Water relations in parsley plants cultivated in brackish nutrient solutions of different cationic natures

Abstract

The analysis of plant response to the cationic variability of the waters, in addition to the osmotic component, is indispensable in the context of salt stress. Thus, between October 2017 and February 2018, in Recife, PE, Brazil (8° 1’ 7” S and 34° 56’ 53” W, and altitude of 6.5 m), the present study was carried out to evaluate the water relations of parsley plants (Petroselinum crispum), cv. Graúda Portuguesa, cultivated in brackish nutrient solutions (electrical conductivities of 1.7, 2.7, 3.7, 4.7, 5.7 and 6.7 dS m-1) prepared in waters with different cationic natures (NaCl, CaCl2, KCl and MgCl2). The experimental design was completely randomized, in a 6 x 4 factorial scheme, with five repetitions, and five plants per plot. Two experiments were conducted sequentially under this statistical design; in the first, the evapotranspired depth was replaced with supply water (0.12 dS m-1) and in the second, with the respective brackish water. The increment in nutrient solution salinity influences the fresh and dry biomass and the percentages of total, shoot and root dry masses, and this increment led to different behavior in parsley physiology under the different cationic natures of the water, being less harmful with the use of supply water to replace the evapotranspired depth and with CaCl2 water with electrical conductivity above 5.7 dS m-1, in the replacement with brackish water.

Physiological aspects and production of coriander using nutrient solutions prepared in different brackish waters

“…Gains in the production of fresh and dry biomass in coriander plants with the increase in the concentration of salts were also verified by Martins et al (2019), who also found that the prevalence of Na + , Ca 2+ , and Mg 2+ impacts differently (p ≤ 0.05) the SFM of parsley with increasing concentration.…”

“…Analysis of chlorophyll fluorescence, CO 2 internal concentration, instantaneous carboxylation efficiency, and CO 2 assimilation rate helps to understand the limitations imposed by salinity on gas exchange (Shoukat et al, 2019) and on the photosynthetic process (Martins et al, 2019).…”

Ionic relationships between macronutrients and sodium in parsley under nutrient solutions prepared with brackish water

“…In parsley plants exposed to different cationic natures there are changes in production (Martins et al, 2019b), water relationships (Martins et al, 2019a), and photochemical efficiency (Martins et al, 2020). However, studies that address aspects of use efficiency and relationships between nutrients are still scarce.…”

Water yield and consumption of cauliflower plants grown in a hydroponic system using brackish waters and different flow rates

“…Some regions usually undergo water shortages, such as the Semiarid region of the Northeast of Brazil, where agricultural crops are often grown using irrigation with underground brackish waters (Albuquerque et al, 2015). The need of using technologies compatible to this situation is evident in these regions (Paulus et al, 2012;Silva Júnior et al, 2019).…”

“…However, despite NFT hydroponics is used for crops that are relatively tolerant to salt stress, such as cauliflower (Giuffrida et al, 2016), it presents specificities regarding the use of brackish waters that still require studies. These specificities include the frequency and flow rate of the circulation of the nutrient solution (Silva Júnior et al, 2019;Soares et al, 2020), and the chemical composition of the waters used for the crops (Martins et al, 2019).…”