Potassium fertilization in the cultivation of sour passion fruit under irrigation strategies with brackish water

Abstract

In the Brazilian semiarid region, the occurrence of water sources with high salt concentrations stands out as a limiting factor for the production of most crops under irrigated conditions. This research was conducted to evaluate the physical and chemical quality of sour passion fruit as a function of brackish water irrigation strategies and potassium doses. The experiment was carried out under field conditions using a randomized block design in a 6 × 2 factorial scheme, consisting of six strategies of irrigation with brackish water (irrigation with water of 1.3 dS m-1 throughout the cycle - WS; irrigation with water of 4.0 dS m-1 in the vegetative stage - VE; flowering stage - FL; fruiting stage - FR; in the successive vegetative/flowering stages - VE/FL; vegetative/fruiting stages - VE/FR) and two potassium doses: 60 and 100% (345 g of K2O per plant per year) of recommendation, with four replicates and three plants per plot. Irrigation with water of 4.0 dS m-1 in the flowering stage or continuously in the vegetative and flowering stages reduced the yield and size of sour passion fruit. Fertilization with 60% of K is recommended for the production of sour passion fruits with greater polar diameter. It is feasible to cultivate sour passion fruit under irrigation with 4.0 dS m-1 of water in the flowering and fruiting stages and fertilization with 60% of the K recommendation without losses in ascorbic acid and total soluble sugars.

Produção E Qualidade Pós-Colheita Do Maracujazeiro-Azedo Irrigado Com Águas Salinas E Aplicação Exógena De H2o2

“…Vale destacar que as plantas também possuem a capacidade de se aclimatar, até certo ponto as condições de estresse por meio de processos fisiológicos comuns em plantas glicófitas, como o efeito do ajustamento osmótico. Pinheiro et al (2023) avaliando a adubação potássica (60 e 100% da recomendação de K2O) e diferentes estratégias de manejo no uso de águas salinas (1,3 e 4,0 dS m -1 ), também observaram redução nos parâmetros morfológicos dos frutos de maracujazeiroazedo quando as plantas foram irrigadas com água de 4,0 dS m -1 durante todo o ciclo de cultivo, na fase vegetativa assim como também na fase de floração. O aumento na condutividade elétrica da água de irrigação reduziu o diâmetro equatorial (DE) dos frutos de maracujazeiroazedo 'BRS Rubi do Cerrado' independente da aplicação foliar do peróxido de hidrogênio.…”

Foliar Applications of Salicylic Acid on Boosting Salt Stress Tolerance in Sour Passion Fruit in Two Cropping Cycles

“…The excess of salts in irrigation water also induces the inhibition of physiological and metabolic processes, negatively affecting the production components [68]. Reductions in the production components of sour passion fruits as a function of irrigation water salinity have also been reported in studies conducted by [13,15,39].…”

“…Two studies have indicated that the sensitivity and tolerance of crops to salt stress may vary between species and cultivars of the same species, in addition to depending on climatic conditions, type of soil, plant development stage, irrigation method, and time of exposure to salt stress [ 16 , 39 ]. In the present study, it was observed that the deleterious effects of salinity were intensified in the second cycle, possibly due to a longer period of exposure to salt stress and the accumulation of salts in the soil.…”

Salicylic Acid as a Salt Stress Mitigator on Chlorophyll Fluorescence, Photosynthetic Pigments, and Growth of Precocious-Dwarf Cashew in the Post-Grafting Phase

“…However, despite the potential of cashew production in the Northeast region, the irregularity and poor distribution of rainfall in the region, associated with high temperatures, results in high evapotranspiration rates, complicating the cultivation of this crop [5]. In this scenario, the employment of irrigation emerges as a viable solution for continuous cultivation, allowing the expansion of productive regions over the year [6].…”