Abstract

The pineapple (Ananas comosus L.), originally from South America, is the third most produced fruit in Brazil. The potassium nutrient plays a fundamental role on the fruit quality. The objective of this study was to evaluate the influence of potassium doses applied to the soil on fruit yield and on the physical and chemical characteristics of the Pérola pineapple cultivar. The design used randomized block design with four repetitions; the treatments consisted of five doses of K₂O: 0; 222; 444; 666 and 888 kg ha⁻¹ applied in the form of potassium chloride, divided into two applications, after floral induction. The evaluated variables were: fruit yield per hectare and pulp, fruit and crown fresh mass, fruit diameter, fruit and crown lengths, titratable acidity, soluble solids, vitamin C, juice pH and soluble solids/titratable acidity ratio. Potassic fertilization increased the yield of both fruit and pulp per hectare, the fruit and crown fresh mass, the diameter of the fruit, the lengths of the fruit and crown, titratable acidity, soluble solids, vitamin C and decreased the ratio of soluble solids to titratable acidity in the juice. The rise in potassium nutrition improves the quality and yield aspects of the pineapple ‘Pérola’ fruit.

摘要

菠萝（Ananas comosus L。）原产于南美，是巴西第三大产果。钾营养素对水果品质起着根本性的作用。这项研究的目的是评估施钾于土壤上的钾肥对水果产量以及培洛拉菠萝菠萝品种理化特性的影响。该设计使用了随机重复的块设计，具有四个重复。治疗包括五剂K ₂ O：0；222; 444；666和888 kg公顷^-1在花粉诱导后以氯化钾的形式施用，分为两次施用。评价的变量为：每公顷和果肉的水果产量，水果和冠的新鲜质量，水果直径，水果和冠的长度，可滴定的酸度，可溶性固形物，维生素C，果汁pH值和可溶性固形物/可滴定的酸度比。钾肥增加了每公顷水果和果肉的产量，水果和冠的新鲜质量，水果的直径，水果和冠的长度，可滴定的酸度，可溶性固形物，维生素C，并降低了可溶性固形物与果糖的比例。果汁中可滴定的酸度。钾营养的增加改善了菠萝“Pérola”水果的品质和产量。