BI111 Chapter Notes - Chapter 40: Nitrogen Fixation, Hydroponics, Stunted Growth
Document Summary
By weight, tissues of most plants are >90% water. Most of plant"s nutrition comes from photosynthesis. Smaller amounts of other nutrients come from soil or water. He then grew plants and studied their growth after eliminating one element at a time. 20. 1c essential macro- and micronutrients for plants: hydroponics revealed plants need 17 essential elements, essential element: one that is necessary for normal growth and reproduction and cannot be replaced by another element. 9 of elements are macronutrients because plants incorporate large amounts of them in tissues: carbon, hydrogen, oxygen make up 96% Obtained from air and water whereas others are from soil. Extensive root systems are adaptations to limited mineral nutrients. Make up 20-50% of total plant mass. Roots grow as long as plant lives. Associations between fungus and roots of plant (phosphorous) Soil-mineral particles, compounds, ions, decomposing organics, water, air, organisms. Relative amount of soil particles determine soil properties.
