Modelagem matemática para seleção de conjuntos mecanizados agrícolas pelo menor custo operacional

Baio, Fábio Henrique Rojo; Rodrigues, Andrew Diogo; Santos, Gilson Saturnino dos; Silva, Simone Pereira da

doi:10.1590/s0100-69162013000200018

Cited by 18 publications

(14 citation statements)

References 7 publications

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“…It was considered the time available (TA) in the accomplishment of each agricultural operation in the calculation of the operational rhythm (OR), according to the methodology presented by Baio et al (2013), extrapolating the number of mechanized sets from the reference field in PA (91 ha) to the total area of the property in 3,500 ha. The technical specifications of the machines have been obtained from the manufacturers' prospectuses.…”

Section: Subject Descriptionmentioning

confidence: 99%

Financial Analysis of the Investment in Precision Agriculture Techniques on Cotton Crop

et al. 2017

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ABSTRACT:The aim of this study was to evaluate a financial analysis by the use of precision agriculture (PA) techniques on cotton crop. The experiment was carried out in a cotton field of 91 ha and its result compared to another field with similar area, cultivated with the conventional agricultural techniques. The financial analysis was extrapolated to the total farm area of 3,500 ha. All agricultural inputs applied, during the 2013/14 cotton crop season were analyzed, as well as their costs. The use of precision agriculture techniques over the cotton crop reduces production costs in 6.6%, increases the profitability index and operating profit in 3.3% and 7.9% respectively, when compared to conventional agriculture. The fertilizer application in variable rate, using precision agriculture, provides 41% of costs reduction with these inputs. Profitability and investment analysis indicators demonstrate economic feasibility and return over investment to both production systems (precision agriculture and conventional) over the cotton crop production, however, the use of precision agriculture techniques shows higher economic viability and smaller return over investment time, even having higher initial costs with machines, sensors and maps production.

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Section: Subject Descriptionmentioning

confidence: 99%

Financial Analysis of the Investment in Precision Agriculture Techniques on Cotton Crop

et al. 2017

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“…The best model selection, the one developed aiming the selection of an optimal solution (BAIO et al, 2013) was performed on the basis of simple indicators, considering: the data convergence, the determination coefficient (R 2 ) and the sum of residual squares (SRS). In this study, weight and mass are considered synonymous.…”

Section: Methodsmentioning

confidence: 99%

Mathematical modeling applied to the growth of tilapia in net cages in the sub middle of the São Francisco river

et al. 2014

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This study aimed to apply mathematical models to the growth of Nile tilapia (Oreochromis niloticus) reared in net cages in the lower São Francisco basin and choose the model(s) that best represents the conditions of rearing for the region. Nonlinear models of Brody, Bertalanffy, Logistic, Gompertz, and Richards were tested. The models were adjusted to the series of weight for age according to the methods of Gauss, Newton, Gradiente and Marquardt. It was used the procedure "NLIN" of the System SAS® (2003) to obtain estimates of the parameters from the available data. The best adjustment of the data were performed by the Bertalanffy, Gompertz and Logistic models which are equivalent to explain the growth of the animals up to 270 days of rearing. From the commercial point of view, it is recommended that commercialization of tilapia from at least 600 g, which is estimated in the Bertalanffy, Gompertz and Logistic models for creating over 183, 181 and 184 days, and up to 1 Kg of mass , it is suggested the suspension of the rearing up to 244, 244 and 243 days, respectively. KEYWORDS: economy, equations, Oreochromis niloticus. MODELAGEM MATEMÁTICA APLICADA AO CRESCIMENTO DE TILÁPIAS EM TANQUES-REDE NO SUBMÉDIO DO SÃO FRANCISCO RESUMO: Este estudo teve como objetivo aplicar modelos matemáticos ao crescimento de tilápias-do-nilo (Oreochromis niloticus) criadas em tanques-rede no

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“…Among the harvesting stages, gathering of fallen fruits in the soil is notable for having a high cost per harvested unit, mainly due to the low operational field capacity (Tavares et al, 2015). Baio et al (2013) point out that to reduce the costs of operations, we can increase the operational capacity or adjust the sets used for each operation, allowing reducing the demand for machinery and obtaining lower fuel consumption.…”

Section: Introductionmentioning

confidence: 99%

Effective Power and Hourly Fuel Consumption Demanded by Set Tractor- Coffee Harvester in Function of Adequacy Tractor Ballasting

et al. 2017

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ABSTRACT:The mechanized gathering process of sweeping coffee is extremely important to reduce the losses of fruit not used in the harvesting operation. But this operation usually has a low operational performance and a high cost per unit collected in this way any measures that can effectively reduce costs increase the viability of the operation. In this sense, studies on adequacy tractor mass for each operation show improvement in energy use, reducing fuel consumption. So, this study aimed to quantify the fuel consumption and effective power along the process of a tractor 4x2 FWD pulling the coffee harvester. I was used as treatments three ballasting settings, these being equivalent the relations power to weight of 36, 39 and 42 kg hp -1 working with and without activated FWD, randomized statistically, with 10 repetitions each configuration. It was conclude that, at low power-weight ratio, the front wheel drive assist had no significant influence on the hour fuel consumption. Already in the configuration with higher ratio, the use of front wheel drive favored in reducing fuel consumption and better energy use.

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Modelagem matemática para seleção de conjuntos mecanizados agrícolas pelo menor custo operacional

Cited by 18 publications

References 7 publications

Financial Analysis of the Investment in Precision Agriculture Techniques on Cotton Crop

Financial Analysis of the Investment in Precision Agriculture Techniques on Cotton Crop

Mathematical modeling applied to the growth of tilapia in net cages in the sub middle of the São Francisco river

Effective Power and Hourly Fuel Consumption Demanded by Set Tractor- Coffee Harvester in Function of Adequacy Tractor Ballasting

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