Calcium as Salinity Mitigator on the Production Components of Passion Fruit Cultivated in Protected Pits1

‘Pitaya’ (Hylocereus undatus) is a fruit-bearing, climbing cactus with great food potential for the semiarid region. This study aimed to evaluate the production of ‘pitaya’ seedlings irrigated with low and high salinity water and grown in different light intensities. The experiment was conducted in a completely randomized design, in a 2 × 2 factorial arrangement, with two electrical conductivities of irrigation water: S1 - 0.3 dS m-1 (low salinity) and S2 - 5.0 dS m-1 (moderate salinity) in two environments: A1 - black net with 50% shading, and A2 - full sun, with ten replicates. The variables evaluated were plant height, main cladode diameter, above-ground biomass, root biomass, total plant biomass, number of secondary cladodes, root length, and length of secondary cladodes. The 50% shading (black net) promoted higher plant height, number of secondary shoots, and root length of the ‘pitaya’ plants. The irrigation with moderate saline water (5.0 dS m-1) reduced the number of secondary cladodes, length of root, and length of secondary cladodes. The ‘pitaya’ seedlings grown under 50% shading (black net) showed greater root dry biomass when irrigated with low-salinity water. Greater values of diameter of the primary cladode, above-ground dry biomass, and total dry biomass were observed under full sunlight and elevated saline stress.

“…Similar results to this study were reported by Bezerra et al (2020), who observed reductions in the productive branches of the yellow passion fruit irrigated with high salinity water.…”

Section: 0supporting

confidence: 92%

Effect of saline water and shading on dragon fruit (‘pitaya’) seedling growth

Sousa

Pereira

et al. 2021

“…The use of saline water has effects not only on the mineral nutrition of yellow passion fruit, but also on its physiological and productive aspects (Bezerra et al, 2019(Bezerra et al, , 2020. These authors observed reduction in the net photosynthetic rate and consequently in the yield of the crop irrigated with saline water, indicating the application of 60 kg ha -1 of calcium in Means followed by the same letter, at each calcium dose, do not differ by F test (p ≤ 0.05); * -Significant at p ≤ 0.05 by F test Entisol with low concentration of this nutrient as a mitigator of salt stress.…”

Section: Resultsmentioning

confidence: 99%

Calcium in the mineral nutrition of yellow passion fruit cultivated in lined pits and with saline water

Bezerra

Cavalcante

Bezerra

et al. 2021

Self Cite

Nutritional status is an important tool in salinity management, because salt stress interferes with both the absorption and the assimilation of mineral nutrients by plants. The objectives of this experiment were to evaluate the effects of water salinity, lateral protection of pits against water losses and calcium doses on the leaf concentration of macronutrients and sodium of yellow passion fruit cv. BRS GA1. The treatments were arranged in a randomized block design in split plots in a 2 × (2 × 5) factorial scheme, corresponding to water salinity (0.3 and 4.0 dS m-1) in the main plot, and the combinations between lateral protection of pits (without and with) and calcium doses (0, 30, 60, 90 and 120 kg ha-1) in the subplots. Leaf concentrations of macronutrients and sodium were determined at the phenological stage of full flowering. Irrigation of yellow passion fruit with 4.0 dS m-1 water decreased the leaf concentrations of macronutrients. The lining of the pits compromised macronutrient concentration in the plants. Calcium fertilization is recommended for yellow passion fruit cultivated in Entisol with low calcium concentration at the dose of 60 kg ha-1, because it raises nitrogen and calcium concentrations in plants irrigated with non-saline water and magnesium and sulfur concentrations in those irrigated with saline water. Calcium attenuates salt stress because it promotes the accumulation of macronutrients in yellow passion fruit under saline conditions.

“…Among the limiting factors to production in this region, the low rainfall, the high spatial-temporal variability of rainfall and the high concentration of soluble salts in irrigation water stand out. The excess of salts affects both the production of seedlings (Andrade et al, 2019;Bezerra et al, 2019;Souza et al, 2020) and plants of P. edulis in the field (Bezerra et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Growth of wild passion fruit (Passiflora foetida L.) rootstock under irrigation water salinity

Souza

Nascimento

Silva

et al. 2023

Wild passion fruit species, due to the greater tolerance to environmental stresses, reveal potential as interspecific rootstocks. Passiflora foetida is a wild species potentially tolerant to salinity. Therefore, the objective with the study was to evaluate the effects of irrigation water salinity on the growth of wild passion fruit (P. foetida L.) rootstocks. The experiment was carried out in a protected environment. The treatments consisted of the electrical conductivity of the irrigation water (0.3; 1.0; 2.0; 3.0 and 4.0 dS m-1), distributed in randomized blocks. The assessments were performed at 7, 14, 21, 28 and 35 days after transplanting and consisted of: stem height and diameter, number of leaves, average leaf size, leaf area, and dry matter of shoots, roots and total. In younger rootstocks, the deleterious effects of salinity on height growth and leaf components were observed under lower electrical conductivities, with tolerance increasing with age. However, dry biomass accumulation was more severely restricted by salinity with increasing rootstock age. P. foetida rootstocks are salinity tolerant and can be irrigated with water of up to 4.0 dS m-1.