available soil K losses
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plant removal, leaching, erosion, fixation
factors associated with high soil OM
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, - low temp and high rainfall
- lush natural vegetation
- restricted drainage
- little or no tillage
- rotation that includes sod crops
- high soil fertility (esp N availability)
Molybdenum form and function in soil/plants
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-present in nitrogenase and nitrate reductase; essential for nitrogen fixation
and assimilation
-MoO4 -2, HMoO4 -
Relationship between soil loss and slope length? (inverse or direct)
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direct (logarithmic)
rapid turnover, Labile OM
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, - living organisms: biomass
- free, identifiable dead tissue: detritus
- free bits of partially degraded tissue: particulate OM
- free or dissolved biomolecules, degradation products
relationship between soil loss and slope angle? (direct or inverse)
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direct (exponential)
Soil loss tolerance (T)
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-max amt of soil that can be lost annually by the combination of water and
wind erosion on a particular soil without degrading the soil's long-term
productivity
-US T-value: 5-11 Mg/ha
Which of the following is NOT a form of decomposition?
-oxidation
-aerobic
-fermentation
-anaerobic
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, oxidation
two carbon pools of soil OM
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- rapid turnover C, Labile OM
- protected turnover C, humus
micronutrients definition
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nutrients that are required in only minimal quantities for plant survival
Which of the following is a loss of nitrogen in the N cycle?
-wet decomposition
-fixation by clay minerals
-fertilization
-mineralization of OM
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fixation by clay minerals
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plant removal, leaching, erosion, fixation
factors associated with high soil OM
Give this one a try later!
, - low temp and high rainfall
- lush natural vegetation
- restricted drainage
- little or no tillage
- rotation that includes sod crops
- high soil fertility (esp N availability)
Molybdenum form and function in soil/plants
Give this one a try later!
-present in nitrogenase and nitrate reductase; essential for nitrogen fixation
and assimilation
-MoO4 -2, HMoO4 -
Relationship between soil loss and slope length? (inverse or direct)
Give this one a try later!
direct (logarithmic)
rapid turnover, Labile OM
Give this one a try later!
, - living organisms: biomass
- free, identifiable dead tissue: detritus
- free bits of partially degraded tissue: particulate OM
- free or dissolved biomolecules, degradation products
relationship between soil loss and slope angle? (direct or inverse)
Give this one a try later!
direct (exponential)
Soil loss tolerance (T)
Give this one a try later!
-max amt of soil that can be lost annually by the combination of water and
wind erosion on a particular soil without degrading the soil's long-term
productivity
-US T-value: 5-11 Mg/ha
Which of the following is NOT a form of decomposition?
-oxidation
-aerobic
-fermentation
-anaerobic
Give this one a try later!
, oxidation
two carbon pools of soil OM
Give this one a try later!
- rapid turnover C, Labile OM
- protected turnover C, humus
micronutrients definition
Give this one a try later!
nutrients that are required in only minimal quantities for plant survival
Which of the following is a loss of nitrogen in the N cycle?
-wet decomposition
-fixation by clay minerals
-fertilization
-mineralization of OM
Give this one a try later!
fixation by clay minerals
