Plant Nutrition and Transport

     

I. Soil

      A. Source:  weathering, organics

      B. Composition: humus, various sizes, space

C. Water: polarity, loam, gravity (capillary water, field capacity)

II. Water Movement through Plants

      A. Effects of gravity

      B. Cohesion-tension (Dixon): water potential

      C. Transpiration

      D. Absorption of water: root hairs, guttation

      E. Water movement in plants: tension in xylem

      F. Regulation of transpiration rate: stomata

      G. Other factors: CO₂, light, T, CAM, dormancy,                              morphology.

III. Nutrient Movement

      A. Through protoplast: Casparian strip & endodermis

IV. Carbohydrate Movement

      A. Translocation: storage, aphids

      B. Mass Flow: source to sink

V. Plant Nutrients

      A. Types: macronutrients & micronutrients, determined             by hydroponics

      B. Roles:

            1. K⁺, Ca⁺⁺, P, N

            2. Special: grass, N-fixing, xerophytes

      C. Fertilizer: N/P/K, eutrophication, organic fertilizer