Crescimento e qualidade de porta-enxerto de aceroleira irrigado com águas salinas e adubação nitrogenada.

Abstract

The irrigation’s use promotes rational explotation of crops mainly into semi-arid region. However, the quantity and quality of water available for irrigation in this region presents great variability and, in many localities, only have salt water for irrigation. In this sense, the objective was to evaluate the effect of different levels of irrigation’s use) water associated to nitrogen rates under growth, phytomass production and quality of rootstock. The experiment was conducted in a greenhouse using a flavic sandy loam texture, located in municipality of Pombal-PB, using a 5x4 factorial scheme, distributed in a randomized complete block design with four replications, each plot consisting of two plants; (0.3, 1.3, 3.3, 4.3 and 4.3 dSm-1) who were prepared by addition of Na, Ca and NaCl, Mg, maintaining an equivalent ratio of 7: 2: 1, and by 4 nitrogen doses 70, 100, 130 and 160% N recommended dose for acerola seedlings. The dose of 100% corresponds to 600 mg of nitrogen dm3 (FERREIRA, 2014). Irrigation with CEa water of up to 1.93 dS m-1 promotes a maximum reduction of 10% in growth and rootstock of acerola in all periods studied. Dose of 420 mg of N dm-3 of soil promotes a larger number of leaves, as the dose of 762 mg of N dm-3 of soil promotes a larger diameter of stem of the CMI 102. Nitrogen increasing doses promote greater fresh aerial and Dickson quality index.