Abstract:In the Brazilian semi-arid region, water deficit is one of the main factors that compromise the growth and productive yield of crops, including yellow passion fruit, due to the limitation of carbon assimilation by the photosynthetic activity of plants. Therefore, it is necessary to manage the soil with technologies that can reduce the loss of water in the soil and mitigate the effects of water deficit on yellow passion fruit plants cultivated under semi-arid conditions. The objective of this study was to evalu… Show more
“…Hydro-absorbent polymers can absorb and retain a large amount of water and fluids, reducing nutrient losses by leaching, such as nitrogen, which is a constituent element of chlorophyll molecules (Felippe et al, 2016(Felippe et al, , 2020 and is present in fertilizers such as urea and organic matter. Comparable results were obtained by Araújo et al (2022) in yellow passion fruit cv. BRS GA1 irrigated in soil with mulching and hydrogel polymer; these authors found that applying 1.5 g dm -3 of the polymer increased leaf chlorophyll indices.…”
Section: Chlorophyl Indicessupporting
confidence: 60%
“…The larger planting hole volume has high interaction with increased irrigation depth due to the greater water supply provided by the irrigation depth in a larger volume of soil explored by the roots of yellow passion fruit plants, as roots are concentrated within the topmost soil layer up to 40 cm deep (Sousa et al, 2005;Lucas et al, 2012;Rosa et al, 2017). Araújo et al (2022) also found that the application of hydro-absorbent polymer doses associated with mulching increased leaf transpiration in yellow passion fruit plants irrigated with maximum water depth.…”
Section: Gas Exchangementioning
confidence: 85%
“…However, this result shows that combining increased irrigation depths with hydrogel polymer provides a larger wetted area near the root of yellow passion fruit plants, hence promoting favorable conditions for plant development and avoiding water stress (Testezlaf, 2017;Felippe et al, 2021). Under water deficit conditions, hydrogel polymer increases water retention in the soil, promoting a gradual release and availability of water to plants, and preventing stomatal limitation (Araújo et al, 2022).…”
Section: Gas Exchangementioning
confidence: 99%
“…In the Northeast, the primary production areas are located in semi-arid regions, which, despite ideal soil and climatic conditions for yellow passion fruit cultivation, face temporal and spatial limitations in rainfall and low availability of water in terms of quantity and quality in reservoirs, necessitating supplemental irrigation (Freire et al, 2014;Araújo et al, 2022). According to Uchoa et al (2021), inadequate water supply to yellow passion fruit is one of the most limiting factors for production and, in general, plants under water deficit conditions reduce their physiological processes, limiting gas exchange and carbon assimilation, thereby resulting in reduced yields (Cavalcante et al, 2020).…”
Passion fruit cultivation relies on irrigation to increase yields in the semiarid of northeastern Brazil. Water scarcity is one of the factors that most affect crop physiology, leading to lower yields. Therefore, this study aimed to assess the influence of planting hole volume and application of a hydroretentive polymer on physiological and productive aspects of irrigated yellow passion fruit cv. BRS GA1 in the Northeast semi-arid region of Brazil. The experiment was conducted in randomized blocks, in a split-plot design 2 × (2 × 2). Treatments consisted of irrigation depths (100% and 70% of the crop's evapotranspiration requirement - ETc), planting hole volumes (64 dm3 and 128 dm3), and soil with and without application of hydroretentive Polymer (1.5 g dm3), with four replicates and three plants per plot. The analyzed variables included chlorophyll a and b indices, gas exchange, and yellow passion fruit yield. The findings showed that hydroretentive polymer application to the soil increases chlorophyll content and gas exchange in yellow passion fruit. Moreover, photosynthetic rates were not limited by a 30% reduction in irrigation depth and increased in plants grown in 128-dm3 planting holes with hydroretentive polymer. Based on yield results, irrigation depths can be reduced to 70% of the ETc by applying hydroretentive polymer in 64-dm3 planting holes.
