SciELO - Scientific Electronic Library Online

vol.34 issue1Productivity and economic feasibility of sugar cane in different systems of tillage in west-central BrazilInfluence of application of Cyproconazole+Thiamethoxam on growth of seedlings Coffea Canephora Pierre Ex A.Froehner author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


Revista de Ciências Agrárias

Print version ISSN 0871-018X


PRADO, Renato Mello  and  VARA, Esteban Alcántara. Influence of nitrogen forms and ph in the correction of iron deficiency in sunflower. Rev. de Ciências Agrárias [online]. 2011, vol.34, n.1, pp.212-219. ISSN 0871-018X.

The objective was to evaluate the effect of using a nutrient solution with acid, ammonium nitrate and foliar application of acid solution in sunflower plants with iron deficiency. The experiment was performed with the culture of sunflower (Sungro 393) in slow growth of the Laboratory of Plant Nutrition, University of Cordoba, Spain. Initially the plants were cultivated for 11 days in pots containing 0.5 L of nutrient solution (40 mM Fe). Then the plants were subjected to stress, renewing with the same nutrient solution, decreasing the concentration of 5 mM Fe and adding 15 mM NaHCO3 and CaCO3 0.5 g L-1. In plants with iron deficiency, was submitted to five treatments, consisting of (a) control without Fe, maintaining the same nutrient solution before (b) nitrate nutrient solution with 2 mM Ca (NO3)2, (c) nutrient solution with ammonium 2 mM (NH4)2SO4 (d) nutrient solution with dilute HCl, pH 3.5 (e) spraying the leaves with 0.5 mM H2SO4 and with five replications. We conducted assessment of indirect measurement of chlorophyll and the measured pH value of the nutrient solution, from 0, 2, 5 and 7 days after treatment application and at last assessment was conducted on the foliar analysis by determining the Fe and total plant dry matter. The use of ammonium nutrient solution decreased the pH of nutrient solution and increased the leaf content of iron and the SPAD value of leaves, eliminating the visual symptoms of iron deficiency in sunflower. The use of ammonium in nutrient solution for seven days, was more effective in correcting iron deficiency in sunflower plants, compared with nitrate and with dilute acid at pH 3.5 and acidic leaf.

Keywords : iron chlorosis; micronutrient; nutritional disorder.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License