Abstract The onion bulbs’ post-harvest quality is essential for good commercialization; the longest storage time is critical to the producer in choosing the cultivar. Thus, this work aimed to evaluate the post-harvest quality of onion bulbs under storage periods in a controlled environment. The experiment was installed in a factorial scheme (6x4), represented by six onion cultivars (BR29, Itajubá, Mulata, Omega, Rainha, and Salto Grande), evaluated in four storage periods (40, 80, 120, and 160 days), in a randomized design, with three replications. The parameters of fresh matter loss, skin strength, bulb firmness, skin shine, pH, soluble solids, titratable acidity, and soluble solids and titratable acidity were analyzed. The cultivar Salto Grande presented better conservation of the physical-defined characteristics in the post-harvest at controlled temperature, less loss of mass of fresh matter, and more significant maintenance of the feature of skin strength, bulb firmness, soluble solids, and titratable acidity. At the same time, cultivar BR29 showed more significant losses in the studied attributes and had less storage capacity among the evaluated cultivars.

ABSTRACT The importance of maintaining straw on the soil surface is a subject widely discussed and proven in the literature. However, the effects of this straw on planting efficiency and quality still lack information. In this sense, both time and method of the black oat management influence the permanence of the straw on the soil and, thus, can interfere in the next crop's germination and plantability of the seed drill. This study aimed to evaluate methods and times of black oat management and their implications on the plantability and development of the corn crop in succession in two harvests. A randomized block design with twelve treatments was used, consisting of the combination of three methods of management (crushed, rolled, and desiccated) and four times of management (0, 10, 20, and 30 days before the corn sowing) of black oat straw, arranged in a 3 x 4 factorial scheme, with four replications. The black oat management carried out 30 days before the corn sowing provides the highest corn emergence rate. Management methods that promote greater fragmentation of straw tend to offer less mechanical impediment to seedling development and result in a greater initial and final plant population.

ABSTRACT Onion production is conditioned to the adopted techniques during the cultivation. Sowing depth, soil preparation and cultivars are determinant factors for productivity to be increased. Two experiments were developed, the first with the objective of evaluating the effect of sowing depths and soil preparation methods on the germination and development of onion seedlings, while the objective of the second was to evaluate the productivity of onion cultivars as a soil preparation function. In experiment I, the split plot scheme was adopted, where the main plots consisted on soil tillage methods (total area and bed) and in the subplots, the sowing depths (0.5; 1.0; 1.5 and 2.0 cm), with six replicates. Experiment II was carried out in a split plot scheme, in which the main plots consisted on soil tillage methods (total area and bed) and in the subplots, such as onion cultivars (Itajubá, Rainha, Salto Grande, Ômega, Mulata and BR29), with four replicates. The 1.5 cm sowing depth provided greater speed of germination and plant stand. Raising beds offers the best initial seedling development. The onion cultivation under beds offers the highest vegetative development and productivity.