BIOA02H3 Lecture Notes - Lecture 11: Loam, Biogenic Substance, Root Hair

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25 Apr 2018
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BIOA02H3 Full Course Notes
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Essential nutrients: abs = plant x complete life cycle e. g. x grow up/germinate/ pdc flower/pdc seed. Macronutrient - required in relatively large amt e. g. n, k, ca, mg, p, s, si. Micronutrient - required in relatively small amt e. g. cl, fe, b, mn, na, zn, cu, N: essential building blk for life & basic metabolism & photosynthesis; atmospheric overabundance (78%); pdc by bacteria; young soil (e. g. sand dunes, newly desiccated areas, volcanic islands) - n ltd until bacteria build up. N lv; e. g. aa/proteins, chlorophyll, atp, nadp, dna 4 nucleic acid bases. > same as above) or consumption by animals -> excretion -> uric acid & urea - P: promotes early plant growth & root formation -> role in cell division; essential for flowering & fruiting (large & juicy) ; low availability @ soil cuz highly reactive -> precipitated -> bio-unavailable; e. g. dna sugar backbone, Atp, nadp more bio-accessible through volcanic eruptions & grinding action of glaciers.

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