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| Leite,Daniel M.; Fernandes,Haroldo C.; Teixeira,Mauri M.; Cecon,Paulo R.; Furtado Júnior,Marconi R.. |
| ABSTRACT The objective of this study was to evaluate and model the traction performance parameters of a tractor 4x2 FWD, according to the tractor speed, the internal pressure and the type of tires construction. For each type of tire construction was assembled an experiment in which we evaluated the influence of internal pressures of the front and rear tires and the speed of the mechanical assembly. It was found that the sliding of the diagonal run, presented significant effect in all variables analyzed, since the radial showed no influence of the factors evaluated. The power available in the drawbar was higher when the tractor was equipped for radial tires. The response variables, fuel consumption schedule and specific fuel consumption were more sensitive... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Harrow disc; Instrumentation; Traction performance. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300484 |
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| Feitosa,Jardênia R.; Fernandes,Haroldo C.; Cecon,Paulo R.; Leite,Daniel M.; Nery,Filipe M. T.; Pereira,Janielle S.. |
| ABSTRACT Excessive tillage operations under inadequate conditions can raise the cost of agricultural production and lead to soil degradation without adequate crop response. The objective of this study was to evaluate the onion crop response to soil water contents and tillage systems. Three tillage systems were evaluated: P1 (plowing + two harrowings + two seedbed raising operations), P2 (two harrowings + one seedbed raising operation), P3 (one harrowing + one seedbed raising operation); and four soil water contents: 12, 15, 23 and 26%. The experiment was conducted in the irrigated perimeter of Tourão, Juazeiro, BA, Brazil (9° 24’ 7.3” S; 40° 26’ 8.7” W and altitude of 368 m), in 2017, and was installed in split plots, in a randomized block design, with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Horticulture; Seeding; Agricultural mechanization. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000200115 |
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