Where did you get this 2200kg and 800kg per acre? And please stick to Hectare and avoid acre to keep it simple. All the world and global agricultural institutions like FAO uses Hectare, ton, kg, meter to publish their data. Only United States is still stuck with traditional Acre, feet, bushel kind of measurement.Japnese yield is 2,200 kg per acre. What is the yield in BD? It is about 800kg for each harvest. BD soil is not that fertile.
It seems, you calculated this 2200 kg and 800 kg figure from 6.3 ton and 4.8 ton yield of paddy respectively in Japan and Bangladesh I mentioned earlier and divided that into 3 to get the yield per acre ! although 1 hectare =2.47 acres. More over you again divided Bangladesh's yield into 2 to accommodate two crop in a year to reach the 800 kg per acre in per harvest ! This is totally unconventional and riddled with mistakes.
First of all, FAOSTAT from which I quoted the data already taken into account of Bangladesh's multiple paddy harvest in a same plot of land to find Bangladesh's yield of 4.8 ton per hectare.There are terms like gross cultivated area and net cultivated area used by agricultural institution to separate the single cropped land and multiple cropped land.
Gross cultivated land means, land area required to produce one harvest per year even in cases where the land produce multiple crops while net cultivated land means amount of actual land produced multiple harvests in a same plot.
Suppose, a farmer get 5 tons of paddy per harvest from his 1 hectare of land twice in a year. In this case, his net cultivated land would be 1 hectare but gross cultivated land would be 2 hectare and the yield would be 5 tons and total paddy 10 tons.
According to FAO data, in 2019, Bangladesh harvested 54.5 million ton paddy (not rice, 1000 kg paddy usually gives 600-650 kg milled rice) from 11.5 million hectares land, yield 4739 kg per hectare. While Japan got 10.5 million ton paddy from 1.5 million hectares land, yield 6826 kg per hectare. See the data here-
Now do you think, Bangladesh actually produce paddy on 11.5 million hectares? when it's total net cultivated land is no more than 8 million hectares? Of course not. This 11.5 million figure is gross cultivated paddy land where land is counted twice if it gives 2 paddy crops a year, counted thrice if it gives three paddy crops per year. This is how it got 11.5 million hectares in case of Bangladesh.
Our real net cultivated land dedicated to paddy cultivation is no more than 6 million hectares. But this 6 million hectares actual land give us paddy equivalent of 11.5 million hectares due to multiple cropping. The 4.8 ton per hectare paddy for Bangladesh is thus from gross cultivated hectare, not from net cultivated hectare. Our net cultivated yield from each hectare would be around 9 ton per hectare, above Japan's 6.8 ton per hectare. I hope it got clear to you now.
I don't understand your this obsession of 'proving' Bangladesh's land is not fertile.BD soil is not that fertile. It produces this much because of the use of chemical fertilizer in huge quantities.
And chemical fertilizer uses in land is comparable in both Bangladesh and Japan. Bangladesh apply on average 289kg fertilizer on each hectare of land while Japan uses 242 kg per hectare. By world standard both of these figure are medium. China apply 503 kg fertilizer in each hectare of land.
Fertilizer consumption (kilograms per hectare of arable land) from The World Bank: Data
Contrary to your claim here, Bangladesh actually still not utilizing it's true potential of quality land it got. It's land is heavily fragmented, farmers are uneducated or poorly educated about scientific cultivation, minimal application of modern equipment, lack of irrigation infrastructure. Solve these problems like Japan, our yield will increase even farther.