Patent ID: 9439345
Filing Date: 2016-09-13
CPC Classification: A01C,C05B,C05G

Claim Text:
1. A method of simultaneous micro-irrigation and phosphate fertilization of agricultural soil with irrigation water having a pre-additive precipitation factor of from 125 to 1,000 ppm, wherein said precipitation factor is a combined level of total alkalinity (as CaCO 3 ) in ppm and total hardness (as CaCO 3 ) in ppm, without plugging of a micro-irrigation system, comprising the steps of: (step 1) adding a phosphate fertilizer to said irrigation water at a level of 40 to 2,100 ppm fertilizer phosphate (as P2O5) as a chaser to an addition of a combination of a water-soluble organic acid selected from the group consisting of formic acid and the ammonium, potassium and sodium salts thereof, and a water-soluble organophosphonate selected from the group consisting of compounds of Formulas I and II, wherein x is either zero or one and wherein each M is a water-soluble cation independently selected from the group consisting of hydrogen, ammonium, potassium and sodium, to said irrigation water, said combination of said organic acid and said organophosphonate comprising a dosage of said organic acid of wherein ac.dos is the dosage of said water-soluble organic acid and pf is said precipitation factor of said irrigation water, and a dosage of said organophosphonate of wherein op.dos is the dosage of said organophosphonate and pf is said precipitation factor of said irrigation water; (step 2) then feeding said irrigation water through said micro-irrigation system; and (step 3) then allowing said micro-irrigation system to deliver said irrigation water to said agricultural soil.