Abstract
ABSTRACT Weed interference is one of the factors that reduces carrot yield considerably. The aim of this study was to determine the periods of weed interference in carrots cultivated under two localized irrigation systems. The experiment used a completely randomized block design, with three replications, using the split plot scheme. The plots consisted of two irrigation systems (drip and micro sprinkler) and the subplots corresponded to the duration of coexistence of the crop with weeds, comprising periods of control (weed -free) or coexistence (with weeds) (0, 10, 20, 30, 40, 50, and 120 days after emergence (DAE) of the crop). Considering a yield loss of 2.5%, 5%, and 10% in marketable carrots, the beginning and end of the critical period of weed control (CPWC) was determined by adjusting a sigmoid model to the relative production data. The presence of the weed community throughout the crop cycle resulted in yield losses of up to 98%. The CPWP varied for the irrigation systems used. Carrot cultivation with and without competition, under the micro sprinkler irrigation system showed a higher yield than with the drip system. Considering a yield loss of 5%, the CPWC was 23 DAE and 7 DAE in the drip irrigation and micro sprinkler irrigation systems, respectively.
Highlights
The carrot (Daucus carota L.) is one of the most valuable vegetables in the tuberous root group.Worldwide carrot consumption is approximately 5.3 kg per person per year (FAOSTAT, 2017)
Vegetables are grown following the method of localized irrigation, using drip and micro sprinkler irrigation systems, which allows harvesting in the dry seasons
The number of weed species decreased over time in the carrot cultivation in the two irrigation systems (Figure 1)
Summary
The carrot (Daucus carota L.) is one of the most valuable vegetables in the tuberous root group.Worldwide carrot consumption is approximately 5.3 kg per person per year (FAOSTAT, 2017). In Brazil, carrots have great relevance for the olive sector, occupying the fifth position among the vegetable producers with greater participation in the country’s production (CARVALHO; SILVA 2017). Irrigation in carrot cultivation increases productivity and improves the quality of harvested roots; both deficit and excess water and improper management can affect root development (LIMA JUNIOR et al, 2014). The Mossoró region, Rio Grande do Norte, Brazil, is characterized by a semi-arid climate, where limited water resources are highly exploited. In this region, vegetables are grown following the method of localized irrigation, using drip and micro sprinkler irrigation systems, which allows harvesting in the dry seasons
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