Open AccessMorphophysiological responses of table beet irrigated with saline water under application of humic substances
Author(s) -
Leandra de Melo Cavalcante Sousa,
Thiago Jardelino Dias,
Roberto Pequeno de Sousa,
Mário Leno Martins Véras,
Ygor Henrique Leal,
Anderson Carlos de Melo Gonçalves,
Ewerton Gonçalves de Abrantes,
Adriano Silvano Lopes,
Marcos Fabrício Ribeiro de Lucena,
Lucas Soares Rodrigues
Publication year - 2021
Publication title -
australian journal of crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 44
eISSN - 1835-2693
pISSN - 1835-2707
DOI - 10.21475/ajcs.21.15.07.p2498
Subject(s) - stomatal conductance , saline water , salinity , transpiration , soil salinity , irrigation , chemistry , agronomy , soil water , humic acid , chlorophyll , photosynthesis , horticulture , environmental science , biology , soil science , fertilizer , ecology , biochemistry
The use of saline water is an alternative for irrigating agricultural crops, especially in the Brazilian Northeastern semi-arid region, where water quality is limited in most cases. Thus, the objective was to evaluate the morphophysiological responses of table beet cv. “Wonder” irrigated with saline waters under the application of humic substances. The experiment was conducted under a randomized block design, with six replications in a 6 x 4 x 5 factorial scheme, referring to six electrical conductivities of irrigation water (ECw): 0.5; 1.5; 2.5; 3.5; 4.5 and 5.5 dS m-¹, four humic substances rates (HS) (0; 10; 20 and 30 ml per plant), and five stages of assessment (23, 38, 53, 68 and 83 days after emergency). The characteristics evaluated were: plant height, number of leaves, leaf area, chlorophyll content (a, b and total), stomatal conductance, transpiration, net photosynthesis and CO2 internal concentration, and in the soil, the soil pH and the electrical conductivity of saturated paste extract. The increase of salinity reduced growth, chlorophyll a content, and the stomatal conductance of beet plants. The application rate of 30 ml per plant of humic substances promotes an increase in stomatal conductance. The application of humic substances raises the pH in sandy acidic soils. It is recommended to irrigate table beet plants with water of 0.5 dS m-1 associated with the application of 30 mL per plant of humic substances