ADVANCEMENT OF ANHYDROUS AMMONIA APPLICATION 4/21/2010 Background Fertilizer use exploded after WWII
Plants built during the war to supply nitrogen for bombs; after war supplied ammonia for fertilizer Most of ammonia applied in 1940s was ammonium nitrate pellets, but this was highly explosive Research on anhydrous ammonia started in mid 1940s 1943 researchers at Mississippi Agricultural Experiment Station developed a way of injecting anhydrous into soil
Fertilizer Prices At local coop in Grant county UAN - $280/ton 28-0-0 $0.50/lb of N Anhydrous Ammonia $390/ton
82-0-0 $0.23/lb of N Problems with traditional application systems Do a good job of applying consistent amounts over a field, but not to each knife. Poor distribution of ammonia is more
evident in strip-till Problems with traditional application systems Anhydrous ammonia is a liquid under pressure A small percentage of ammonia vaporizes when pressure drops
Majority of mass in ammonia is in liquid while gaseous ammonia is a large part of the volume Up to 90% of space inside metering valve can be gas, making uniform distribution difficult Remedies to the problem Traditional systems Over-apply to compensate for rows with less ammonia
Application at an angle to planting rows Equal hose lengths between the manifold and knife Unused manifold ports should be plugged equally Upgrade to newer metering systems Advanced delivery systems
aNH3 Equaply System Maintains constant pressure of ammonia distributed to knives Allows for anhydrous ammonia to be distributed over a wide variation in tank pressure Flow control system is used to assure rate of application and to allow for variable rate application Liquimatic System No need for heat exchanger
Works almost like a steam trap Can handle higher rates aNH3 Equaply System aNH3 Equaply System Nurse Tank Requires a high flow globe valve at the nurse tank For high rates, dual tanks are recommended
Heat Exchanger Cools anhydrous ammonia below its boiling point and condenses vapor into liquid Pump increases pressure of liquid and lowers the boiling point aNH3 Equaply System Pump
Uses a Hypro centrifugal pump with a hydraulic motor Avoids surges like in a piston pump Pump keeps anhydrous ammonia at a liquid until it is split evenly at the manifold aNH3 Equaply System
Flow and Measurement Control Signals from flow sensor go to a cab console which operates the servo valve Can interface with AgLeader, Raven, and John Deere Greenstar II Also uses a gauge tree to monitor flow to individual rows aNH3 Equaply System Monitor and Gauge tree
aNH3 Equaply System Manifolds and Orifices From servo valve, anhydrous ammonia goes to one or more manifolds that are controlled by an electronic on/ off valve From these manifolds, EVA ammonia tubing runs to individual knives
Connecting lines also go to gauge tree Benefits of Equaply System Accurate control of anhydrous ammonia application Ability to achieve variable rates Decrease of streaking in fields
Can be used in no-till situations Liquimatic System Anhydrous Ammonia flows from tank to a Liquimatic tower Tower has a metal dam in it making
incoming vapor and liquid move upward When pressure from vapor reaches a certain point, a solenoid opens a valve and lets off liquid This also keeps a head pressure on liquid ammonia, ensuring it remains a liquid Liquimatic system Flow meter after the tower is metering only liquid which makes it much more accurate
Benefits of Liquimatic System Eliminates the need for a heat exchanger Allows for higher rates Can apply up to 80 gallons/minute 60 ft applicator can apply 250 lb/ac anhydrous at 12 mph Questions?
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