| Author | Astu Unadi |
| Call Number | AIT Thesis no. AE-90-10 |
| Subject(s) | Drill (Agricultural implement)
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A seven-row seed cum fertilizer drill with working width of
1.75 m to match a two-wheel tractor was developed from the 8-row
AIT direct paddy seeder which had some operational and mechanical
problems. The improvement was done in many components of the
original machine. A fertilizer applicator which can place
fertilizer in the soil was added to this machine to increase it's
capability.
For each row of seed , there is a seed hopper, a 6 fluted
seed metering roller and a double disc furrow opener and for each
row of fertilizer there is a fertilizer hopper, a fertilizer
agitator and hoe type fertilizer furrow opener. Fertilizer furrow
opener frame is fixed to the seed furrow opener frame to place
fertilizer 2 cm below seed level and 5 cm beside the seed.
Two lugged driving wheels rotate metering rollers and
fertilizer agitators mounted over a common shaft. Each flute in a
metering roller can pick-up 3 to 6 seeds with the seed rate of
25.8 kg/ha for paddy and adjustable for soybean and place them at
desired depth 3 to 7 cm. Fertilizer discharge can be adjusted
from 5 kg /ha to 130 kg/ha. The machine is provided with a foot
operated clutch to disengage seed metering mechanism and
fertilizer agitator, and a sun-shade to protect the operator from
direct sun light.
The capacity of machine is about 0 . 3 ha/h at forward speed
0.7 m/sec and field efficiency 72.2%. Damage due to metering
mechanism is nil for dry paddy and about 0.6 % for soaked paddy
and soybean. Ratio of established plants to seeds sown was about
86 % for soaked paddy seeds and 79 % for dry paddy seeds.
The production cost of prototype is about Baht 13,300 and it
will meet break even point at about 4.2 ha/year compared to
broadcasting and 1.8 ha/year compared to hand transplanting. |
| Year | 1990 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Gupta, Chandra P. |
| Examination Committee(s) | Singh, Gajendra ;Nielsen, Jens Moller ;Gee-Clough, D. ;Salokhe, Vilas M
|
| Scholarship Donor(s) | F.A.O . |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |