Optimization of design and operational parameters of a soil-dispensing machine for preparing seedling tray
Hafidha Azmon1, Mohd Fazly Mail2, Mohd Shukry Hassan Basri3, Norahshekin Abdul Rahman4, Siti Ashah Ab Rahim5.
The conventional method of soil filling into nursery trays before seeding is known
to be the most inexpensive approach prior to planting vegetables. However, this activity is
very labourious and time-consuming if the operation is meant for high volume seeding. This
study is done to develop soil-dispensing machine, evaluate its performance and to compare
with traditional practice of soil filling into the nursery tray. The optimization of each
parameter is also evaluated to obtain the exact volume of soil to fill the nursery tray to the
fullest. A low-cost soil dispensing machine is developed in MARDI and it is using locally
materials available in the market. The structure of the machine is fabricated using mild-steel
and stainless-steel at the less cost. The machine consists of a conveyor, nursery tray holder,
soil dispenser, scrapper, soil compactor, wiper motors, gears, microcontroller and sensors.
There are three factors with two levels involve in this test; hopper angle, conveyor speed and
auger speed. The hopper angles are evaluated at 45° and 65° while conveyor speeds are tested
at 19 cm/s and 21 cm/s. The minimum and maximum speed of auger selected is 3.5 cm/s and
4.5 cm/s, respectively. Manual filling of soil into seedling tray was compared with filling soil
using semi-automatic operated soil-dispenser. The results indicated that the model is
significant with p-value <0.0001. Conveyor speed, auger speed and hopper angle were
significant on the volume of soil dispensed with both speeds shows a p-value <0.0001, while
hopper angle shows p-value equal to 0.00112. The combination of both speeds greatly
affected the response with p-value <0.0001. There is no interaction between each speed and
the hopper angle. From the optimization analysis, the operating conveyor speed, auger speed
and angle of hopper should be set at 19.0 cm/s, 4.5 cm/s and 65° to discharge 2912 cm3 soil.
In order to dispense 1190 cm3 of soil, conveyor speed, auger speed and hopper angle should
be set at 21 cm/s, 4.3 cm/s and 50°. The result indicated that the machine can complete the
seeding and soil filling process within 1 min per tray, while manual process took five minutes
to complete the whole seeding process.
Affiliation:
- Malaysian Agricultural Research and Development Institute (MARDI), Malaysia
- Malaysian Agricultural Research and Development Institute (MARDI), Malaysia
- Malaysian Agricultural Research and Development Institute (MARDI), Malaysia
- Malaysian Agricultural Research and Development Institute (MARDI), Malaysia
- Malaysian Agricultural Research and Development Institute (MARDI), Malaysia
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