“…Hydro-absorbent polymers can absorb and retain a large amount of water and fluids, reducing nutrient losses by leaching, such as nitrogen, which is a constituent element of chlorophyll molecules (Felippe et al, 2016(Felippe et al, , 2020 and is present in fertilizers such as urea and organic matter. Comparable results were obtained by Araújo et al (2022) in yellow passion fruit cv. BRS GA1 irrigated in soil with mulching and hydrogel polymer; these authors found that applying 1.5 g dm -3 of the polymer increased leaf chlorophyll indices.…”
Section: Chlorophyl Indicessupporting
confidence: 60%
“…The larger planting hole volume has high interaction with increased irrigation depth due to the greater water supply provided by the irrigation depth in a larger volume of soil explored by the roots of yellow passion fruit plants, as roots are concentrated within the topmost soil layer up to 40 cm deep (Sousa et al, 2005;Lucas et al, 2012;Rosa et al, 2017). Araújo et al (2022) also found that the application of hydro-absorbent polymer doses associated with mulching increased leaf transpiration in yellow passion fruit plants irrigated with maximum water depth.…”
Section: Gas Exchangementioning
confidence: 85%
“…However, this result shows that combining increased irrigation depths with hydrogel polymer provides a larger wetted area near the root of yellow passion fruit plants, hence promoting favorable conditions for plant development and avoiding water stress (Testezlaf, 2017;Felippe et al, 2021). Under water deficit conditions, hydrogel polymer increases water retention in the soil, promoting a gradual release and availability of water to plants, and preventing stomatal limitation (Araújo et al, 2022).…”
Section: Gas Exchangementioning
confidence: 99%
“…In the Northeast, the primary production areas are located in semi-arid regions, which, despite ideal soil and climatic conditions for yellow passion fruit cultivation, face temporal and spatial limitations in rainfall and low availability of water in terms of quantity and quality in reservoirs, necessitating supplemental irrigation (Freire et al, 2014;Araújo et al, 2022). According to Uchoa et al (2021), inadequate water supply to yellow passion fruit is one of the most limiting factors for production and, in general, plants under water deficit conditions reduce their physiological processes, limiting gas exchange and carbon assimilation, thereby resulting in reduced yields (Cavalcante et al, 2020).…”
Passion fruit cultivation relies on irrigation to increase yields in the semiarid of northeastern Brazil. Water scarcity is one of the factors that most affect crop physiology, leading to lower yields. Therefore, this study aimed to assess the influence of planting hole volume and application of a hydroretentive polymer on physiological and productive aspects of irrigated yellow passion fruit cv. BRS GA1 in the Northeast semi-arid region of Brazil. The experiment was conducted in randomized blocks, in a split-plot design 2 × (2 × 2). Treatments consisted of irrigation depths (100% and 70% of the crop's evapotranspiration requirement - ETc), planting hole volumes (64 dm3 and 128 dm3), and soil with and without application of hydroretentive Polymer (1.5 g dm3), with four replicates and three plants per plot. The analyzed variables included chlorophyll a and b indices, gas exchange, and yellow passion fruit yield. The findings showed that hydroretentive polymer application to the soil increases chlorophyll content and gas exchange in yellow passion fruit. Moreover, photosynthetic rates were not limited by a 30% reduction in irrigation depth and increased in plants grown in 128-dm3 planting holes with hydroretentive polymer. Based on yield results, irrigation depths can be reduced to 70% of the ETc by applying hydroretentive polymer in 64-dm3 planting holes.
“…Passiculture has great socioeconomic importance for the semiarid region of the Brazilian Northeast; however, water in this region is the most limiting factor for obtaining high yields, due to high evaporative rates and irregular distribution of rainfall, making it necessary to use irrigation [ 4 , 5 ]. However, the use of water by agricultural crops is considered very low, as approximately 60% of the applied water, depending on the irrigation method, is lost by evaporation [ 6 ].…”
Water availability is a limiting factor for the cultivation of sour passion fruit. Soil management techniques and the use of water-retaining polymers can increase soil water retention, reducing the frequency of irrigation in the crop. In this context, the objective of the research was to evaluate the gas exchange, the chlorophyll index, and the yield of the sour passion fruit cv. BRS GA1 as a function of irrigation depths, pit volumes, and doses of water-retaining polymer. The experiment was carried out in randomized blocks, in plots subdivided in a 2 × (2 × 5) arrangement, with irrigation depths of 70 and 100% of the crop evapotranspiration (ETc) as the main plot, the subplots with the volumes of pit of 64 and 128 dm3, and doses of the water-retaining polymer of 0, 0.5, 1.0, 1.5, and 2.0 g dm−3. The interaction of irrigation depths × pit volumes × doses of water-retaining polymer influences chlorophyll indexes, gas exchange, and water productivity, with positive impacts on yield of the sour passion fruit. The water depth of 70% of ETc increased the yield of sour passion fruit, in pits of 64 dm3. The application of doses of up to 1.1 g dm−3 of the water-retaining polymer and irrigation with water of 70% of ETc is recommended, and a dose of 2.0 g dm−3 of the water-retaining polymer in a pit volume of 128 dm3, associated with an irrigation depth of 100% ETc causes stress in sour passion fruit plants due to excess water.
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