CORREÇÃO DE SOLO SALINO-SÓDICO COM SOLUÇÕES DE CLORETO DE CÁLCIO CULTIVADO COM SORGO SUDANENSE

Abstract

The work was developed in a greenhouse, with the objective to evaluate the behavior of Sudan sorghum in one normal and another saline-sodic soil treated with increasing concentration solutions of calcium chloride. Two samples of Alluvial Soil proceeding from the half-barren part of Paraíba, Brazil, with salinity and sodicity problems had been used. The physical and chemical characterization of soil samples was carried and was mounted an experiment in randomized block type, at 2 x 6 factorial arrangement, being two soils and six solutions of calcium chloride with increasing concentrations, in three replicates. The soil had been conditioned in polyethylene vases with 5,0 kg of capacity, being submitted to the ticket of the solutions during sixty days, being then made a sampling for determination of the exchangeable sodium and the calculation of ESP. After this period, was planted one sorghum tolerant cultivar to salinity, being continued the ticket of the solutions under daily irrigation. At 60 days of application of calcium chloride solutions, it was observed that it had a reduction of the ESP, which continued being reduced until the 120 days, mainly for the saline-sodic soil, correcting the sodicity partially. The effect of the salinity had been evident in sorghum cultivated in saline-sodic soil, with problems since the germination in the treatments of lesser calcium chloride concentration, with improvement in the growth of the plants in the intermediate levels and decrease in the last level, probably, for the raised saline concentration, reflecting in the height of the plants and the production of dry matter.