A system as defined in claim 6, wherein said cooling device includes a heat exchanger in contact with said volatile liquid fertilizer exiting said fertilizer reservoir, said heat exchanger receiving and vaporizing a portion of said volatile liquid fertilizer for cooling the remainder of said volatile liquid fertilizer entering said distribution manifold.Ĩ. A system as defined in claim 1, further comprising a cooling device for cooling said volatile liquid fertilizer exiting said fertilizer reservoir.ħ. A system as defined in claim 1, wherein said controller is configured to control said constant pressure flow rate control devices independently for selectively varying the flow rate of said volatile liquid fertilizer between each of said dispensing tubes.Ħ. A system as defined in claim 3, wherein said duty cycle of each of said constant pressure flow rate control devices is determined and controlled by said controller.ĥ. A system as defined in claim 1, wherein each of said constant pressure flow rate control devices comprises a valve that pulsates between open and closed positions according to a duty cycle.Ĥ. A system as defined in claim 1, further comprising a pressure control device for controlling the pressure at which said volatile liquid fertilizer is dispensed from said fertilizer reservoir.ģ. A system for maintaining a volatile liquid fertilizer in a liquid form while dispensing controlled amounts of the volatile liquid fertilizer into a soil, said system comprising:Ī fertilizer reservoir for holding a volatile liquid fertilizer under pressure sufficient to maintain at least a portion of said fertilizer in a liquid form, said fertilizer reservoir including an outlet for dispensing said liquid fertilizer Ī distribution manifold in communication with said outlet of said fertilizer reservoir, said distribution manifold being connected to a plurality of dispensing tubes designed to inject said volatile liquid fertilizer into the soil Īt least one flow meter for monitoring the flow rate of said volatile liquid fertilizer Ī plurality of constant pressure flow rate control devices, each of said flow rate control devices being in communication with and placed on a corresponding dispensing tube, said constant pressure flow rate control devices controlling the flow rate at which said volatile liquid fertilizer is dispensed from said dispensing tubes while preventing said volatile liquid fertilizer from vaporizing within said distribution manifold andĪ controller in communication with said at least one flow meter and said constant pressure flow rate control devices, said controller receiving flow rate information from said at least one flow meter and, based on said information, adjusting said constant pressure flow rate control devices for dispensing said volatile liquid fertilizer at a selected flow rate while maintaining said volatile liquid fertilizer at a pressure within said distribution manifold sufficient to maintain said volatile liquid fertilizer in a liquid form.Ģ. 15, 1995, entitled "Independent Flow Rate and Droplet Size Control System and Method for Spraying".ġ. Comino, SAE Technical Paper Series, "Variable Flow Control for Pressure Atomization Nozzles", pp. 77-83, 1995, Silsoe Research Institute, California.ĭurham K. French, Intermittent Control of Liquid Flow from Fan Nozzles in Concurrent Air Streams: Wind Tunnel Studies of Droplet Size Effects, J. 101-112, 1992, Silsoe Research Institute, California.ĭ.K. Ben-Salem, "Spray Droplet Velocity and Energy in Intermittent Flow from Hydraulic Nozzles", J. Comino, "Droplet Size and Spray Pattern Characteristics of An Electronic Flow Controller For Spray Nozzles", J. MID-TECH.TM.-Complete Anhydrous Ammonia Control, p. The Next Generation of Ag Spraying Technology", Aug.
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