Fertilizer Sources and Soil Fertility Management

FERTILIZERS SOURCES

  • Different sources of fertilizers include natural mineral sources, synthetics, and organic materials.

NUTRIENT DEPLETION RATE

  • Ecosystems analyzed for nutrient depletion:
    • Prairie
    • Forest
    • Agricultural Land
  • Key Consideration: Agricultural land typically depletes nutrients at the highest rate due to intensive farming practices.

TREND IN FERTILIZER CONSUMPTION

  • Fertilizer Consumption and World Population Over Time:
    • 1930 to 2010, marked growth in fertilizer consumption correlating with rising population.
    • Data Highlights:
      • 1930: Minimal fertilizer use
      • 1950: Significant rise in fertilizer use due to global population increase.

ADOPTION OF COMMERCIAL FERTILIZERS

  • 1940s Highlights:
    • Increased availability of nitrogen fertilizers.
    • Historical Context:
      • Research during WWII spurred the production of nitrogen for fertilizers post-war.
      • Development of solid ammonium nitrate pellets, though hazardous due to explosiveness.
      • Mid-1940s innovation led to the safe direct injection of anhydrous ammonia into soil (contains 82% nitrogen).

DEMAND FOR FERTILIZER AND SOIL FERTILITY

  • The growing world population continues to drive the demand for fertilizers to sustain agricultural productivity.

FARM NUTRIENT FLOW 100 YEARS AGO vs NOW

  1. Historical Practices:
    • Combined grain and livestock production.
    • Diverse crop rotation enhanced soil health.
    • Integrated localized fertilizer sources.
  2. Modern Practices:
    • Separation of farming types.
    • Heavy reliance on commercial fertilizers leads to loss of biodiversity.
    • Fields often left fallow during winter.

NUMBER OF FARMS

  • Historical Data on Farms:
    • As the number of farms decreased, the size of each farm has increased, indicating industrialization in agriculture.

TYPES OF FERTILIZER

  • Categories Include:
    • Inorganic
    • Synthetic Organic
    • Mineral
    • Organic
  • Key figures mentioned for example grades: 5-10-5 indicating nutrient content breakdown (Nitrogen, Phosphate, Potash).

COMMON INORGANIC FERTILIZERS

  • Examples include:
    • Anhydrous Ammonia (NH₃): 82-0-0
    • Ammonium Nitrate (NH₄NO₃): 33.5-0-0
    • Diammonium Phosphate ((NH₄)₂HPO₄): 18-46-0

ADVANTAGES & DISADVANTAGES OF INORGANIC FERTILIZERS

  • Advantages:
    • Highly soluble, consistent and high nutrient content.
    • Different usable forms (granular/liquid).
  • Disadvantages:
    • High cost and potential for nutrient leaching.

SYNTHETIC ORGANIC FERTILIZERS

  • Includes manufactured fertilizers that are chemically organic.
  • Common Examples: Urea, Ammonium Nitrate.
  • Advantages include high availability, while Disadvantages consider expense and volatility.

NUTRIENT VARIABILITY IN ANIMAL MANURE

  1. Factors Impacting Manure Content:
    • Animal type & Diet (High percentages of nutrients excreted).
    • Storage conditions affecting moisture.

MAJOR NUTRIENT CONTENT SUMMARY TABLE

  • Summary for Livestock Types: E.g., Dairy, Beef, Poultry showing varied nutrient concentrations in manures (Solid vs. Liquid).

APPLICATION RATES AND CALCULATIONS

  • Example formulas for determining nutrient availability based on the application of manure types (e.g., calculating N from specific application of beef cattle manure).

ENVIRONMENTAL IMPACT OF MANURE USE

  • Proper management practices are critical to mitigate issues such as ammonia volatilization and nutrient runoff.
  • Recommended application guidelines to prevent environmental contamination.

COMMON FERTILIZERS

  • Common Nitrogen Fertilizers:
    • Urea, Ammonium Nitrate, Diammonium Phosphate.
  • Common Phosphate and Potassium Fertilizers:
    • Various grades and applications of Potash and Phosphates shown in detail.

FERTILIZER CALCULATIONS

  • Practical examples of how to compute the nutrient values from fertilizer grades and necessary amounts for application.
  • Calculations Include:
    • Example of how to derive elemental N, P, and K content from fertilizer grades based on given weight amounts.

FERTILIZER LABELS

  • Importance of understanding nutrient percentage breakdown on fertilizer labels to inform correct application rates.

CREATING A FERTILIZER BULK BLEND

  • Stepwise methodology in constructing custom blends involving multiple types of fertilizers while adhering to target nutrient ratios.