Abstract
The work aimed to study the behavior of a prototype planted simultaneously three times with solid fertilizers, nitrogen, phosphorus and potassium, of variable rates and desired quantities. For the evaluation of the prototype, a test bench was built where helical doses and their respective direct current electric motors; three tanks for storage of fertilizers were used. Also used were: A source (12 V-DC), three power drivers (MOSFET), acquisition board and control software. The tests were performed with LabVIEW®8.6 to control the rotation of the axes, record data in maps of soil fertility and geographical location. The results showed that application values showed an error of 3:56% at the rate of 45 kg/ha and an error of 1.78% at the rate of 85 kg/ha. However, the slightest mistake was on rotation of 26 to 30 rpm because the ratio flow rates had error <1%. Therefore, the dosing speed became maximum of 35 rpm; making the variation of the theoretical flow rate from 2.6 to 93.7 kg/ha. But with low flow rate, the error was 8.3% to 4 rpm on products of 9.79 kg/ha. Key words: Data acquisition board, flow rate, helical feeders, varying rates, power drivers.
Highlights
The use of fertilizers has over time been increasingly important for the evolution of cultures
The results showed that application values showed an error of 3:56% at the rate of 45 kg/ha and an error of 1.78% at the rate of 85 kg/ha
The values of mass flow rate determined by time were compared with the fertilizer mass values given in the application map
Summary
The use of fertilizers has over time been increasingly important for the evolution of cultures. Through research and experimental procedures, this practice has been associated with soil needs. Tools and devices have been used that control systems of manure deposition according to the nearest ideal needs of plants. The term precision agriculture is used to describe the use of several advanced technology to reduce costs of production and preserve the environment (Blackmore et al, 2007). Precision agriculture can be divided into three major steps: collecting of data, mapping of spatial and temporal variability of the field; data analysis for decision making and localized application in agriculture. Precision agriculture involves using equipment with capacity to apply accurately inputs at variable rates. The application of fertilizers in variable rate aims to maximize their use and reduce the negative impacts of agriculture on the environment
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