Tratamento de um solo salino-sódico com gesso e fontes orgânicas sob cultivo rotacionado de girassol – arroz

Abstract

An experiment was conducted in the period from 05/08/2011 to 09/25/2012, to evaluate the effects of organic gypsum and organic sources followed by continuous washing and cultivation of sunflower (Helianthus anus) cv 112/V-2000 and rice (Oryza sativa) Diamond variety in a sodic saline soil from the Irrigated Perimeter of São Gonçalo, Sousa municipality, Paraíba State, Brazil. The treatments were distributed in randomized blocks, with four replications, regarding to control (without gypsum and without any organic source), agricultural gypsum, bovine manure, rice husk, coconut husk, gypsum + bovine manure, gypsum + rice husk and, gypsum + coconuthuskl. The work is divided in three chapters. In Chapter - I, p. 15 – 54, are the data of pH, electrical conductivity of the saturation extract and exchangeable sodium percentage evaluated before the application of the treatments, after the washing of the soil, after the cultivation of sunflower and rice, respectively. The Chapter - II, p. 55 - 81, presents the results of growth and production of sunflower and the Chapter - III, p. 82 - 106, the growth data, macronutrients in leaf composition, sodium and grain yield.