Weed Interference in Carrot Yield in Two Localized Irrigation Systems

Reginaldo, Laís Tereza Rêgo Torquato; Lins, Hamurábi Anízio; Sousa, Matheus de Freitas; Teófilo, Taliane Maria da Silva; Mendonça, Vander; Silva, Daniel Valadão

doi:10.1590/1983-21252021v34n113rc

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…The decreases in number of weeds and the higher shoot dry matter accumulation of weeds at the end of the cowpea cycle can be attributed to the occupation of space by the dominant weed species, suppressing the less competitive ones. Intra and interspecific competitions increase as the plants grow, decreasing the availability of resources, remaining only plants with higher initial growth rates and dominant, taller, and well-developed plants, in detriment of smaller and less developed plants (REGINALDO et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

Weed interference periods in cowpea crop

et al. 2023

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Cowpea is one of the pulse crops that present the highest potential for growing in the Semiarid region of Brazil. Lowcost vegetable protein source, it has resilience to adverse conditions, however, in competition with weeds, its productivity can be strongly compromised. To overcoming this situation, it is essential for integrated management programs to determine the critical period for preventing interference. Thus, the objective of this work was to determine weed interference periods and the effect of coexistence periods on cowpea grain yield in the Semiarid region of the state of Minas Gerais, Brazil. The treatments were arranged in a 2×9 factorial scheme, as follows: cultivation in coexistence with weeds and cultivation under weed control, for nine crescent periods (0-7, 0-14, 0-21, 0-28, 0-35, 0-42, 0-49, 0-56 and 0-63 days after crop emergence), in a randomized experimental block design with four replications. The weed community was studied through phytosociological survey and evaluation of dry matter production and cowpea was evaluated for dry matter production, 100-grain mass and grain yield. The interference periods were determined using a non-linear logistic regression model. The weed community found was composed of 70% dicotyledonous and 30% monocotyledon plants, distributed in seven families and ten species. The coexistence with weeds results in losses of up to 90% in cowpea grain yield. The critical period of weed control in cowpea crop in the Semiarid region of the state of Minas Gerais, Brazil, is 11 to 36 days after crop emergence.

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Section: Resultsmentioning

confidence: 99%

Weed interference periods in cowpea crop

et al. 2023

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“…In horticultural crops, weed control is one of the most difficult and costly tasks [8] . It is indicated that the competitive capacity of the carrot plant is low because emergence and early growth are relatively slow [9] .…”

Section: Introductionmentioning

confidence: 99%

Phytosociological study of weeds associated with carrot crops in two municipalities of Boyacá

Córdoba-Patiño

Pinzón-Sandoval

2022

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With the purpose of knowing the phytosocilogy of weeds associated to a carrot crop (Daucus carota L.) under conditions of the municipalities of Ventaquemada and Jenesano-Boyacá, one lot per municipality destined to carrot cultivation was selected and a W-shaped layout was made covering an area of 500 m2. Relative density, relative frequency, relative dominance and the importance value index (IVI) were calculated, as well as the Alpha and Beta diversity indices for the sampled areas. A total of 6 families and 11 species were counted, of which 63.64% were represented by annual plants and 36.36% by perennial plants. The class Liliopsida (Monocotyledon) was represented by the Poaceae family. The Magnoliopsida class (Dicotyledon) was represented by the following families: Asteraceae, Brassicaceae, Boraginaceae, Leguminosaceae, Polygonaceae, the last one being the one with the highest number of species. The species R. crispus and P. nepalense were the ones with the highest values of Importance Value Index (IVI) with 0.953 and 0.959, respectively. According to the Shannon-Wiener diversity and Simpson’s dominance indices, the evaluated areas presented a low species diversity and a high probability of dominant species. The results obtained can serve as a basis and tool for carrot growers in the evaluated areas to define management plans for the associated weeds and thus optimize yields in this crop.

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Economic Evaluation and Effectiveness of Herbicides Applied in Pre-Emergency in the Sesame1

et al. 2021

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The sesame crop has great economic potential due to the various possibilities of exploitation, however, there is a lack of information about the chemical control of weeds in the crop, mainly about the application of herbicides in pre-emergence. Therefore, the objective of this study was to evaluate the economic viability and efficacy of herbicides applied in pre-emergence for the control of weeds in the sesame crop. The experimental design was in randomized blocks, with four replications. The treatments consisted of seven herbicides (diuron, flumioxazin, oxadiazon, oxyfluorfen, metribuzin, linuron, and S-metolachlor) and a mixture (metribuzin + oxyfluorfen) applied in pre-emergence. The two control treatments were weeded and nonweeded plots. The variables evaluated were percentage of control of the weed community, grain yield, gross and net income, rate of return, and profitability index. The highest productivity value was for weeding, followed by the herbicides diuron and flumioxazin, with 2,000.44 kg ha-1, 1,957.35 kg ha-1;, and 1,933.13 kg ha-1, respectively. The herbicides diuron and flumioxazin obtained the highest net income, in the amounts of R$ 7,831.26 and R$ 7,762.85, respectively. The diuron and flumioxazin applied in pre-emergence showed more than 80% in the control of weeds in the sesame crop, showing efficiency in the control. The use of herbicides applied in pre-emergence to control weeds, mainly diuron and flumioxazin, is as efficient as mechanical control, demonstrating the potential for use and economic viability in relation to mechanical control, which presents a high cost/benefit ratio.

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Weed Interference in Carrot Yield in Two Localized Irrigation Systems

Cited by 8 publications

References 28 publications

Weed interference periods in cowpea crop

Weed interference periods in cowpea crop

Phytosociological study of weeds associated with carrot crops in two municipalities of Boyacá

Economic Evaluation and Effectiveness of Herbicides Applied in Pre-Emergency in the Sesame1

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