Phytosociological Survey of Weed Plants in Intercrops of Common Beans and Castor Beans

Santos, Fenelon Lourenço Sousa; Teixeira, Itamar Rosa; Timossi, Paulo César; Silvério, João Gustavo Dias; Benett, Cleiton Gredson Sabin

doi:10.1590/s0100-83582017350100033

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…According to Lacerda et al (2021), the higher occurrence of dicotyledon weed species found may be connected to their class, which is the same of cowpea, presenting similarities that make them more difficult to control. In addition, species that have C4 photosynthetic metabolism, as those from the families Poaceae, Portulacaceae, and Amaranthaceae (Table 1), may have some competitive advantages when they occur in crops with C3 photosynthetic metabolism plants (SANTOS et al, 2017), such as cowpea. This information raises the attention for the choice of effective control measures for these species in integrated weed management programs.…”

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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“…Due to the need for greater knowledge about the selectivity of herbicides in order to improve the management of weeds in castor crop [26,29], new studies that identify safer combination strategies used in pre-or postemergence can be configured as new alternatives to expand options and provide a greater spectrum of control of weed species [8,15,16]. These combinations can involve the herbicide tank mixture in a single application or even associations in split applications throughout the crop cycle, used before or after the emergence of castor and weeds.…”

Section: Introductionmentioning

confidence: 99%

Selectivity of Pre and Postemergence Herbicides in Single or Combined Applications in Castor Crop

et al. 2020

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One of the main challenges in castor crop (Ricinus communis L.) production is efficient weed management mainly due to limited options of selective herbicides. This study evaluated the selectivity of herbicides applied alone or in combination in pre- and postemergence applications in castor crop. Two field experiments were carried out under irrigation conditions in a semi-arid region of Northeast Brazil. It was found that the visual symptoms of phytointoxication of the herbicides used on castor were mild in both experiments. Consequently, there were no significant interferences on plant height, number of racemes, and grain (seed) yield. Pre-emergence applications (g ha−1) of trifluralin (1800), pendimethalin (1500), clomazone (750), clomazone + trifluralin (750 + 1800), and clomazone + pendimethalin (750 + 1500) followed by chlorimuron-ethyl in postemergence (15 g ha−1) are selective to castor. The application (g ha−1) of pendimethalin + clomazone (1000 + 500) in pre-emergence, associated with chlorimuron-ethyl (10 and 15), metamitron (2800 and 4200), ethoxysulfuron (60 and 80), or halosulfuron-methyl (75 and 112.5) in one or two applications in postemergence, as single or split applications, in an interval of 14 days, are selective to castor crop.

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“…In general, these families have been well-represented in studies investigating weeds in various crops (Oliveira and Freitas, 2008;Santos et al, 2017).…”

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confidence: 99%

“…Its resistance may also be due to the low efficiency of the mechanical methods used for its control, and to its rapid reproduction, which may be vegetative or by seeds (Concenço et al, 2013;Santos et al, 2001). There have been reports in the literature of the species in the states of Bahia (Silva et al, 2006), Rio Grande do Norte (Moura , Minas Gerais (Sarmento et al, 2015), Goiás (Santos et al, 2017), Rio de Janeiro (Oliveira and Freitas, 2008), and Paraná (Costa et al, 2014), among others. Therefore, it is commonly reported in studies carried out in different regions of Brazil.…”

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Weed Vegetation Structure in an Area of Organic Acerola Cultivation, Parnaíba, Piauí, Brazil

et al. 2020

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This study aimed to identify and quantify the weed species in an area of organic acerola cultivation in the Distrito de Irrigação dos Tabuleiros Litorâneos do Piauí (DITALPI) in Parnaíba, Piauí, Brazil. Phytosociological sampling was completed in the rainy season, before the farmers adopted management techniques for the plants. Thirty plots of 0.25 m2 were sampled. The plots were located between crop rows, which consisted of herbaceous-subshrub plants. The absolute and relative covers and the absolute and relative frequencies of each species were calculated based on the occurrence and cover of each species. In total, 25 species comprising 13 families were registered, among which the Poaceae family that presented the largest number of species. Commelina benghalensis occurred the most frequently overall. Shannon’s diversity index (H’) and evenness were calculated as 2.30 nats ind-1 and 0.69, respectively. Five species accounted for 79.33% of absolute cover at DITALPI. The species were distributed heterogeneously within the field, and Commelina benghalensis, Urochloa plantaginea, Panicum maximum, Amaranthus spinosus, Cynodonsp., and Cyperus aggregatus were the species most likely to infest the acerola crop. As DITALPI is an area of organic cultivation, understanding these species is essential to help farmers select the best form of control.

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Phytosociological Survey of Weed Plants in Intercrops of Common Beans and Castor Beans

Cited by 5 publications

References 9 publications

Weed interference periods in cowpea crop

Weed interference periods in cowpea crop

Selectivity of Pre and Postemergence Herbicides in Single or Combined Applications in Castor Crop

Weed Vegetation Structure in an Area of Organic Acerola Cultivation, Parnaíba, Piauí, Brazil

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