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bacoco coco

Essential Plant Nutrients - 0 views

www.cartage.org.lb/...EssentialPlant.htm

Plant nutrients

shared by bacoco coco on 09 Apr 10 - Cached
  • Plants require 13 mineral nutrient elements for growth
  • Macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium and sulfur) are plant nutrients required in the largest amount in plants. Micronutrients (iron, copper, manganese, zinc, boron, molybdenum and chlorine) are required in relatively smaller amounts. Additional mineral nutrient elements which are beneficial to plants but not necessarily essential include sodium, cobalt, vanadium, nickel, selenium, aluminum and silicon
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Plants can be damaged is there is too much of one nutrient (toxicity) or not enough of a nutrient (deficiency).
  • ...5 more annotations...
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Nutrients (in the soid) are needed either in large amounts (macronutrients), medium amounts (micronutrients), or in trace amounts
  • A nutrient deficiency occurs when the nutrient is not in sufficient quantity to meet the needs of the growing plant. Nutrient toxicity occurs when a plant nutrient is in excess and decreases plant growth or quality
  • Five types of deficiency or toxicity symptoms are observed:
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Here are the visible signs if the soil does not have enough of or too much of a nutrient.
  • Essential plant nutrients: their relative amounts in plants, functions and classification
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      This table may be helpful in determining a topic for an experiment. You would only want to choose one nutrient with which to run an experiment.
  • Table 2. Generalized Symptoms of Plant Nutrient Deficiency or Excess
Judi Crouch

Hypoxia in the Northern Gulf of Mexico - 1 views

www.gulfhypoxia.net/Overview

Crouch

shared by Judi Crouch on 12 Apr 10 - Cached
  • Hypoxia, or oxygen depletion, is an environmental phenomenon where the concentration of dissolved oxygen in the water column decreases to a level that can no longer support living aquatic organisms.
  • Hypoxic and anoxic (no oxygen) waters have existed throughout geologic time, but their occurrence in shallow coastal and estuarine areas appears to be increasing as a result of human activities (Diaz and Rosenberg, 1995). The largest hypoxic zone currently affecting the United States, and the second largest hypoxic zone worldwide, occurs in the northern Gulf of Mexico adjacent to the Mississippi River on the Louisiana/Texas continental shelf.
  • What causes hypoxia? Major events leading to the formation of hypoxia in the Gulf of Mexico include: Freshwater discharge and nutrient loading of the Mississippi River Nutrient-enhanced primary production, or eutrophication Decomposition of biomass by bacteria on the ocean floor Depletion of oxygen due to stratification
  • ...5 more annotations...
  • Mississippi River nutrient concentrations and loading to the adjacent continental shelf have greatly changed in the last half of the 20th century. During this time there has been a marked increase in the concentration of nitrogen and phosphorous in the Lower Mississippi River. This increase has been attributed to the increased use of nitrogen and phosphorous fertilizers,
  • Eutrophication
  • eutrophication initiates a massive growth of phytoplankton on the water’s surface.
  • This stratification leaves the bottom layer isolated from the surface layer and cut off from a normal resupply of oxygen from the atmosphere.
  • Hypoxia was first documented in the northern Gulf of Mexico off the Louisiana coast in 1972.
  • Judi Crouch on 12 Apr 10
     
    Good intro to the concept of "dead zones" (hypoxia)
  • Judi Crouch on 12 Apr 10
     
    This is a good introduction to the concept of a "dead zone."
  • Judi Crouch on 12 Apr 10
     
    What does anthropogenically mean?
Andrew Schaberg

AccessScience | Encyclopedia Article | Soil fertility - 0 views

www.accessscience.com/content.aspx

shared by Andrew Schaberg on 13 Apr 10 - Cached
  • Sixteen chemical elements are required for the growth of all plants: carbon, oxygen, and hydrogen (these three are obtained from carbon dioxide and water), plus nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, zinc, copper, boron, molybdenum, and chlorine.
  • Fertility levels can vary from a deficiency to a sufficiency, or even toxicity (too much), of one or more nutrients.
  • soil considered fertile in all other ways could have levels of available potassium too low for optimum plant growth
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  • The type of crop grown on a particular soil determines the required soil fertility level.
  • Andrew Schaberg on 13 Apr 10
     
    soil fertility
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