Title:	Physiological responses of watercress to brackish waters and different nutrient solution circulation times.
Authors:	SOUZA, C. A. de SILVA, A. O. da LACERDA, C. F. de SILVA, E. F. de F. e BEZERRA, M. A.
Affiliation:	CAMILA ALVES DE SOUZA, UNIVERSIDADE FEDERAL DO CEARÁ ALEXSANDRO OLIVEIRA DA SILVA, UNIVERSIDADE FEDERAL CEARÁ CLAUDIVAN FEITOSA DE LACERDA, UNIVERSIDADE FEDERAL CEARÁ ÊNIO FARIAS DE FRANÇA E SILVA, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO MARLOS ALVES BEZERRA, CNPAT.
Date Issued:	2020
Citation:	Semina. Ciências Agrárias, v. 41, n. 6, p. 2555-2570, nov./dez. 2020.
Description:	Water scarcity and the use of brackish water are the main challenges for agricultural development. In view of this, the present study proposes to examine physiological responses of the broadleaf-cress crop in an NFT hydroponics system according to the use of brackish water and nutrient solution circulation times. The treatments were distributed in a randomized block design with five water salinity levels (ECw: 0.6, 1.6, 2.6, 3.6 and 4.6 dS m-1) and two nutrient solution circulation times (T1 = 10 min and T2 = 15 min), totaling 10 treatments with four replicates, which resulted in 40 experimental plots. The following variables were analyzed: net photosynthetic rate, stomatal conductance, transpiration, leaf proline content, shoot moisture content, stem diameter and root length. The maximum observed photosynthetic rates were 20.9 mmol m-2 s-1 (T1) and 20.0 mmol m-2 s-1 (T2). Maximum stomatal conductance was 0.44 mol m-2 s-1, which decreased by 63.4% at the highest salinity level. The increasing ECw levels in both growing cycles evaluated reduced gas exchanges, stem diameter and root length. The nutrient solution circulation time of 15 min provided the most satisfactory results for the analyzed variables.
Thesagro:	Condutividade Eletrica Agrião
NAL Thesaurus:	Gas exchange Electrical conductivity Hydroponics
Keywords:	Nasturtium officinalis Trocas gasosas
ISSN:	1679-0359
DOI:	https://doi.org/10.5433/1679-0359.2020v41n6p2555
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPAT)