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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?
Gabby Harris

Organic vs. Synthetic Fertilizers - 0 views

http://www.organicgardeningguru.com/fertilizers.html

started by Gabby Harris on 14 Apr 10 no follow-up yet
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:
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?
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
jack sippel

THE EFFECT OF TEMPERATURE ON PLANT GROWTH - 0 views

http://arjournals.annualreviews.org/doi/abs/10.1146/annurev.pp.04.060153.002023?cookieSet=1&journalCode=arplant.1

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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