Trocas Gasosas do Feijao-Caupi Cultivado no Nordeste Paraense em Resposta à Deficiência Hídrica Forçada Durante a Fase Reprodutiva

Souza, Paulo de Oliveira Ponte de Jorge; Ferreira, D. P.; Sousa, Denis de Pinho; Nunes, Hildo Giuseppe Garcia Caldas; Barbosa, Antônio Vinícius Corrêa

doi:10.1590/0102-7786351029

Cited by 3 publications

(1 citation statement)

References 24 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Brazil, cowpea is predominantly grown under rainfed conditions by family farmers in the North and Northeast regions (SOUZA et al, 2020). However, its cultivation is expanding to the Central-West and Southeast regions of Brazil as an option for winter crops after summer soybean, maize, and rice crops, reaching yields higher than 1,000 kg ha -1 (ALMEIDA et al, 2017;FREIRE FILHO et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Weed interference periods in cowpea crop

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Weed interference periods in cowpea crop

et al. 2023

View full text Add to dashboard Cite

show abstract

Economic indicators for cowpea cultivation under different irrigation depths

Teixeira

Costa

Luz

et al. 2023

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

Cowpeas are of high socioeconomic importance in the North and Northeast regions of Brazil, whereby the search for alternatives that offer increased productivity with financial returns has become an important challenge. Thus, the objective of this study was to estimate and evaluate the economic indicators of cowpea production in 2015 and 2016 when applying drip irrigation to different depths. Irrigation treatments were based on crop evapotranspiration (ETc). The experiment was laid in a randomized complete blocks design with four treatments (0, 25, 50, and 100% ETc) and six replications. For economic analysis, the results were extrapolated to an area of one hectare. Productivity in 2015 was lower than that in 2016; however, in all treatments, it was always higher when plants were grown under adequate water supply. In both years, the total operating costs were higher under irrigation than under rainfed conditions. The 100% ETc treatment resulted in a greater number of cowpea bags (60 kg) produced and a higher gross revenue than the rainfed treatment by 17 bags ha-1, equivalent to 1,020 kg ha-1 (gross revenue US$ 711.48) and 16 bags ha-1, equivalent to 960 kg ha-1 (gross revenue US$ 867.12), in 2015 and 2016, respectively. Water deficit limited cowpea yield in both years but made cultivation economically unfeasible only in 2015.

show abstract

Cowpea Ecophysiological Responses to Accumulated Water Deficiency during the Reproductive Phase in Northeastern Pará, Brazil

et al. 2021

Self Cite

View full text Add to dashboard Cite

Cowpea (Vigna unguiculata (L.) Walp.) is a leguminous species widely cultivated in northern and northeastern Brazil. In the state of Pará, this crop still has low productivity due to several factors, such as low soil fertility and climatic adversity, especially the water deficiency. Therefore, the present study aimed at evaluating the physiological parameters and the productivity of cowpea plants under different water depths. The experiment was conducted in Castanhal/Pará between 2015 and 2016. A randomized block design was applied with six replications and four treatments, represented by the replacement of 100%, 50%, 25% and 0% of the water lost during crop evapotranspiration (ETc), starting from the reproductive stage. The rates of net photosynthesis (A), stomatal conductance (gs), leaf transpiration (Eleaf), substomatal CO2 concentration (Ci), leaf temperature (Tleaf) and leaf water potential (Ψw) were determined in four measurements at the R5, R7, R8 and R9 phenological stages. Cowpea was sensitive to the water availability in the soil, showing a significant difference between treatments for physiological variables and productivity. Upon reaching a Ψw equal to −0.88 MPa, the studied variables showed important changes, which allows establishing this value as a threshold for the crop regarding water stress under such experimental conditions. The different water levels in the soil directly influenced productivity for both years, indicating that the proper water supply leads to better crop growth and development, increasing productivity.

show abstract

Trocas Gasosas do Feijao-Caupi Cultivado no Nordeste Paraense em Resposta à Deficiência Hídrica Forçada Durante a Fase Reprodutiva

Cited by 3 publications

References 24 publications

Weed interference periods in cowpea crop

Weed interference periods in cowpea crop

Economic indicators for cowpea cultivation under different irrigation depths

Cowpea Ecophysiological Responses to Accumulated Water Deficiency during the Reproductive Phase in Northeastern Pará, Brazil

Contact Info

Product

Resources

About