Water relations in parsley plants cultivated in brackish nutrient solutions of different cationic natures/Relacoes hidricas em plantas de salsa cultivada em solucoes nutritivas salobras de naturezas cationicas distintas

• Published in: Revista brasileira de engenharia agrícola e ambiental 2019-09, Vol.23 (9), p.662
• Main Authors: Ma, Santos, Jose A., Jr, Bartusch, Victor P, Gheyi, Hans R, Neto, Egidio Bezerra, da Silva, Manasses M
• Format: Article
• Language: Spanish
• Subjects: Electric properties; Electrical conductivity; Physiological aspects; Salinity; Water
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v23n9p662-668

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[degrees] 1' 7" S and 34[degrees] 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. Grauda Portuguesa, cultivated in brackish nutrient solutions (electrical conductivities of 1.7, 2.7, 3.7, 4.7, 5.7 and 6.7 dS [m.sup.-1]) prepared in waters with different cationic natures (NaCl, Ca[Cl.sub.2], KCl and Mg[Cl.sub.2]). 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.sup.-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 Ca[Cl.sub.2] water with electrical conductivity above 5.7 dS [m.sup.-1], in the replacement with brackish water. Key words: Petroselinum crispum, soilless cultivation, water content A analise da resposta das plantas a variabilidade cationica das aguas, somado ao componente osmotico, e imprescindivel no contexto do estresse salino. Neste sentido, entre outubro de 2017 e fevereiro de 2018, em Recife, PE (8[degrees] 1' 7" S e 34[degrees] 56" 53" O, e altitude de 6,5 m), o presente trabalho foi desenvolvido com o objetivo de avaliar as relacoes hidricas em plantas de salsa (Petrocelinum crispum), cv. Grauda Portuguesa, cultivadas em solucoes nutritivas salobras (condutividades eletricas de 1,7; 2,7; 3,7; 4,7; 5,7; 6,7 dS [m.sup.-1]) preparadas em aguas com naturezas cationicas diferentes (NaCl, Ca[Cl.sub.2], KCl e Mg[Cl.sub.2]). O delineamento experimental adotado foi o inteiramente casualizado, em esquema fatorial 6 x 4, com cinco repeticoes, cada uma consistindo de cinco plantas. Dois experimentos foram realizados sequencialmente sob esta configuracao estatistica; no primeiro, a reposicao da lamina evapotranspirada foi efetuada com agua de