Utilização de Kieserita em citros cultivado na região nordeste do Pará.

Abstract

Magnesium (Mg) is one of the essential macronutrients used in large quantities by plants for their reproductive development, as well as exerting important functions in the biochemical and physiological processes in plants. Sulfur is the thirteenth most abundant element of the earth's crust, plays a fundamental role for plants, vegetative formation and fruiting, oil and protein contents, and contribute to the symbiotic fixation of nitrogen by legumes. The objective of this work was to evaluate the behavior of soil chemical attributes, vegetative, nutritional development, productivity and fruit quality of orange trees in Dystrophic Yellow Latosol. The experimental design was a randomized complete block design with three replicates, each replicate per block was composed of 16 plants of the "Pêra rio" variety, with four years of age, spaced 7 m between rows and 4 m between plants. Treatments consisted of five doses of Kieserite (0, 280, 560, 840 and 1120 g / plant). Soil samples were collected before application and foliar tissue after application, at 6 and 12 months after fertilization, the fruits then collected, evaluating the diameter, mass, length, volume, thickness of the total soluble solids (ºBrix), Total acidity (pH) and productivity; (PH, Ca, P, K, Mg, and CTC), as well as foliar concentrations of K, Ca, Mg and S. The results were submitted to statistical analysis using the statistical software SISVAR. The application of Kieserita provides positive results for the physical-chemical variables of the fruit, except for the fruit length and pH variables. Kieserite promotes increases in soil chemical attributes (pH, P, K, Mg, and CTC), except for the Ca content, regardless of the period evaluated. The leaf contents of Mg and S increased with the doses of kieserite. On the other hand, the levels of K and Ca in the leaf vary with the applied doses.