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: II. Nitrogen and water use efficiencies, and salt tolerance. Trop. subtrop. agroecosyt [online]. 2011, vol.14, n.3, pp.757-763. ISSN 1870-0462.
The response to two nitrogen sources on water and nitrogen use efficiencies, and tolerance of salt-stressed chile pepper plants (Capsicum annuum L.) cv. Sandia was investigated in a greenhouse experiment. Low, moderate and high (1.5, 4.5, and 6.5 dS m-1) salinity levels, and two rates of organic-N fertilizer (120 and 200 kg ha-1) and 120 kg ha-1 of inorganic fertilizer as ammonium nitrate were arranged in randomized complete block designs replicated four times. The liquid organic-N source was an organic, extracted with water from grass clippings. Water use decreased about 19 and 30% in moderate and high salt-stressed plants. Water use efficiency decreased only in high salt-stressed plants. Nitrogen use efficiency decreased either by increased salinity or increased N rates. An apparent increase in salt tolerance was noted when plants were fertilized with organic-N source compared to that of inorganic-N source.
Palavras-chave : green pepper; soil salinity; organic fertilizer; nitrogen use efficiency; water use efficiency; salt tolerance.