Dear Mr .uvaispulisseri
Good the above info will and can guide you Thru the initial stage , i am no expert nor a consultant or even will ever try to sell you any services or products,
So my friend , i am only sharing my very little experience in Malaysia and Australia , Please check with more experienced dairy industry farmers,not consultants.
since you only going to have 20 heads , you will need some where around average 20 acres of fodder planting area (Max)
and i suggest you plant at least 7 acres of Napier .(this huge sized sugar cane like grass is perfect for dairy, for you to cut and feed it to cattle’s, nowadays there are tractor mounted cutter in India and this plants will last for like 15 years , you just have to cut every 25 day and it will continuously , take care of your feed need.and in the initial stage it might take 4 months to be in the cutting cycle.also my friend you will need a diesel engined grass chopper/ cutter ,
plant 3 acre of guinea grass ( this variety is great for grazing and exercise, you can buy the seeds, like 5kg will be OK for 3 acres, you also may cut and feed it to animals), based on my personal , plant this variety with a thick layer of river sand as base, as the grazing animal will have their hoofs rub-ed and you might not need to cut the hoofs,
and make like 3 paddocks out of this 3 acres , and allow this animal in a single paddoc for period like 2 weeks for each paddock, and after they have cleaned out a paddock then move them to another and rejuvenate the damaged one like ploughing and replanting, and so on.
the balance acreage ,you may plant Maize or any corn variety,
you might need the grains too and i have choped the corn stalks and feed it to the cattle too.
if you have good labours , then collect the corns and admixed it with the Napier grass and its perfect feed it the whole animals.
5) NUTRIENTS NEED :
don’t buy any chemical fertilizer for the whole planting exercise.(trust me)
get your self chicken dung (a 300 tonne , if possible )
spread it evenly onto the entire land area, and get a tractor to plough it into the soil,leave it for like 10 days , after a few rain start planting, that’s it ,
chicken dug have like 10% in weight of needed calcium for the dairy animals,it also have all the needed NPK,Mg, and all the other micro nutrients too,
you only need to redo this once every 10 months or so.
HYDROPONICS : means WATER - WORKS (thats all, harnessing water and its works to our benefit,dont get too carried away into this subjects,i think i know , what is your requirement, lets see if i understand you ,follow this guide and your watering problem will be over,)
now to answer the main question, in your case ,
i think you are worried about irrigating the fodder , right ?
in your case , you dont have to admix the soluble fertilizer with water and irrigate it , like the micro drip irrigation, this is very bad for the animal too , the soluble fert is economical and also dont spray it too , it contains Molydenum , which can harm your milk producing cattle too,
the napier grass / corn will need to be watered almost daily , so if its not raining for a week or so , please use tall sprinklers and use a pump to give water , thats all , the fertrlizer is already in the ground, just water it. the cheapest sprinkler will have at least 6 meter radius fit at 6 meter rows , and have a control valve in each row, (best poly pipe) if the preasure is not enough, shut down a few row and later play by taking turns ,thats all,one pump set is ok , for the whole area,
the smaller grass , you can irrigate ,with short sprinklers, use the same pumpset too,you will need to learn a little of how poly pipe work , its easy a few day of learning will make you do it yourself,
no need for you to buy any micro tubes / drip irrigations, its only good for edible plants,
Best of luck mate, its not rocket science, just do it .
Ramprakash L Chandra