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- Title
CRECIMIENTO DEL GIRASOL (Helianthus annuus L.) EN FUNCIÓN DE LA SALINIDAD DEL AGUA DE RIEGO CON FERTILIZACIÓN NITROGENADA.
- Authors
dos-Santos, João Batista; Marenco-Centeno, Cruz Ramón; de-Azevedo, Carlos Alberto Vieira; Raj-Gheyi, Hans; de-Lima, Geovani Soares; de-Lira, Vanda Maria
- Abstract
Water is a resource for agriculture, urban and industrial activities. It is insufficient in the arid climate areas in the north east of Brazil. Saline water is as an alternative to the expansion of agricultural irrigation areas. Our objective was to assess the effect of irrigation with saline water and nitrogen fertilization on sunflower (Helianthus annuus L.) cv. EMBRAPA 122-V2000 growth. This study was carried out in a greenhouse at the Campina Grande Federal University, Paraiba, Brazil, between April and July 2012. The experimental design was completely random with three replications in a 5×5 factorial arrangement; salinity levels in irrigation water, with electrical conductivity (ECa) of 0.7, 1.7, 2.7, 3.7 and 4.7 dS m-1 (25 °C) and N doses of 50, 75, 100, 125 and 150 mg kg-1 as factors, in 75 experimental units. The variables evaluated during the growth cycle were: plant height, stem diameter, number of leaves, leaf area, flowering onset, maximum inflorescence opening, inner and external flower diameter, and chlorophyll content. The results with ECa of 0.7 dS m-1 linearly decreased. The salinity of the irrigation water and nitrogen fertilization interaction was not significant in the evaluated variables, except for the plant height 15 d after sowing. The flowering variables were delayed as the salinity of the irrigation water increased and chlorophyll content decreased, but increased with N.
- Publication
Agrociencia, 2017, Vol 51, Issue 6, p649
- ISSN
1405-3195
- Publication type
Article