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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Item Technical and economic evaluation of different operating modes for mechanized fertilizer application in coffee plantations(Editora UFLA, 2020) Andrade, Alan Delon; Ferraz, Gabriel Araújo e Silva; Faria, Rafael de Oliveira; Barros, Murilo Machado de; Silva, Fábio Moreira da; Sarri, Daniele; Vieri, MarcoThe present study aimed to investigate the performance parameters and related costs of a machinery set composed of a tractor and a machine for fertilizers and soil correctives application, working in a coffee yard. It was evaluated two different operating modes. For the first operating mode (OM1), the machinery applied the total recommended dose to only one side of the plants and traveled in only half of the plot interrows. For the second operating mode (OM2), the machinery applied half the recommended dose to each side of the plants and traveled in all of the plot interrows. The study was performed at Bom Jardim Farm, located in the municipality of Bom Sucesso, state of Minas Gerais, Brazil. The performance parameters included effective field capacity and effective time. The hourly cost of the fertilizers and soil correctives application operation was determined based on the farm’s management data and the effective cost was obtained by relating the hourly cost and the effective time. The results showed that OM1 implies higher effective field capacity and lower effective cost, with the cost of only 50.1% of that found for OM2.Item Spatial variability of soil penetration resistance in coffee growing(Editora UFLA, 2018-07) Andrade, Alan Delon; Faria, Rafael de Oliveira; Alonso, Diego José Carvalho; Ferraz, Gabriel Araújo e Silva; Herrera, Miguel Angel Diaz; Silva, Fábio Moreira daThe intensive use of machines in agriculture tends to cause soil compaction, which can hamper the expansion of root system and the absorption of water and nutrients, thus affecting the crop development. In view of the above, the present study aimed to identify critical zones of soil compaction, through the spatial distribution of soil penetration resistance (SPR), having positions within the coffee rows and soil depth ranges as variables. The study was performed in a coffee plantation of 7.32 ha, belonging to the Bom Jardim Farm, located in the municipality of Bom Sucesso, MG, Brazil. The SPR was measured using a penetrometer in the depth range from 0 to 0.40 m, with discretization in four layers of 0.10 m. The data were interpreted based on geostatistics, in order to identify if there is spatial dependence of the SPR and generate thematic maps demonstrating the variable’s spatial behavior. It is concluded that there is spatial dependence of soil penetration resistance, being possible to use geostatistical tools to generate thematic maps based on classes of soil penetration resistance. The values of SPR in the tractor trail, for layers from 0.10 to 0.20 and from 0.20 to 0.30 m, were classified in the high SPR class and could cause damage to the crop.