Modification and performance evaluation of a knapsack sprayer with horizontal and vertical boom adjustment
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Date
2024
Authors
Iris Jewel B. Castañeto
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Abstract
This study focuses on the modification and performance evaluation of a knapsack boom sprayer enhanced with control and sensor systems to optimize agricultural chemical application. The fabrication included the construction of the support frame, boom frame, and height adjustment system. The machine was also integrated with sensors such as an ultrasonic sensor for measuring water level and the distance between the crop tip and the nozzle. Additionally, a water pressure sensor was used to monitor the sprayer's pressure. The distance between the crop and the nozzle, water level, pressure and solenoid were controlled using a web app connected to a microcontroller.
Performance evaluations were conducted to assess spray coverage, droplet size, volume mean diameter (VMD), and field efficiency for both horizontal and vertical spraying. Results indicated that the top and middle areas achieved high and consistent spray coverage, with the top area reaching approximately 94.10% for horizontal spraying and 94.52% for vertical spraying. The bottom area, exhibited significantly lower coverage, averaging 21.72%, suggesting a need for further optimization. Droplet size analysis showed uniform distribution across different levels, essential for effective application. Field efficiency was calculated at 65.85%, reflecting real-world operational conditions such as operator fatigue and terrain irregularities. the total cost for fabricating the modified sprayer is Php 12,246.00 The total operating cost per hectare was found to be Php 488.45.