OPERATIONAL PERFORMANCE OF AN AGRICULTURAL TRACTOR UNDER DIFFERENT TIRE INFLATION PRESSURES IN THE SUBSOILING OPERATION

For the agricultural tractor's best performance, it must be correctly adapted to the job. Among other factors, the adequacy of tire inflation pressure is one of the most important and may influence the operation's efficiency and productivity. This study aimed to evaluate an agricultural tractor's operational performance with different tire inflation pressures in the subsoiling operation. The study was carried out in an experimental area of the Agricultural Machinery and Mechanization Laboratory of the experimental farm “Água Limpa,” belonging to the University of Brasília. The experimental design used was in randomized blocks with the following values, 206.8 kPa (30 psi), 137.9 kPa (20 psi), and 68.9 kPa (10 psi), of inflation pressure for agricultural tractor tires. The mechanized set used was a tractor model TM7020 2WD MFWD pulling a subsoiler with five shanks, SPCR model, in a Latossolo Vermelho-Amarelo. The higher inflation pressure resulted in greater slippage, advance, hourly fuel consumption, and lower speed and operational field capacity.

SEMEADURA DE SOJA EM FUNÇÃO DE MECANISMOS DOSADORES E VELOCIDADE OPERACIONAL

SEMEADURA DE SOJA EM FUNÇÃO DE MECANISMOS DOSADORES E VELOCIDADE OPERACIONAL TIAGO PEREIRA DA SILVA CORREIA1, ARTHUR GABRIEL CALDAS LOPES1, FRANCISCO FAGGION1, PAULO ROBERTO ARBEX SILVA2, SAULO FERNANDO GOMES DE SOUSA3 1 Faculdade de Agronomia e Med. Veterinária, Universidade de Brasília, Brasília, Distrito Federal, CEP70910-900, Brasil, [email protected], [email protected], [email protected] 2 Faculdade de Ciências Agronômicas, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Botucatu, São Paulo, Brasil, [email protected] 3 Agroefetiva consultoria Ltda, Botucatu, São Paulo, Brasil, [email protected] RESUMO: Dentre os mecanismos distribuidores de sementes disponíveis ao produtor de grãos, o de disco horizontal é amplamente utilizado, podendo ser convencional ou com tecnologia Titanium. Independentemente da escolha, ambos devem proporcionar correta distribuição longitudinal de sementes no sulco de semeadura, sendo assim, o objetivo deste trabalho foi avaliar a distribuição longitudinal de sementes de soja por mecanismo dosador de disco horizontal convencional e Titanium em diferentes velocidades de semeadura. O experimento foi realizado em campo experimental do Laboratório de Mecanização Agrícola da Universidade de Brasília. O delineamento experimental utilizado foi inteiramente casualizado em esquema fatorial 2 x 3, sendo dosadores de sementes (convencional e Titanium) e velocidades de semeadura (4,5, 6,2 e 8,2 km h-1), com quatro repetições. Foram realizadas avaliações de espaçamentos aceitáveis, falhas e duplas; índice de precisão e desempenho qualitativo dos dosadores. Os dados foram submetidos à análise de variância e comparação de médias pelo teste de Tukey (p ≤ 5%). Velocidade de semeadura maior que 4,5 km h-1 provoca maior índice de falhas e duplas e diminui a precisão dos dosadores de disco horizontal. A 8,2 km h-1, o índice de aceitáveis do Titanium é 17% maior, falhas 33% menor e a precisão 19,8% maior. Palavras-chaves: distribuição longitudinal, falhas, plantabilidade, Titanium. SOYBEAN SOWING IN FUNCTION OF DOSING MECHANISMS AND OPERATIONAL SPEED ABSTRACT: Among the seed distribution mechanisms available to the grain producer, the horizontal disc is widely used, and can be conventional or with Titanium technology. Regardless of the choice, both should provide correct longitudinal distribution of seeds in the sowing furrow, therefore, the objective of the work was to evaluate the longitudinal distribution of soybean seeds per conventional horizontal disc dosing mechanism and Titanium at different sowing speeds. The experiment was carried out in an experimental field at the Agricultural Mechanization Laboratory at the University of Brasília. The experimental design used was completely randomized in a 2 x 3 factorial scheme, with seed dosing device (Conventional and Titanium) and sowing speeds (4.5; 6.2 and 8.2 km h-1), with four replications. Evaluations of acceptable, failure and double spacing were performed; precision index and qualitative performance of dosing device. The data were subjected to analysis of variance and comparison of means by the Tukey test (p ≤ 5%). Sowing speed greater than 4.5 km h-1 causes a higher rate of failures and doubles and decreases the precision of the horizontal disk dosing. The speed of 8.2 km h-1 the acceptable rate of Titanium is 17% higher, failure is 33% lower and the precision 19.8% higher. Keywords: longitudinal distribution, flaws, plantability, Titanium.

INVESTIGATION OF THE CONSTRUCTIVE PARAMETERS OF THE MODERNIZED HORIZONTAL MIXTURE

The final operation of feed mixtures preparation is the mixing of components in special devices - mixers of batch or continuous type. From the zootechnical point of view, it is important not only to introduce the components in the feed mix into the required ratio, but it is also necessary that they are evenly distributed throughout the mixture. It is especially important to distribute in the mass of the feed mixture components that are introduced in small amounts and have high feed value or biological activity: mixed fodders, protein-vitamin supplements (PVS), premixes, vitamins, trace elements, medicines, etc. In the Livestock mechanization Laboratory of North-East scientific research Institute of agriculture the theoretical and experimental studies of a horizontal auger belt auger are carried out. The results of experimental studies show that the maximum value of the homogeneity coefficient of the finished product is nn=83.57%, with the flow capacity of the mixer being equal to Q=5.75 tons per hectare, specific energy consumption q=1.67 kilowatt per ton.