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16 Cards in this Set
- Front
- Back
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Thermodynamic Concepts
1 and 2 law of Thermodynamics |
Energy is neither created nor destroyed.
Transformations of energy are inefficient released in the form of waste heat |
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Gross Primary Production
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total energy assimilated by primary producers
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Net Primary Prodcution
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Energy accumulated in stored form by primary producers
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Respiration=
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gross-net, the energy consumed by producers for maintenance and biosynthesis
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What Limits Primary Production
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Efficiency is between 1-2%,
limis: Light Temp Water Nutrient |
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Ecological vs Cultural Energy
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Ecological- energy inputs are direct or indirect solar gains; remained fixed
Cultural- supplied by humans to achieve ag obj industrial- non bio sources Biological- from animal and human sources |
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Macronutrients
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N, P, K, Ca, Mg, S,
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Liebig's Law of the minimum
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organisms are generally limited by only 1 single factor that is in short supply relative to demand
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Importance of Nitrogen
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most limiting nutrient
Adequate N produces higher yields N fertilizer is expensice |
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Nitrification
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oxidation of NH4+ to NO3- by two specialized groups of autotrophic bacteria
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Organic N
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living and dead plants >95% of total N
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Inorganic N
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Nitrate
Nitrite Ammonium |
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Denitrificication
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Conversion of NO3- to N2 gas
affected by o2 availability energy availability NO3 conc |
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Haber Bosch Process
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synthesizing ammonia fertilizer from N2
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6 N losses
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surface runoff
leaching denitrification volitization Harvest burning |
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Reducing Nutrient pollution
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vegetable buffer strips for filtration
cover cropping |
