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Core Training Feb 9th In-Service

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1 Core Training Feb 9th In-Service
N-Cycle Core Training Feb 9th In-Service

2 N-Cycle OM 2 OM Processes 2 N Processes 3 Sinks 4 losses 5 additions

3 Organic Matter Central point of the Nitrogen Cycle
In an acre furrow slice 1000 lbs N per 1% OM A continuous flow of N into and out of OM.


5 Organic Matter Processes
Immobilization NO3 and NH4 tied up into OM Mineralization OM decomposed into NO3 and NH4 High Carbon (straw)= Immobilization Low Nitrogen (alfalfa) = Mineralization


7 Nitrogen Processes Amminization and Ammonification Nitrification
OM converted to NH4 Nitrification NH4 converter to NO3 Ammonium + charge and Immobile Nitrate – charge and mobile


9 Nitrogen Sinks Large Amounts of Nitrogen located in these pools.
Atmosphere : 78% N in the form of the diatomic gas N2 Nitrate Pool Microbial Sink


11 4 Losses Leaching Ammonia Volatilization Denitrification Plant Loss
NO3 – follows water flow. Ammonia Volatilization NH4 at a pH >7 H is stripped off and NH3 (gas) formed. Denitrification NO3 in waterlogged soil. Microbes strip O off Plant Loss NO3 and NH4 converted to NH3 in plant, in stress NH3 gassed off.


13 pH and Temp are Drivers

14 Additions Lightning and Rainfall Biological N Fixation Decomposition
Industrial Fixation Fertilization


16 Remember Organic Matter
Organic Matter is the Driver Annual N need is determined by Mineralization and Immobilization Environment, temp and rainfall, drives Mineralization and Immobilization

17 Applications within The N-Cycle
Understanding Inhibitors Urease and Nitrification Fields had High N in October and N deficient by Dec.

18 Definitions Organic-N: N that is bound in organic material in the form of amino acids and proteins. Mineral-N: N that is not bound in organic material, examples are ammonium and nitrate-N Ammonia: A gaseous form of N (NH3). Ammonium: A positively charged ion of N (NH4+). Diatomical-N: N in the atmosphere (N2) Nitrate-N: A negatively charged ion of N (NO3-). Mineralization : The release of N in the inorganic form (ammonia) from organic bound N. As organic matter is decayed ammonia quickly reacts with soil water to form ammonium, thus the first measurable product of mineralization is usually ammonium-N. Immobilization: Assimilation of inorganic N (NH4+and NO3- ) by microorganisms. Nitrification: Oxidation of ammonium N to nitrate N by autotrophic microorganisms in an aerobic environment. Denitrification: Reduction of nitrate N to nitrous oxide (N2O) or diatomical N gases by heterotrophic microorganisms in an anaerobic environment. Autotrophic: A broad class of microorganisms that obtains its energy from the oxidation of inorganic compounds (or sunlight) and carbon from carbon dioxide. Heterotrophic: A broad class of microorganisms that obtains its energy and carbon from preformed organic nutrients. Volatilization: Loss of gaseous N from soil, usually after N has been transformed from ionic or non-gaseous chemical forms.

19 Thank you!!! Brian Arnall 373 Ag Hall
Brian Arnall 373 Ag Hall Presentation YouTube Channel: OSUNPK

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