Produtividade E Eficiência Do Uso De Água Da Bananeira Caipira Sob Diferentes Densidades De Plantio E Lâminas De Irrigação

Abstract

RESUMOO aumento da eficiência de uso de água (EUA) pode ser conseguido pela redução da transpiração das plantas, como pelo aumento da produtividade para a mesma quantidade de água evapotranspirada pela cultura. O objetivo do trabalho foi avaliar a resposta da bananeira cultivar Caipira a quatro níveis de água sob duas densidades de plantio no primeiro ciclo. As variáveis analisadas foram altura da planta, circunferência do pseudocaule a 0,30 m do solo, área foliar a partir do comprimento, largura da terceira folha e número de folhas. Durante a colheita foram avaliados: rendimento, peso de pencas, comprimento, diâmetro médio, peso de fruto (dedo central da segunda penca), e a EUA. O delineamento experimental foi em blocos casualizados com quatro repetições, seguindo um esquema em parcelas subdivididas com a densidade de plantas (um e dois seguidores por touceira) na parcela e o nível de água aplicado na subparcela (lâmina com base na ETc e 85%, 70% e 50% da ETc). A redução na aplicação de água de irrigação em até 30% da quantidade recomendada não trouxe reduções significativas na produtividade da bananeira cultivar Caipira. A condução de dois seguidores por touceira não diferiu da condução do bananal com um seguidor, em termos de crescimento e produtividade. PALAVRAS-CHAVE: Evapotranspiração, manejo de irrigação, microaspersão YIELD AND WATER USE EFFICIENCY OF BANANA CV CAIPIRA UNDER DIFFERENT PLANT DENSITY IRRIGATION WATER DEFICITSABSTRACT The increase in water use efficiency (WUE) may be accomplished by plant transpiration reduction as well by the increase in yield for the same amount of evapotranspiration water by crop. The objective of the work was to evaluate the response of banana cv Caipira to four levels of water under two planting densities during the first cycle.. The experiment design followed a random block design with four replications, in a split plot scheme. The plant density (one and two plants per bunch) in the plot and the level of water in the subplot (water depth based upon:ETc

Socio-Economic Indexes for Water Use in Irrigation in a Representative Basin of the Tropical Semiarid Region

“…These values are higher than those observed in other studies with banana crop irrigated by furrows infiltration [48]. However, in a semiarid region of the Minas Gerais state, it was found PWP of up to 4.6 kg m −3 for irrigation management based on ET c fractions, and reduction in the water depth up to 42% of ET c did not lead to significant reductions in yield [39]. For cultivar "nanicão" in the semiarid region of Paraíba, it was found yields ranging from 20,569 kg ha −1 to 31,940 kg ha −1 , as a function of irrigation depth, and water productivities between 2.5 kg m −3 and 4.1 kg m −3 , respectively [49].…”

“…PWP was equal to 0.479 kg m −3 , which is comparable to the average value of 0.43 kg m −3 verified with continuous flooding and application of a gross volume of 13,760 m 3 ha −1 in silty-clayey-textured soils in the Morada Nova irrigated perimeter, LJ sub-basin [38]. The increase in PWP can be achieved both by reducing the volume of water applied and by increasing the yield for the same amount of water [39]. Figure 2A shows the relationship between PWP and RIS for some crops selected in LJ.…”

Rentabilidade de cenoura orgânica influenciada por manejos de solo e tipos de semeadura

“…The economic indicators were also positive for carrot cultivation with organic fertilization, with a profitability index of 49.40% (Oliveira et al, 2012). For organic chive production in another study, the profitability index was 267% (Souza et al, 2015), attesting to the economic viability of organic olericulture.…”

Profitability of organic carrot cultivation under weed interference and sowing methods

“…In this scenario, evaluating economic indicators and production costs is essential to determine the viability of agricultural crops. Therefore, assessing whether investments are compatible with the obtained revenues, or whether producers can continue developing the activity, becomes an essential pre-requirement for organic farming (Souza et al 2015). Furthermore, the production economic evaluation may help to estimate costs and is decisive to reduce risks and assist in developing and diversifying agricultural activities (Oliveira et al 2022).…”