Adubação potássica do coqueiro anão (Cocus nucifera L.) cultivado em solo sódico.

Abstract

In order to evaluate the potassium fertilization with potassium sulfate in the growth and production of green dwarf coconut tree grown in sodic soir. The experiment was conducted during the months of January 2013 to January 2016 in Sector 7 (seven) in Floodplains of Sousa -- PB, Brazil. We used coconut plants belonging to green dwarf variety, spaced rectangular formation 7.0 x 7.0 m, starting the third year in production stabilization. The experimental design was a randomized block, evaluating ave leveis of potassium sulphate (K2SO4) (0.0, 0.52, 1 .04, 2.08 and 4.16 kg plant'l year'l), four replicates and four plants per repetition, totaling 80 experimental units. The plants were conducted for three years and potassium leveis were divided unto intervals of 90 days between each applicatlon, totaling 12 applications over the conduct of the experiment. The variables in the experiment were: stipe height, diameter of the stem, fruits per plant, equatorial circumference of the fruits, fruit weight, water volume and total soluble solids. The K2SO4 doses positively influenced the growth and the production of green dwarf coconut tree. The biggest growth in height and diameter of coconut strain is obtained in the dose of 4.16 kg plant'l year'l of K2SO4. The best productive aspects in the first year of production are obtained with doses of 2.08 to 2.81 kg plant'l year'l of K2SO4.