BIOA02H3 Lecture Notes - Lecture 11: Silt, Soil Fertility, Humus

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Ivana Stehlik

Document Summary

Bioa02h3 lecture 11: plant nutrition and soils. Plant nutrition and soils: nutrients necessary for plant life, nutrient availability in soils. Soil ph: nutrient uptake by plants, biotic helpers for plant nutrient uptake. Phosphorus p: promotes early plant growth and root formation: role in cell division, essential for flowering and fruiting. Low bioavailability in soils: highly reactive p precipitates and mostly i bio-unavailable. Important in the process of sugar an starch production. Increases plant disease resistance, assists in enzyme activation and: bioavailable: k+ relatively immobile in soils. Cation exchange capacity cec of soils: anions bind to positively charged soil sites other than clay and humus. Anion vs cation uptake: cations: through cation exchange, anions: from soil water solution (dissolved) No ph-dependent anion exchange: anions react with positively charged dissolved molecules precipitate, almost never in solution almost always bio-inaccessible, especially reactive and thus problematic to access for plants. Humus: undecomposed organic matter bac, high cec.