Crescimento do milho sob doses de nitrogênio e salinidade da água de irrigação.

Abstract

Given the scarcity of water quality and excessive use of chemical fertilizers aimed of this research was to evaluate the growth of hybrid corn AG 1051 under nitrogen and different levels of irrigation water salinity in the Agrifood Science and Technology Center Federal University of Campina Grande, in a protected environment. The experimental design was a randomized complete block in a factorial 4 x 4, with treatments consisting of four levels of nitrogen fertilization (100; 150; 200 and 250% of the dose for testing vessel) corresponding to standard dose to 63 60 mg N / kg soil saline four levels (0.3, 0.8, 1.3 and 1.8 dS m-¹) in four repetitions. Corn responds to interaction between the factors for all variables (AF, NF, DC, AP, MSF, MSC and MSR); Nitrogen fertilization was effective in reducing the effects of salinity on the leaf area at doses 210, 180, 190 and 170% levels 0.3, 0.8, 1.3 and 1.8 dS m-1. Doses of 180 and 170% showed the best results for MSR. The dose of 150% N showed the best results for dry mass of leaves and stem.