RESUMO:O objetivo deste trabalho foi avaliar a demanda energética requerida por uma semeadoraadubadora disponível comercialmente para plantio direto, submetida a quatro velocidades de deslocamento e três condições de cobertura do solo na implantação da cultura da soja. O experimento foi conduzido no Sítio Cazarotto, localizado no Distrito de Iguatemi, município de Maringá -PR, em Latossolo Vermelho distrófico. Utilizou-se de delineamento de blocos ao acaso, em arranjo de parcelas subdivididas, em que os tratamentos principais foram três condições de cobertura do solo (vegetação espontânea, aveia dessecada e aveia dessecada + rolada) e as secundárias, quatro velocidades de deslocamento (4,7; 5,4; 6,5 e 7,2 km h -1 ). As variáveis estudadas foram: força na barra de tração, potência requerida, patinagem do rodado traseiro do trator e consumo de combustível. A força de tração foi influenciada pela velocidade de deslocamento e pelas condições de cobertura. A patinagem dos rodados do trator não foi influenciada pelos tratamentos. O consumo horário de combustível foi maior na condição de cobertura vegetação espontânea.PALAVRAS-CHAVE: força de tração, potência requerida, consumo de combustível. SEEDER ENERGETIC DEMAND IN SOYBEAN CULTURE IMPLANTATION UNDER DIFFERENT DISPLACEMENT SPEEDS AND SOIL COVERINGSABSTRACT: The objective of this work was to evaluate request energetic demand by a seeder offered commercially for no-tillage, submitted to four displacement speeds and three soil covering conditions in soybean culture implantation. The experiment was installed at the Cazarotto Small Farm, located in Iguatemi District, municipal district of Maringá -PR, Brazil, in Haplotox Soil. It was used split-plot design. The main treatments were three soil-covering conditions (spontaneous vegetation, black oat desiccated and black oat desiccated + rolled) and the secondary ones, the four forward speeds (4.7; 5.4; 6.5 e 7.2 km h -1 ). The studied variables were draw bar pull, power requirement, and wheel drive slip and consumption fuel. The draw bar pull was influenced by the forward speed and for the soil covering conditions. The wheel drive slip was not influenced by the treatments. The hourly fuel consumption was larger in the spontaneous vegetation covering condition.
ABSTRACT. Seeder-fertilizer energetic demand under different forward speeds and vegetable covering types in no-tillage soybean. The aim of this work was to evaluate the pneumatic seeder energetic demand, submitted to three forward speeds, under different soil covering conditions, in soybean culture seedling. The experiment was carried out in HAPLOTOX Soil under no-tillage system, 8 years ago. The experimental design was splitsplot, with four replications. The treatments were a combination of forward speeds (5.56; 8.10 e 10.21 km h -1 ) and covering conditions of the soil (spontaneous vegetation, oat black desiccated and oat black desiccated and rolled). The results showed that medium and maxim draw bar pull, as well as power requirement, were influenced by the type of soil covering and forward speed. The covering type did not influence fuel consumption, although the forward speed did. The wheel drive slip was not influenced by any of the studied factors.
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