Table 1 Equation to quantify phosphorus efficiency (PUEa + c) and phosphorus loss (PL) from crop-livestock system by SFA model.
\(\:{{PUE}}_{{c+a}}\) | \({{ = }}{{O_{{mainproduct}} } \mathord{\left/ {\vphantom {{O_{{mainproduct}} } {I_{{total}} }}} \right. \kern-\nulldelimiterspace} {I_{{total}} }}{{ \times 100}}\) |
\(\:{O}_{mainproduct}\) | \(\:{=\,PI}{fer}{+\:PI}{if}{-PL}\) |
\(\:{I}_{total}\) | \(\:{=\,}{\:PI}{fer}{+\:PI}{if}\) |
\(\:{PL}\) | \(\:{=\,}{PO}{rf}{\:+PO}{le}{+PO}{manure-le}{+PO}{soil}\) |
Where, | |
\(\:{O}_{mainproduct}\) | Output of P in main product from crop and animal production |
I_total | Total P input from crop and livestock system |
PIfer | Input of P via synthetic fertilizer including single and compound fertilizer |
PIif | Input of P to animal production via feed from outside the municipality |
POmain−crop | Output of P via main crop products from crop production |
POst | Output of P via straw from crop production |
PIlf | Input of P to animal production via local feed |
POAMMP | Output of P via main animal products from animal production |
POAMSP | Output of P via animal by-products from animal production |
POmanure | Output of P via animal manure |
PIam | Input of P via animal manure application on land |
PIst | Input of P via straw retuning to the land |
POsoil | Output of P via accumulated in soil |
POrf | Output of P via runoff and erosion |
POle | Output of P via leaching |
POmanure−le | Output of P via animal manure directly discharge into surface water |
