Crescimento de mudas de aceroleira irrigadas com águas salinizadas e adubação nitrogenada.

Abstract

Agricultural exploitation in the semi-arid region of northeastern Brazil is dependent on the use of irrigation to ensure the production of crops; However, parts of the waters used are salinized and require the development of technologies that enable their use in agriculture. Thus, the objective of this work was to evaluate the effect of different saline levels of irrigation water associated with increasing doses of nitrogen fertilization on the growth of "CMI102" saplings. The experiment was carried out in a greenhouse, from the Agro - Food Science and Technology Center of the Federal University of Campina Grande, Campus Pombal - PB, in a randomized complete block design in the 5 x 4 factorial scheme, corresponding to five levels of electrical conductivity of the irrigation water (70, 100, 130, and 160% of the recommended dose) with four replicates. The dose corresponding to 100% corresponded to 600 mg of nitrogen dm-3. The increase in the salinity of the irrigation water reduces the growth of "CMI 102" saplings, mainly to 135 DAE. Nitrogen fertilization doses varying from 420 to 960 mg N/dm3 did not promote significant alteration on the growth of saplings. The increase of nitrogen fertilization did not reduce the deleterious effect of salinity of irrigation water on the growth of saplings. The nitrogen dose of 420 mg of N/dm3 promoted the best growth in saplings.