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wk 14
13 cards·by tristanscards
what ways are nitrogen and phosphorous similar
theyre both removable by plant uptake, pH has effect
what ways are nitrogen and phosphorous different
N- susceptible to leaching. P- not mobile or susceptible
2 predominetn plant available forms of phosphorous in soils
dihydrogen phosphate and hydrogen phosphate
what types of cations does phosphorous precipitate at low ph? High?
aluminum and iron oxides, Calcium
3 primary minerals potassium is found
biotite mica, muscovite mica, orthoclase
plant available form of potassium in soil
k+
What kind of clay minerals is potassium fixed in a slowly available form? why is it fixed in this
kind of clay mineral?
2:1 clays, b/c no hydrolic shell--> physiosorption
what kind of soils and mgt practices result in K defficensies
no fertilization, serpentine/ calareous soils
what disease of ruminant animals is caused by insignificant amounts of Mg?
Tetany (hypomagnesia)
What imbalance in plant nutrients occurs with serpentine derived soils
high mag low potassium uptake
3 main envr issues w/ soil/soil fertility and water?
nitrate, phosphorous, sediments
Major way nutrient status can be evaluated in soils or plants
mg in soil + ca/mg ratio
main limitation of soil testing
cost and area