8 - Nitrogen and Other Nutrients in Agroecosystems

8 - Nitrogen and Other Nutrients in Agroecosystems -...

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Nitrogen and other Nutrients in Agroecosystems
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Nitrogen in Ecosystems Nitrogen: Essential for plant and animal growth. Animals gain N by consumption. Plants generally obtain N by root uptake. Available N tends to be in short supply in ecosystems ( therefore competition for N ). Abundant supply of N in air, but available N pool is in soil.
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N Supply Critical for Plants
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Forms of N in Soil Organic N (originated from living organisms) Inorganic N – NH 4 + ammonium – NO 2 - nitrite NO 3 - nitrate N 2 gas Etc. N 2 O Water soluble for uptake by plant roots
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Immobilization Problem Organic (immobilized) N = not soluble in water so not available to plant roots Inorganic N in ion form is water soluble and available to plant roots.
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Immobilization Problem Plants pick up N via water in roots. • So inorganic N (NH 4 , NO 2 and NO 3 ) forms are soluble and can be easily taken up. Mineralization (through decomposition) converts immobilized N to available N. mineralization organic N inorganic N (not available) (available)
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Immobilization Problem Many organisms (plants, bacteria, fungi)
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8 - Nitrogen and Other Nutrients in Agroecosystems -...

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