SILVA, M. L. G.; http://lattes.cnpq.br/2727326156290749; SILVA, Maria de Lourdes Gomes da.
Résumé:
The increase in the salinity of irrigation water, caused by natural and anthropogenic
factors, is the main constraint to the development of agriculture in the northeastern
region of Brazil, making necessary studies that may contribute to the sustainable
exploitation of the region's agriculture. Among the alternatives is the use of tolerant
cultures, associated with attenuators, in order to reduce salinity damages. The
objective of this study was to evaluate the effect of nitrogen fertilization as an
attenuation of the salt stress of irrigation water in the production of tamarind
seedlings. The work was carried out in protected environment conditions
(greenhouse) at the Federal University of Campina Grande, Center of Science and
Technology Agrifood of the Campus of Pombal - PB. A randomized complete block
design was used in a 4 x 4 factorial scheme, whose factors were the levels of
electrical conductivity of the irrigation water - CEa (0.3, 2.1, 3.7 and 5, 2 dS m-1) and
nitrogen doses (0, 100, 200 and 300 mg of N dm-3). The growth of the seedlings is
reduced by the increase of the electric conductivity of the irrigation water, however,
irrigation with water of CEa 2.15 dS m-1, promotes acceptable reductions of 10% in
the morphology of the tamarind tree. The use of nitrogen fertilization with urea did not
attenuate the deleterious effeets of irrigation water salinity or promote better quality
seedlings of tamarind trees.