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Plant Nutrition Nutritional Requirements-Essential Element: required for plant to complete life cycle and produce another generation --Macronutrients (large amounts): SPONCH + K, Ca, Mg --Micronutrients (small amounts): Fe, Mn, Zn, Cu, others. Soil Quality-Texture: topsoil with humus (decayed organic material) prevents packing of clay à porous (retain water) yet aeration of roots-Chemical composition: cation exchange – roots add H+ to soil to replace cations (K+, Ca2+, Mg2+) absorbed by plant Mutualistic Relationships1. Rhizobium bacteria: supply nitrogen at roots (fix atmospheric N2 to usable N)2. Mycorrhizae (plant + fungus): increase absorption of water and minerals Unusual nutritional adaptations:-Epiphytes = grow on another plant, absorb water from rain through leaves-Parasitic plants = not photosynthetic; absorb sugar and minerals from living hosts ex: mistletoe, dodder, indian pipe-Carnivorous plants = photosynthetic, but obtain same nitrogen and minerals by digesting small animals
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