ABSTRACT. Curves of crop growth and nutrient extraction and export are essential to develop fertilization strategies and management plans to maximize yield and reduce environmental impacts. Our study aimed to evaluate dry matter production and both extraction and export of macronutrients by arrowroots (Maranta arundinacea L.) to be used in further crop fertilization plans. To this purpose, two experiments were carried out in field conditions using the varieties Viçosa and Seta. The experimental design was randomized with four replications and nine periods of analysis, which were defined as days after planting (105, 135, 165, 195, 225, 255, 285, 315, and 345 DAP). Dry matter, extraction, and export of macronutrients by arrowroot seed-rhizomes, aerial parts, roots, and storage roots (rhizomes) were determined. The exports of N, P, K, Ca, Mg, and S of storage rhizomes of the variety Viçosa were 104.6, 51.83, 412.24, 15.85, 36.14, and 64.36 kg ha-1, while those of the seta variety were 160.6, 71.62, 521.31, 17.57, 60.09, and 160.41 kg ha-1, respectively. Both varieties proved to be efficient soil macronutrient extractors, mainly for K. The variety Seta had higher shoot, root, seed-rhizome dry matter contents, as well as greater macronutrient extractions and exports.

Abstract The present study aimed to evaluate the storage fruit potential of sour passion fruit progenies at temperatures of 7, 14 and 25 °C. The fruits were harvested at 30% yellow peel color, selected, sanitized and stored under refrigeration in chambers with relative humidity of 80% (± 5%) for a period of 12 days. The experiment was installed in a factorial scheme (3 × 3 × 4), with three progenies selected in the breeding program (P42, P45 and P49), three storage temperatures (7, 14 and 25 ° C) and four evaluation periods (0, 4, 8 and 12 days after storage). Analyzes of fruit mass, pulp mass, pericarp mass, pulp yield, pericarp thickness, water loss, soluble solids content, titratable acidity and ascorbic acid content were performed. There were significant differences among the studied progenies, P49 showed better traits than the other progenies, mainly regarding the resistance to water loss, the main trait that affects the quality of the fruits. Storage at 14 °C for twelve days is feasible to maintain the quality of sour passion fruit. The temperature of 7 °C inhibits the ripening of the fruits and promotes dehydration, confirming the non-recommendation of storage in this condition.

Abstract The objective of this study was to determine the storage efficiency and reconditioning of potato cv. Innovator for processing. Tubers were stored at 6, 7 and 8 °C in the dark for 30, 60, 90, 120 and 150 days and reconditioned at 15 °C for 15 days. TRS and RS were reduced as storage temperature increased from 6 + 15 °C to 8 + 15 °C. Regardless of temperature and storage time, sugar contents were suitable for industry; however non-enzymatic browning remained in category 2 for up to 60, 90 and 150 days in tubers stored at 6 + 15 °C, 7 + 15 °C and 8 + 15 °C, respectively. Starch was influenced by storage time, despite the absence of temperature effect. Regardless of the temperature, sprouting started at 90 days, but the growth of shoots was directly proportional to the increase in temperature. The PPO and POD increased at the beginning of storage but did not cause darkening before the frying. Reduction in storage temperature followed by reconditioning did not delay the onset of sprouting, but reduced the size of sprouts, maintained adequate sugar levels, however it promoted non-enzymatic browning.