questions: asking about fish feed and inorganic fertilizer dose 
 answers: suggested to use rice bran and ssp @ 1:1 ratio
for 4000 fish of 150 gram 10 kg feed is required. before using this much amount of feed please use only 6 kg per day for few days and as per the fish feed requirement increase the feed. you can go for making ball of the feed and put in a gunny bag and tied it around a bamboo driven into the pond
urea @ 3.5 kg per bigha for 1 month and ssp @ 2.7 kg per bigha for 1 month. 
cow dung is 130 kg foe 1 bigha for 1 month and mix with suitable amount of water and broadcast it on the water surface.