Abstract
ABSTRACT. The objective was to study the processing of Vernonanthura discolor seeds, evaluating their physical and physiological qualities and defining parameters for purity analysis and determine the weight of one thousand seeds. The seeds extracted from the infructescences were processed in a blower, testing combinations of openings of the calibration valve and the side air passage. After processing, the seeds went through water content determination, germination tests, first count of the germination test, purity analysis, weight of one thousand seeds and percentage of full seeds. Compared to the control, seeds processed in a regulated blower with the calibrator valve in position 10 plus three 360° turns of side air passage obtained an approximately three-fold increase in germination and vigour and had 96% purity. We conclude that the processing of V. discolor seeds was best done by combining the rubbing of the seeds on circular sieves (1.8 and 1.6 mm in diameter) and then passage in an adjusted seed blower (calibration valve in position 10 plus three 360° turns of side air passage). The weight of one thousand seeds is 0.500 g, and the working sample for purity analysis must be 1.3 g.
Highlights
The objective was to study the processing of Vernonanthura discolor seeds, evaluating their physical and physiological traits, and to define parameters for purity analysis and determine the weight of one thousand seeds
The water content, germination and first count data from the germination test on Vassourão-preto seeds without processing and after processing was carried out on seedlots from different calibrations of the seed blower that consisted of combinations of openings of the calibration valve (CV) and the side air passage (SAP)
The evaluation of seed vigour, carried out on the first count of the germination test (Table 1), confirmed the results found for viability, which showed that the non-processed seeds were classified as lower quality, and the best performing treatments in the germination test had high vigour
Summary
Rob.) is a native species in the mixed rain forest and is typical of secondary vegetation, which is common in clearings and young forests (Siminski & Fantini, 2011). It is considered a pioneer plant with fast growth and is tolerant to low temperatures; it is considered an option for mixed plantings in permanent preservation areas to prepare the environment for the development of climax species. Processing may be classified as the set of operations that seek to improve physical purity, achieve a standard quality, preserve the germination percentage and avoid pests and diseases in the seeds The objective was to study the processing of Vernonanthura discolor seeds, evaluating their physical and physiological traits, and to define parameters for purity analysis and determine the weight of one thousand seeds
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