ABSTRACT. Influence of displacement speed in the performance of a precision no-till planter in northern Rio de Janeiro State. The objective of this work was to evaluate the influence of displacement speed in the performance of a no till planter. The tests were performed in the experimental area of the Universidade Estadual do Norte Fluminense Darcy Ribeiro, located in Campos dos Goytacazes, Rio de Janeiro State, Brazil. The experiment was carried out in a randomized block design, using two speeds of 2.5 and 4.4 km h -1 , with 16 replications. For sowing, the UENF 506-8 hybrid corn, with row spacing of 0.9 m and theoretical 11 cm spacing between seeds was used. When the displacement speed was intensified, there was an increase in planter wheel slippage, effective field capacity, planting depth, plate distribution mechanism speed and the occurrence of doubles. There was a decrease in the number of seeds per meter and exposed seeds with an increase in planter speed. The seeds that did not pass through the plate distribution mechanism reached a germination rate of 98%, while, both in speeds of 2.5 and 4.4 km h -1 they showed 95.3% germination, which represents a reduction of 2.7% due to mechanical damage caused by the planter plate distribution mechanism.
Seed quality is a key factor to succeed in a yield generation and storage is an important activity to control the physiological seed quality, as it preserves seed viability while maintaining its robustness at a reasonable level between planting and harvest. On this basis, the goal of this study was to evaluate the physiological quality of snap bean seeds stored in different types of packages and storage conditions. Eight genotypes comprising six lines and two controls were analyzed. It was applied a completely randomized block design with four replicates in a factorial scheme (8×2×2×7).Seed storage was performed in permeable and impermeable packages under controlled and uncontrolled conditions. The physiological seed quality was evaluated by means of germination and vigor tests. The different types of package and storage conditions influenced the physiological seed quality. Under controlled storage conditions, the permeable and impermeable packages were more efficient in controlling the physiological quality of snap bean seeds.
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