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- Title
Physiological responses in sugar apple seedlings under irrigation with saline water and foliar nitrogen.
- Authors
de Fatima, Reynaldo Teodoro; Silva Nóbrega, Jackson; Andrade Ferreira, Jean Telvio; Freitas Celedônio, Wilma; Andrade Figueiredo, Francisco Romário; da Silva Ribeiro, João Everthon; Benigna Pereira, Micaela; Esfrain Pereira, Walter
- Abstract
Irrigation water salinity is one of the most limiting factors to agriculture in the Northeast region of Brazil, compromising photosynthesis in most crops, especially in the early growth phase, thus requiring the development of research to mitigate its harmful effects. In this context, this study aimed to evaluate the effects of nitrogen fertilization for the mitigation of the salinity on the physiology of sugar apple seedlings. The experimental design was in randomized blocks, using five levels of electrical conductivity of irrigation water (0.5; 1.15; 2.75; 4.35 and 5.0 dS m-1) and five nitrogen levels via foliar application (0.0; 0.33; 1.15; 1.97 and 2.3 g L-1) in four replications and two plants per plot, totaling nine combinations generated by the Box Central Composite Design. Despite stimulating chlorophyll formation 70 DAS, saline water inhibits the fluorescence of chlorophyll a in photosystem II. Foliar nitrogen fertilization at the level of 1.62 g L-1 mitigates the effects of salinity on the gas exchange properties of sugar apple seedlings. The fluorescence activity and chlorophyll indices show positive responses to foliar nitrogen fertilization in sugar apple seedlings 70 DAS.
- Subjects
BRAZIL; SALINE irrigation; IRRIGATION water; CHLOROPHYLL spectra; SALINE waters; ELECTRIC conductivity; NITROGEN in water; FOLIAR feeding
- Publication
Brazilian Journal of Agricultural Sciences / Revista Brasileira de Ciências Agrárias, 2022, Vol 17, Issue 2, p1
- ISSN
1981-1160
- Publication type
Article
- DOI
10.5039/agraria.v17i2a473