Notes on Plant Nutrition and Soils

Notes on Plant Nutrition and Soils - Plant Nutrition and...

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Plant Nutrition and Soils Soil Highly weathered outer layer of the Earth’s crust - mixture of sand, rocks, clay, silt, humus, minerals, organic matter, and microorganisms Water and Minerals in Soil Soil Loss If topsoil is lost, soil’s water-holding capacity and nutrient content are adversely affected Intercropping – mixing of crops in field Saline Soils Alter water potential, leading to a loss of water and turgor in plants Normal vs. Acidic Soils In normal soil, positively charged mineral ions are attracted to the negative charged soil particles Acidic soils release minerals, such as aluminum, that are toxic to plants Plant Nutrients Other Plant Nutrients Macronutrients - used in relatively large amounts - nine = C, O, H, N, K, Ca, Mg, P, and S Other Plant Nutrients Micronutrients - used in minute amounts - seven = Cl, Fe, Mn, Zn, B, Cu, and Mo
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Other Plant Nutrients Deficiency of any one can have severe effects on plant growth Special Nutritional Strategies:
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Unformatted text preview: Nitrogen Fixation Plants need ammonia (NH 3 ) or nitrate (NO 3 – ) to build proteins- lack the biochemical pathways necessary to convert N 2 to NH 3 • Symbiotic relationships have evolved between plants and nitrogen-fixing bacteria- legumes form root nodules that house the bacterium Rhizobium Special Nutritional Strategies: Nitrogen Fixation Found in about 90% of vascular plants Substantially expand the surface area available for nutrient uptake Enhance uptake of phosphorus and micronutrients Carbon–Nitrogen Balance The Intergovernmental Panel on Climate Change (IPCC) has concluded that CO 2 is maybe at its highest level in 20 million years- correlates with increases in many human activities, including the burning of fossil fuels Increased CO 2 levels may alter C–N ratio in a plant- important for plant health, health of herbivores, and human nutrition Photosynthesis vs. Photorespiration Carbon-Nitrogen Balance...
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  • Fall '14
  • Lycadine
  • Nutrition, Sperm, plant nutrients, Special Nutritional Strategies, saline soils

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