First things first… you have to make sure you will collect the maximum rainwater that falls in your 20 acres… the easiest way would be to make paddy field like square bunds so that max rain water will soaking every day. If you can create a 10mtr long 4 feet deep pool you can use it for harvesting rain to ground water and also breed fish.
Initial months must be used to rejuvenate soil health… this is an impossible task without indigenous cattle… once there are enough earthworms then nature will take its own course of water harvesting and making the earth porous…
I suggest start small if you are a newbie… large investments have larger risk… Risk should be taken in business… but the Risk should be “Calculated-Risk”… never take more than what you can bare…
Hi-tech farming with greenhouse is not required in India… especially in areas above 30decree Centigrade… as heat and sunlight are needed… for the plants to grow and are available in plenty… creating “rainshelter” kind of polyhouse is sufficient to avoid rain and fertilizer spray from above… and once this is up you can cultivate 12 months of the year… you could plan the rainshelter next year after your first trial run…
If you are thinking of 5 acre single crop too is possible… very risky… but possible… but your soil health should be excellent for that… disease happens in our bodies due to some weakness of “good bacteria” in our body and they get overpowered by the bad-bacteria invading the body… similarly for the soil too… if the good bacteria in the land is less it could be overpowered by the bad-bacteria… and plant disease could occur if this happens then the risk is very high… “NEVER PUT ALL YOUR EGGS IN ONE BASKET” is an investment slogan…
If it is a monocrop the disease would take down a lot of the crop… some times the entire lot… in a multicrop of say 5 crops only 1 or 2 would be affected and you could harvest the 4 or 3. Which means you would be able to sell something rather than nothing. Also different types of crops have different properties… some plants like to breath out oxygen more number of hours than the rest… the behavior of the roots system is different… enrichment and consumption of each plant to the soil is different… Every plant gives as much it takes from the Earth. The benefits of multicrop far outnumber the monocrop.
It has been clinically proved that the good bacteria in desi cowdung is many times more than jersey cow… so much so that you can mix desi cowdung with jersey cowdung and generate the same amount of bacteria just like one curd put in milk can create further curd. Desi cow AND OX can even pull the plough…
Tractor use is to be lessened to lower expense as a general rule… especially on small farms where oxen can be used. But if you need to do 20 acres you will need to use Tractor…
Vermiculture and Earthworm-culture are as different as chalk and cheese. The worms used in each is very different although both are called Earthworms.
Vermiculture is inferior “technology”… the vermi-worms do not pierce the ground or burrow… they lie inside “bin” and have no contact with the soil. Any transfer of the output has to be manually done. Serves single purpose - 1) Create Fertiliser.
While Earth-worms burrow the soil… they multiply real quick and spread all across the field… on one acre can have 100,000 earthworms which will double every year and create tunnels in the ground for the rain water to sink into… to sustain this earthworms you just have to send through irrigation pipe the slurry from biodigester which would require very less manhours… Earthworm Culture is automatic… its nature… nobody has to do anything… just dont put chemicals in the farm to kill the worms…
Has multiple functions 1) Create fertilizer, 2)Move earth 3) Create Water harvesting channels
You will also have to create your own social media Page - One in Facebook for Pics & one in Youtube for videos is a must for marketing and sharing farm stories, events and also for guiding other. You will be competing directly against Global Giants like Monsanto and Bill Gates…
Once the farm takes shape… you can start incorporating open poultry farms (without cages) local Hens, Ducks and also diary…
Best of luck… and please share pics and updates…