Pusa bin is developed by the Indian Agricultural Research Institute (I.A.R.I.), New Delhi and It is a modification of the ordinary mud storage structure commonly used in villages. Pusa bin has been demonstrated in some African countries and it gives good results when loaded with well dried grain.
Pusa bin has a foundation of bricks or compacted earth. A sheet of 700 gauge plastic is laid on this platform, ensuring that it overlaps the platform on all four sides by at least 6 cm to provide moisture proof and airtight conditions. A layer of 7 cm thick mud bricks is then laid on the plastic sheet.
The walls are constructed to proper height (usually 1.5 to 2 meters) and frame of wooden is placed on it. Walls of this structure are made of mud bricks and these are sealed with mud plaster. The roof part is made of burnt bricks.
An inclined steel or wooden pipe is fitted at base for unloading of grain by gravity. All four walls and roof are covered from inside with a plastic sheet.
On top of bin, an open space of about 50 cm x 50 cm is left for grain loading. Mud plaster is then applied to roof leaving open space. Top open space (50 cm x 50 cm) is well covered by plastic sheet to avoid air entry after the bin is filled with grains.
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