L1 /
18
CH3041
NUTRIENT INPUTS
• Dissolved Inorganic Phosphorus (DIP) is
present in several forms: H3PO4 D H2PO4- + H+
H2PO4- +H+ D HPO42- + 2H+ HPO42- + H+ D PO43- + H+
present in several forms: H3PO4 D H2PO4- + H+
H2PO4- +H+ D HPO42- + 2H+ HPO42- + H+ D PO43- + H+
plants adsorb
These soluble forms are not readily leached
from soils Ca3(PO4)2(s). Normal [DIP] » 2 m M.
from soils Ca3(PO4)2(s). Normal [DIP] » 2 m M.
• Nitrate
(NO3-) and Ammonium (NH4+) are
the two key soluble forms of nitrogen.
NH4+ - N(-III), Plants use mainly NO3- - N(V).
the two key soluble forms of nitrogen.
NH4+ - N(-III), Plants use mainly NO3- - N(V).
• Sewerage & agriculture Ò PO43-(aq), NO3-(aq).
• The N /
P ratio is variable (»10) in rivers but does indicate the state of the inputs.
