treated with herbicides reflected their weed control efficiencies (Pacanoski et al, 2014).…”

Yield and nutritional value of two carrot cultivars in response to Linuron pre and post-emergence and three planting systems

“…Roots of Chantenay had significantly larger root (in both seasons) and core diameter (in 2019) than those of Nantes, but there were no noticeable differences between the two cultivars in root length in both seasons and core diameter (in the first season). However, Correia and Carvalho (2017) found significant differences in root length among Brazilian carrot cultivars. The roots of the Verano hybrid are longer than the roots of the Brasilia and Kuronan cultivars.…”