Adubação nitrogenada como atenuante do estresse salino da água na produção de mudas de tamarindeiro.

Abstract

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.