Assuming 1 gallon of 10-40-0 liquid fertilizer weighs approximately 11.5 lbs, then it would contain 1.15 lbs of Nitrogen (10%), 4.6 lbs of Phosphorus (40%) and 0 lbs of Potash.

It would take 7.66 lbs of a 12-61-0 water-soluble powdered fertilizer (4.6 lbs divided by 0.61) to provide an equivalent amount of Phosphorus; which would also yield .92 lbs of Nitrogen (7.66 x .12)


Kelly Duffie
Cypress, TX