lecture 29 Nitrogen

lecture 29 Nitrogen - 1 Nitrogen Nitrogen The most limiting...

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Unformatted text preview: 1 Nitrogen Nitrogen The most limiting essential element in the environment Nitrogen and Soil Nitrogen and Soil Surface soil range: 0.02 to 0.5% 0.15% is representative 1 hectare = 3.3 Mg Atmosphere = 300,000 Mg as N 2 Biological/Plant Nitrogen Biological/Plant Nitrogen Amino acids Proteins Enzymes Nucleic acids (DNA) Chlorophyll Component of living systems Strongly limiting in the Environment 2 Deficiency Deficiency Chlorosis pale, yellow-green appearance primarily in older tissues. Excess Excess Enhanced vegetative growth lodging Over production of foliage high in N Delayed maturity Degraded fruit quality Distribution/Cycling Distribution/Cycling Atmosphere Soil / soil O.M. Plants, animals N 2 , NO, N 2 O NH 4 + , NO 3- , R NH 2 Proteins, amino acids Organic Nitrogen (plant tissue, Soil Organic Matter): R NH 2 During organic decomposition, R NH 2 is usually broken down to NH 4 + NH 4 + is converted to NO 3- by soil microorganisms 3 Mineralization: Decomposition of organic forms releasing nitrogen into the soil, generally as NH 4 + Immobilization: Plant uptake of mineral nitrogen, removing it from the soil and incorporating into plant...
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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lecture 29 Nitrogen - 1 Nitrogen Nitrogen The most limiting...

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