Patent ID: 8690984

Claim:
A method of prolonged-termed in situ fertilizer-manufacturing fertigation of an agricultural field, said agricultural field being irrigated by means of an active irrigation system having flowing irrigation water upstream of said agricultural field, said method comprising the steps of: (step 1) continuously charging a potassium-nutrient feedstock comprised of a plurality of co-reactant potassium-nutrient-feedstock raw materials to said active agricultural irrigation system by continuously charging said plurality of co-reactant potassium-nutrient-feedstock raw materials to a stream of said flowing irrigation water upstream of said agricultural field simultaneously and separately through a said plurality of feed points; wherein said plurality of co-reactant potassium-nutrient-feedstock raw materials comprises concentrated potassium hydroxide and a mineral acid selected from the group consisting of concentrated nitric acid, concentrated phosphoric acid, concentrated sulfuric acid, and combinations thereof, wherein said stream of flowing irrigation water has sufficient flow to intermix said plurality of co-reactant potassium-nutrient-feedstock raw materials with each other and said irrigation water, generating dissolution and reaction exotherms, wherein said stream of flowing irrigation water has sufficient flow to dampen said dissolution and reaction exotherms, whereby said irrigation water is converted to treated irrigation water; (step 2) irrigating said agricultural field with said treated irrigation water; and (step 3) repeating step 1 and step 2 each irrigation day over a prolonged period.