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7 Cards in this Set
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- Back
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topsoil composition
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- inorganic components: anions (nitrate, phosphate), cations (Ca, K, Mg)
- organic components: humus (decomposing organic matter), organisms |
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macronutrients in plants
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- needed in large quantities
- carbon - oxygen - hydrogen - nitrogen - potassium - calcium |
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symbiotic relationships
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- soil bacteria: decomposition of organic matter, helps in the acquisition of nitrogen
- fungi: decomposition, mycorrhizae. |
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nitrogen nutrition in plants and soil bacteria
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- N- fixing: capture N from atmosphere. convert it to ammonia (NH3)
- ammonifying: get ammonia from decomposing matter. - nitrifying: reduces ammonium to nitrate. - denitrifying: too much ammonia. recycle nitrogen back to atmosphere. |
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rhizobium
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- nodules carry rhizobium.
- attract bacteria to root hair. - bacteroids form in dividing cells, - root nodule forms. - swells in vasculature. |
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ectomycorrhizae
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- on the surface of the root. mantle (sheath)
- hyphae go between cells to endodermis |
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endomycorrhizae
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- penetrating hyphae into the cell. form fungal vessicles.
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