Produção de mudas enxertadas de goiabeira irrigadas com águas salinizadas e doses de nitrogênio.

Abstract

The pressure for good quality water has forced the use ofwater resources with different leveis of salinity. The use of those waters is subject to the crop tolerance to salinity and adequate irrigation management and other cultural practices, reducing the effects of salinity on the environment. This work aimed to evaluate the growth variables and fresh weight training and dry and physiological seedlings grafted guava submitted to increasing leveis of nitrogen irrigated with differing leveis saline waters. The experiment was conducted in a greenhouse Science Center and Technology Agrifood the Federal University of Campina Grande. Pombal - PB, in a randomized blocks in a factorial 5 x 4, with corresponding treatments to ave leveis of electrical conductivity water - ECw(0.3, 1.1, 1.9, 2.7 and 3.5 dS m'l) and four doses of nitrogen(70%. 100%, 130% and 160% N dose recommended for production of guava plants). with four replications, each plot had three plants. Increased ECw from 0.3 dS m'l adversely affects linearly the branch length, transpiration rates and stomatal conductance sheet guava grafted seedlings cv. Paluma 70 days after grafting. The dry mass of root and total dry obtains higher values in ECw levei of 2.1 dS m'l. Nitrogen fertilization at the rate of 70% N stimulates greater production number of leaves per plant at 70 DAE. Water with ECw 3.5 dS m'l did not affect the number of leaves. stem diameter. leaf área and dry mass of shoots and the 50 and 70 DAE.