Gas exchange in yellow passion fruit under irrigation water salinity and nitrogen fertilization

Abstract

The objective of this study was to evaluate the gas exchange of ‘Redondo Amarelo’ passion fruit seedlings under the mitigating action of nitrogen fertilization on the salinity of irrigation water. The experiment was carried out in a greenhouse of the Universidade Federal de Campina Grande (CCTA-UFCG), Campus of Pombal, PB, Brazil, The experimental design was in randomized blocks, split plots, comprising five irrigation water electrical conductivities (plot) (ECw) (0.3; 1.0; 1.7; 2.4 and 3.1 dS m-1) and five doses of nitrogen (subplot) (60; 80; 100; 120 and 140% of 300 mg of N dm-3), in five blocks. Plants were grown in pots (Citropote JKS®) with volume of 3.780 mL, filled with soil, bovine manure, wood shavings in a proportion of 2:1:0.5 (mass basis), respectively. Water with salinity levels was applied in the period from 40 to 85 days after sowing. The internal CO2 concentration, transpiration, stomatal conductance and photosynthesis were measured at 55 and 70 days after sowing. There was an attenuating effect of nitrogen doses at irrigation water electrical conductivities of 1.7 and 2.4 dS m-1 on photosynthesis at 55 DAS. Irrigation water salinity reduces most of the variables evaluated, especially at the highest level studied (3.1 dS m-1).

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

“…In addition, the reduction in leaf turgor, as observed in this study (Figures 1A and 9A), induces stomatal closure, as a defense mechanism of the plant against the loss of water by transpiration, affecting physiological processes, such as stomatal conductance, internal CO 2 concentration and CO 2 assimilation rate [48]. Reductions in gas exchange in sour passion fruit plants caused by irrigation with saline water have also been reported in other studies, such as [5,13,16,30].…”

“…Climate change that has occurred all over the world has increased atmospheric temperatures and caused droughts [ 2 , 3 ]. Thus, the climatic imbalance between evaporation and precipitation rates promotes the increase in salt concentrations in sources of water used for irrigation [ 4 , 5 ].…”

Aplicação de quitosana no cultivo do algodoeiro de fibra colorida ‘BRS Jade’ sob restrição hídrica

“…The semi-arid region of Northeast Brazil faces notable challenges due to its intrinsic water limitations . This situation is aggravated by significant temporal and spatial variability in rainfall, high rates of evapotranspiration, and consequently complex water management demands (Lacerda et al, 2022;Wanderley et al, 2022). Given these climatic traits, irrigation is often essential to ensure reliable Semina: Ciênc.…”