Is a machine that harvests grains crops, combining three separate operations like reaping, threshing & winnowing into a single process. The straw left behind on the field can be used as a mulch or bailed for feed and bedding for live stock.
Tractor mounted on the top of the machine having a wide cutter bar moving on tractor tyres are called as wheel type / tractor driven / tractor mounted combine harvesters. Standard weight of the machine will be 3,850 kgs + tractor engine weight 3,000 kgs + grain weight 700 kgs, total weight around 8,000 kgs ( 8 tons ). It is much more than a weight of huge African elephant. It can be operated only on dry fields, can harvest one acre of paddy field in 30-90 mins, charges are 1,400 rupees per hour and the machine cost around 16 lakhs. All its weight falls on its 16 inches tyres, soil gets compacted and hardened like our tar roads when we moved on our fields. It is so close to road rollers moving while making the roads.
Track type combine harvesters have a inbuilt engine, uniform weight distribution of 3,500 kgs to 5,500 kgs (depending on the companies) on 6 feet length x 1 1/2 width rubber tracks made easy to move even on wet paddy fields. They take 40-180 mins to harvest one acre of paddy field, 2,400 rupees per hour and machine costs around 20-25 lakhs.
Combine harvester companies says these are the most economically important labor saving invention, cheap, easy & time saving.
But, the problem is we need to collect the straw from the field, grains are to be taken to drying yard to remove excess moisture in the sunlight to store, need to wait for more than 8 months to dry further in the gunny bags for milling process to get raw rice. Again we have to dry one more time to get below 10% moisture of paddy before milling process. These are all the indirect disadvantages that we need to look for.
Due to abrupt stoppage of seasoning the grains with these combines, we will loose 5% of yield from unmature grains + 10% of waste on the ground in this operation. Finally we have to compromise with keeping, cooking, texture, taste, aroma & yield of rice.
In 1999 am the first person to introduce these combines in our area, after realizing the fact, this year we harvested manually in 6 acres i.e. 1/3 of my paddy growing area. Next year am planning to harvest manually and say goodbye to combines.
Tractor driven combine harvester
Kubota track type harvester – Japanese technology weighs around 3,350 kgs with grain full tank
Reel & cutter bar in action, Track type combine harvester
Grains storing at tank
Unloading to the tractor, it can rotate 360 degrees