DESEMPENHO OPERACIONAL E CUSTO DA SUBSOLAGEM COM E SEM RODADO DUPLO NO TRATOR AGRÍCOLA ARTHUR GABRIEL CALDAS LOPES1, TIAGO PEREIRA DA SILVA CORREIA1, GUILHERME RODRIGUES DE BRITO1, ALEXANDRE PINTO FERREIRA DE ALMEIDA FARIA1, PAULO ROBERTO ARBEX SILVA2 1Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Universitário Darcy Ribeiro ICC – Asa Norte, Cep: 70910-900, Brasília/DF, Brasil. E-mail: arthur.grb10@gmail.com, tiagocorreia@unb.br, guilhermexiiv@gmail.com, alexandreagro20@gmail.com 2Departamento de Engenharia Rural, Universidade Estadual Paulista, Av. Universitária, nº 3780, Altos do Paraíso, Cep: 18610-034, Botucatu/SP, Brasil. E-mail: paulo.arbex@unesp.br RESUMO: A descompactação dos solos agrícolas pode ser realizada com diferentes números de rodados do trator agrícola. O objetivo do trabalho foi avaliar o desempenho operacional e econômico da operação de subsolagem utilizando trator agrícola equipado com e sem rodado duplo traseiro. O experimento foi realizado na Fazenda Experimental Água Limpa, pertencente a Universidade de Brasília. O delineamento experimental utilizado foi o inteiramente casualizado em arranjo fatorial 2 x 3 (Duas configurações de rodado, simples e duplos; e três velocidades operacionais, 3,2; 4,2 e 4,9 km h-1), com quatro repetições. O subsolador utilizado foi o modelo SPCR com cinco hastes e ponteiras sem asa, tracionado por um trator modelo TM7020 (4 x 2 TDA) com 109,58 kW de potência. Foram avaliadas a resistência mecânica do solo a penetração (RMP), consumo horário de combustível (Chc) e patinagem dos rodados, capacidade de campo efetiva (Cce) e custo horário (CH). Os dados foram submetidos a análise de variância e as médias comparadas pelo teste de Tukey (P ≥ 0,05). Concluiu-se que a subsolagem com rodado duplo e menor velocidade possibilita menor patinagem, Chc e CH. A Cce foi maior com rodado duplo e maior velocidade. Palavras-chaves: consumo de combustível, patinagem, subsolador. PERFORMANCE OPERATIONAL AND SUBSOILING COST WITH AND WITHOUT DOUBLE WHEELS IN THE AGRICULTURAL TRACTOR ABSTRACT: Agricultural soils decompaction can be carried out with different numbers of wheels on the agricultural tractor. The aim of the work was to evaluate the operational and economic performance of subsoiling operation using an agricultural tractor equipped with and without rear double wheels. The experiment was carried out at Fazenda Experimental Água Limpa, belonging to the University of Brasília. The experimental design used was completely randomized in a 2 x 3 factorial arrangement (two wheel configurations: single and double; and three operational speeds, 3.2; 4.2 and 4.9 km h-1), with four repetitions. The subsoiler used was the SPCR model with five rods and tips without wing, pulled by a tractor model TM7020 (4 x 2 TDA) with 109.58 kW of power. Soil mechanical resistance to penetration (RMP), hourly fuel consumption (Chc) and slip, effective field capacity (Cce) and hourly cost (CH) were evaluated. The data were subjected to analysis of variance and the means compared by the Tukey test (P ≥ 0.05). It was concluded that subsoiling with double wheels and lower speed allows less slip, Chc and CH. The Cce was bigger with double wheels and higher speed. Keywords: fuel consumption, slip, subsoiler.
Stump extraction can be carried out in different ways, among which the mechanized removal is the most usual in the forestry sector. Information regarding the operation with cutting implements is important in the context of decision taking, operational and economic optimization of the activity. The objective of this work was to evaluate the operational performance and mechanized costs of different stump extractors implements in an eucalyptus harvested area. The work was carried out in an Eucalyptus urograndis clones harvested area where the treatments adopted for removal were the following: agricultural tractor + shredder head (T1), excavator + shovel bucket (T2); excavator + shredder head (T3), excavator + stump shear (T4) and bulldozer mat + stump pullers (5). The experimental design was the completely randomized, with four replications per treatment, where it was evaluated the operational efficiency (Ef), operational field capacity (Ofc), extraction productivity (Ps), hourly fuel consumption (Fch), hourly cost (HC), operational (OC) and by extracted stump (SC). For the conditions of the work, the T5 was the one with the highest Ef, Ofc, and Ps, lowest OC and SC.
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