Onion Harvester
The harvester is a set of two machines first for cutting the leaves of onion and then digging and picking them up without causing any damage to the bulbs.

While harvesting onion, separation of the leaf/stalk from the bulbs is a tedious task and involves a lot of manpower. If leaf/stalk is not removed properly the onion fetches less price. Also if the onion is picked up along with the leaves, separation of soil from the onion becomes a difficult job. In order to mechanize the process, Shrawan developed two machines; one for cutting leaves and another for digging, picking up and cleaning soil from the bulbs. Presently, he is trying to combine both the machines together as a unit i.e. as onion leaf cutter cum digger.

Initially for testing, he had developed motorcycle rear mounted leaf cutting device as well as onion digging device (2013). This was able to dig and pick onion along with soil and drop on the field. Having achieved success with the motorcycle, he implemented it in a tractor by developing tractor front mounted digging unit with conveying and collection unit (2013 - 2014).

The leaf cutting machine
This is an attachment to a motorcycle after removing its rear wheel and has two wheels each on the front and rear. Lifting (of leaves) and cutting mechanism have been incorporated on this attachment, powered by the motorcycle. The cutting width of the machine is 4.5 ft (1.3725 m) with the field capacity being 0.2 ha/h (=1.2 beegha/hour) at a speed between 1.5-2 kmph. This process of leaf cutting is followed by digging the bulbs using tractor operated machine.

Tractor operated onion digger
The tractor front mounted PTO operated machine consists of self-designed frame for supporting power transmission system from tractor PTO and cutting blade and conveyor mechanism. The dug onion along with soil travels on the conveyor along the length of tractor where the soil gets separated due to gap between the slats. The gap is optimized according to normal size of onion. The onion bulbs get collected without damage in the collector box mounted at the rear of the tractor, which needs to be emptied periodically. The cutting width of the digger is 670 inch (1.778 m) and cutting depth is up to 3 inch (0.076 m) at a speed between 1-1.5 kmph. The machine requires a 50 hp tractor along with which, its field capacity is 0.166 ha/h (1 beegha/h) consuming 2 litre per hour fuel. It is to be noted here that 40 labours are required to do the same job in one day and at Rs 300 per labour.

Shrawan also developed different versions of weeders. Initially, he made a single tine manual weeder where used an old rim of the motorcycle and attached the hoeing and weeding attachments to it with a frame. The whole assembly needed to be pushed for hoeing/weeding, which was cumbersome. In order to increase productivity and reduce the efforts required, he developed a tool bar, which could be attached to a motorcycle by removing the rear wheel and got power from its engine. The weeder is claimed to cover 2.5-3 beegha/h with the attachment cost being Rs 55,000/-. Later he further modified the motorcycle operated weeder into an engine operated weeder.

Shrawan then developed a motorcycle operated salt farming unit. Earlier, while undertaking well digging work he used to visit salt farming areas and see the manual operation of turning saline water used for making salt. The task is very tedious as the worker needs to stand in saline water, which results in skin irritation/ infection. After noticing that motorcycle based weeder, one his relative also reminded him about the problem of the salt farmers, which he himself had seen. He worked on his weeder and modified the weeding attachment to enable it to turn the saline water during salt farming (2013). He claims that machine can do the job of six persons. For covering a plot of 100x100ft it needs only 100 ml of petrol, hence the operational expenses are also less.

Presently, Shrawan is trying to develop a simple device to open tire nuts from vehicles and an onion transplanting device.