Phosphorus losses in the soils

Question 1

b) – since P is concentrated in top
the soil losses due to erosion losses
are significant.

Answer 1

Erosion

Question 2

c) - loss is negligible due to the
low mobility of soil P.

Answer 2

Leaching

Question 3

– C:P < 200:1 organic P
is mineralized

        while it is immobilized at C/P > 200:1

Answer 3

Immobilization

Question 4

– It is the conversion of the
available P into unavailable ones

Answer 4

b) P fixation

Question 5

Phosphorus is fixed by:
a)

Answer 5

exchangeable cations in the soil solution
b) Fe and Al at broken edges of clay minerals
c) surface of aluminum and hydrous oxides.