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Pascale Michelon

Plant hormone and growth regulators - 0 views

extension.oregonstate.edu/...hormones.html

plant hormones

shared by Pascale Michelon on 11 Apr 10 - Cached
  • (Table 5)
  • Hormones are produced naturally by plants, while plant growth regulators are applied to plants by humans
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      This is interesting because it shows you that if you want to manipulate hormones in an experiment you can use plant growth regulators to mimic the action of hormones.
  • ...3 more annotations...
  • There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA).
  • Ethylene is unique in that it is found only in the gaseous form. It
  • induces ripening, causes leaves to droop (epinasty) and drop (abscission), and promotes senescence.
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      The effects of ethylene (promotion of both aging/death and ripening) may explain why just one bad apple in a basket may spoil the whole bunch.
  • Pascale Michelon on 11 Apr 10
     
    Plant hormones and growth regulators are chemicals that affect flowering; aging; root growth; killing of leaves; prevention or promotion of stem elongation; color enhancement of fruit; prevention of leafing and/or leaf fall; etc.
Judi Crouch

Hypoxia in the Northern Gulf of Mexico - 0 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?
blaire stillwell

AccessScience | Encyclopedia Article | Soil fertility - 1 views

www.accessscience.com/content.aspx

BradBioA

shared by blaire stillwell on 09 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. Some plant species also require one or more of the elements cobalt, sodium, vanadium, and silicon.
  • 13 essential mineral nutrien
  • J. R. Brown (ed.), Recommended Chemical Soil Test Procedures for the North Central Region, Missouri Agricultural Experiment Station, Columbia, 1998
    • Laura Bradford
      Laura Bradford on 09 Apr 10
       
      The article highlighted is worth looking up. Contains information on experimental procedures and how to handle your soil samples.
  • Laura Bradford on 09 Apr 10
     
    Soil Fertility: How is this important to growth of a plant?
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
       
      Nutrients (in the soid) are needed either in large amounts (macronutrients), medium amounts (micronutrients), or in trace amounts
  • ...5 more annotations...
  • 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).
  • 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
  • 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
blaire stillwell

The Nature of Phosphorous in Soils - 0 views

www.extension.umn.edu/...DC6795.html

BradBioA Blaire Phosphorous and plant growth nutrients

shared by blaire stillwell on 14 Apr 10 - Cached
  • blaire stillwell on 14 Apr 10
     
    The nutrient Phosphorous in soils and how it affects plant growth.
  • blaire stillwell on 14 Apr 10
     
    The nutrient Phosphorous in soils and how it affects plant growth.
blaire stillwell

Soil Fertility: How Does Your Garden Grow? - 0 views

soil.gsfc.nasa.gov/...npk.htm

BradBioA

shared by blaire stillwell on 21 Apr 10 - Cached
  • WHY PLANTS LIKE PHOSPHORUS (P):
  • HOW PHOSPHORUS MOVES THROUGH THE SOIL AND HOW PLANTS TAKE UP PHOSPHORUS:
  • WHAT HAPPENS WHEN PLANTS DON'T GET ENOUGH PHOSPHORUS:
  • ...1 more annotation...
  • WHAT HAPPENS WHEN PLANTS GET TOO MUCH PHOSPHORUS:
  • blaire stillwell on 21 Apr 10
     
    WHY PLANTS LIKE PHOSPHORUS (P): HOW PHOSPHORUS MOVES THROUGH THE SOIL AND HOW PLANTS TAKE UP PHOSPHORUS: WHAT HAPPENS WHEN PLANTS DON'T GET ENOUGH PHOSPHORUS: WHAT HAPPENS WHEN PLANTS GET TOO MUCH PHOSPHORUS:
Gabby Harris

Common Mistakes to Avoid for New Gardeners - New to Gardening - 0 views

faq.gardenweb.com/...2000065545010342.html

shared by Gabby Harris on 11 May 10 - Cached
  • Overcrowding Overcrowding plants doesn't do it any favors. Plants need room to breathe and good air circulation. They also need light to reach them and planting too densely blocks the plants ability to reach it's full potential. Overcrowding stresses plants and makes them more prone to disease.
blaire stillwell

G9181 Agricultural Phosphorus and Water Quality | University of Missouri Extension - 0 views

extension.missouri.edu/...DisplayPub.aspx

BradBioA

shared by blaire stillwell on 19 Apr 10 - Cached
  • blaire stillwell on 19 Apr 10
     
    Phosphorus Limitations
jack sippel

PLANT GROWTH AND TEMPERATURE - 0 views

http://extension.oregonstate.edu/mg/botany/heat.html

BradBioA plant organic chemical nutrients fertilizer vs Phosphorous mineral l bradford

started by jack sippel on 21 Apr 10 no follow-up yet
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