CORREÇÃO DE SOLO SALINO-SÓDICO COM CONDICIONADORES E DOSES DE FÓSFORO PARA CULTIVO DO SORGO SACARINO

Abstract

The objective of this work was to evaluate soil chemical attributes, emergence and initial growth of sorghum plants in sodium saline soil treated with gypsum and elemental sulfur under different doses of phosphorus. The experiment was arranged in 2 x 5 factorial scheme, in a randomized complete block design, with two treatments of saline-sodium soil (gypsum and elemental sulfur) and 5 doses of simple superphosphate (0.0, 50, 0, 100.0, 150.0 and 200.0 mg dm-3), with 3 replicates, making up 30 experimental units, each plot being represented by two vessels. For this, samples of a saline-sodium soil were submitted to correction with gypsum and elemental sulfur at 100% of the need for gypsum, and subsequent washing with twice the volume of pores, and fertilization with different doses of phosphorus. After 20 days of fertilization, three sorghum seeds were sown in each pot. Sorghum sorghum plants were harvested for 30 days after sowing, and evaluated for emergence, growth and phytomass accumulation, after collecting the biometric data, soil samples were collected for chemical characterization. The elemental sulfur is more efficient in the reduction of soil salinity and sodicity in relation to agricultural gypsum. The dose of 90 mg dm-3 of single superphosphate provided the best emergence, growth and phytomass accumulation in sorghum plants cultivated in soils corrected with gypsum and elemental sulfur.