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bacoco coco

Essential Plant Nutrients - 1 views

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

Plant nutrients

shared by bacoco coco on 09 Apr 10 - Cached
  • 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.
  • 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.
    • 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).
  • ...2 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
  • Table 2. Generalized Symptoms of Plant Nutrient Deficiency or Excess
Judi Crouch

Hypoxia in the Northern Gulf of Mexico - 2 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?
Matt Gillis

Different Types of Soil - 0 views

www.buzzle.com/...different-types-of-soil.html

biology soil plants

shared by Matt Gillis on 15 Apr 10 - Cached
  • Since soil is made up of such diverse materials like broken down rock particles and organic material, it can be classified into various types, though based on the size of the particles it contains.
    • Matt Gillis
      Matt Gillis on 15 Apr 10
       
      There are six major types of soil as shown here.
  • Soil Types
  • ...16 more annotations...
  • Sandy soil Silty soil Clay soil Loamy Soil Peaty Soil Chalky Soil
  • Sandy Soil- This type has the biggest particles and the size of the particles does determine the degree of aeration and drainage that the soil allows.
  • formed by the disintegration and weathering of rocks such as limestone, granite, quartz and shale
  • In a way sandy soil is good for plants since it lets the water go off so that it does not remain near the roots and lead them to decay.
  • the perfect soil
  • composed of minerals like Quartz and fine organic particles.
  • This type of soil can hold more moisture and at times becomes compact.
  • Clay Soil-Clay is a kind of material that occurs naturally and consists of very fine grained material with very less air spaces
  • it is difficult to work with since the drainage in this soil is low, most of the time there is a chance of water logging and harm to the roots of the plant
  • Loamy Soil- This soil consists of sand, silt and clay to some extent
  • Silty Soil-Silty soil is considered to be one of the most fertile of soils.
  • out of all the different kinds of soil loamy soil is the ideal for cultivation.
  • Peaty Soil- This kind of soil is basically formed by the accumulation of dead and decayed organic matter
  • Though the soil is rich in organic matter, nutrients present are fewer in this soil type than any other type
  • if the soil is fertilized well and the drainage of the soil is looked after, it can be the ideal for growing plants.
  • Chalky Soil-Unlike Peaty soil, Chalky soil is very alkaline in nature and consists of a large number of stones.
  • Matt Gillis on 15 Apr 10
     
    A description of six different, common types of soil and what varies between them.
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