Tropical and subtropical agroecosystems
versão On-line ISSN 1870-0462
HUEZ-LOPEZ, Marco A. et al. Response of chile pepper (Capsicum annuum L.) to salt stress and organic and inorganic nitrogen sources: III. Ion uptake and translocation. Trop. subtrop. agroecosyt [online]. 2011, vol.14, n.3, pp.765-776. ISSN 1870-0462.
The combined effect of salinity and two N sources on content, uptake rate and translocation of nutrients by chile pepper plants (Capsicum annuum L.) cv. Sandia was investigated in a greenhouse experiment. Either an organic-N liquid fertilizer extracted from grass clippings or ammonium nitrate, an inorganic fertilizer, were combined with three different soil salinity treatments (1.5, 4.5, and 6.5 dS m-1). Fertilizer treatments were two rates of organic-N fertilizer (120 and 200 kg ha-1) and 120 kg ha-1 of inorganic fertilizer. The combination of each N rate and source with the three salinity levels were arranged in a randomized complete block design replicated four times. The use of the organic-N source produced greater cation contents (Ca2+, Mg2+, Na+ and K+) in roots, shoots, and enhanced the uptake rates and translocation of cations to shoots compared to plants fertilized with inorganic -N. The root and shoot concentration, uptake rates and root-to-shoot transport of Cl- increased at increasing salinity. Higher contents of Cl- and cations in chile pepper shoots in relation to roots were observed. It was also observed that high N rate from the organic source enhanced the cation contents in both roots and shoots. Salinity diminished N content, N uptake rate and root to shoot transport in both roots and shoots.
Palavras-chave : green pepper; salinity; organic fertilizer; ion uptake rate; root-to-shoot ion transport.