Modelos estatísticos para seleção de dosadores helicoidais com diferentes dispositivos de descarga de fertilizante

Abstract

R E S U M OO presente trabalho teve por objetivo desenvolver uma ferramenta capaz de expressar matematicamente a taxa de aplicação de fertilizante em função do tipo de dosador, inclinação longitudinal, inclinação transversal e velocidade de acionamento do dosador. Foram utilizados três dosadores helicoidais com dispositivos de descarga por gravidade, transbordo transversal e transbordo lateral e adotado o delineamento composto central rotacional, com três variáveis independentes. A partir dos modelos ajustados constatou-se que os dispositivos de descarga apresentam diferentes implicações em relação aos efeitos de inclinações longitudinais e transversais de operação. O dosador com descarga por gravidade demonstrou maior sensibilidade quanto aos efeitos das inclinações de operação e o dosador com descarga por transbordo lateral demonstrou menor sensibilidade. A análise de regressão demonstrou que todos os modelos foram significativos, sendo encontrados baixos erros relativos e absolutos dos dados previstos pelos modelos.Mathematical models for selection of helical fertilizer metering mechanism with different fertilizer discharge A B S T R A C TThis study aimed to develop a tool capable of expressing mathematically the rate of fertilizer application depending on the type of distributor, longitudinal slope, cross slope and driving speed of distributor. Three helical distributors with gravity discharge, transverse discharge through overflow and side discharge through overflow were used. The central composite rotational design with three independent variables was adopted. From the adjusted models it was found that the discharge devices have different implications for the effects of longitudinal and transversal slopes of operation. The distributor with gravity discharge showed greater sensitivity to the effects of slopes and the distributor side discharge through overflow showed lower sensitivity. Regression analysis showed that all models were significant, and found low relative and absolute errors of the data predicted by the models. Palavras-chave:semeadora adubadora taxa de aplicação de fertilizantes mecanização agrícola

Performance of Fertilizer Metering Mechanisms of Planters as a Function of Longitudinal Inclination

“…The horizontal toothed rotor presented the third lowest variation and the helical metering without flow restrictor presented the highest variation. These results corroborate with the studies presented by Franck et al (2015).…”

“…Studying statistical models for selecting helical metering mechanisms with fertilizer discharge devices, Franck et al (2015) stated that the discharge meter without flow restrictor showed a greater sensitivity regarding the effects of operating inclinations whereas the discharge meter by lateral overflow showed a lower sensitivity.…”

Performance of Helical Metering Mechanisms in the Application of Microgranular Fertilizer

“…Equations 2and 4, which represent the behavior of the helical metering mechanism by longitudinal (M1) and lateral overflow (M3), respectively, showed similar variations relative to the inclination. Similar behavior was observed by Ferreira et al (2010), Franck et al (2015), and Garcia et al (2017), who reported that metering mechanisms with longitudinal or lateral overflows when subjected to positive (acclivity) and negative (declivity) longitudinal inclinations cause increases and decreases, respectively, in the application rate.…”

Mechanized fertilization: individual application of nitrogen, phosphorus and potassium in sugarcane

“…These authors emphasized how significant and relevant the use of the SPC was in the soil preparation, facilitating the tracking of the operational quality. Franck et al (2015) analyzed the distribution of fertilizers through the activation speed and leaning of the dispenser, proving how the declivity of the terrain influences the rate of application of the nutrients in a different way per the analyzed dispenser. They also reported that the auger -gravity discharge showed more vulnerability regarding the transversal and longitudinal inclinations, resulting in low precision in the distribution of the fertilizers, while the helical mechanism -transverse discharge through overflow obtained a better distribution of fertilizers.…”