SWAT - soil.layer.nutrients¶

mef_agri.models.soil.layer.nutrients.model_swat.py

Nitrogen¶

class mef_agri.models.soil.layer.nutrients.model_swat.Nutrients_N_V2009(**kwargs)¶

Nutrient model which contains a nitrogen model with a \(NO_3^-\), a \(NH_4^+\) pool and nitrification process.

kwargs \(\rightarrow\) mef_agri.models.base.Model

initialize(epoch)¶

Initialization of the nitrogen model.

Parameters:: epoch (datetime.date) – intialization epoch

nitrogen()¶

Child Model

Returns:: nitrogen model which considers NO3, NH4 and nitrification
Return type:: N_NO3_NH4_V2009

update(epoch)¶

Update of the nitrogen model

Parameters:: epoch (datetime.date) – current evaluation epoch

Nitrogen and Carbon¶

class mef_agri.models.soil.layer.nutrients.model_swat.Nutrients_C_N_V2009(**kwargs)¶

CN_org()¶

MQ - Random Output

\(s_{\textrm{CN-o},i,k}\ [\ ]\) - [R1] (equ. 3:5.1.5)

Returns:: C/N ratio of organic matter in the soil layer
Return type:: numpy.ndarray

CN_res()¶

MQ - State

\(s_{\textrm{CN-r},i,k}\ [\ ]\)

Returns:: C/N ratio of crop residues in the soil layer
Return type:: numpy.ndarray

bd()¶

RQ - from model with id 'zone.soil'

\(s_{\textrm{bd},0}\ [\frac{g}{cm^3}]\)

Returns:: bulk density of the soil
Return type:: Requirement

carbon()¶

Child Model

Returns:: carbon model containing C-pools for humus and crop residuals
Return type:: C_Corg_Cres_V2009

fc()¶

RQ - from model with id 'zone.soil'

\(s_{\textrm{W-fc},0}\ [\ ]\)

Returns:: soil moisture at field capacity
Return type:: Requirement

initialize(epoch)¶

Initialization of nitrogen and carbon model.

Parameters:: epoch (datetime.date) – initialization epoch

lt()¶

RQ - from model with id '.__parent__' (parent soil layer)

\(s_{\textrm{lt},i,0}\ [mm]\)

Returns:: layer thickness
Return type:: Requirement

ltemp()¶

RQ - from model with id '.__parent__.temperature' (temperature model of parent soil layer)

\(s_{\textrm{T-t},i,k}\ [^\circ C]\)

Returns:: soil layer temperature
Return type:: Requirement

lwa()¶

RQ - from model with id '.__parent__.water' (water model of parent soil layer)

\(s_{\textrm{W-a},i,k}\ [mm]\)

Returns:: water amount of soil layer
Return type:: Requirement

nh4()¶

RQ - from model with id '.nitrogen' (child nitrogen model)

\(s_{\textrm{NH}_{4}^{+},i,k}\ [\frac{kg}{ha}]\)

Returns:: amount of ammonium in the soil layer
Return type:: Requirement

nitrogen()¶

Child Model

Returns:: nitrogen model which considers NO3, NH4 and nitrification as well as organic N-pool, mineralization and residue decomposition
Return type:: N_NO3_NH4_Norg_V2009

no3()¶

RQ - from model with id '.nitrogen' (child nitrogen model)

\(s_{\textrm{NO}_{3}^{-},i,k}\ [\frac{kg}{ha}]\)

Returns:: amount of nitrate in the soil layer
Return type:: Requirement

nutrient_cycling_factor()¶

MQ - Random Output

\(s_{\textrm{ncf},i,k}\ [\ ]\) - [R1] (equ. 3:1.2.1, 3:1.2.2)

Returns:: factor combining soil temperatur and water influence on nutrient cycle
Return type:: numpy.ndarray

update(epoch)¶

The carbon and nitrogen models are updated and the following computations are performed

nutrient cycling temp. factor - [R1] (equ. 3:1.2.1)
nutrient cycling water factor - [R1] (equ. 3:1.2.2)
combined effect ncf = np.sqrt(ncf_t * ncf_w)
CN-ratio of organic matter - [R1] (equ. 3:5.1.5)

Parameters:: epoch (datetime.date) – current evaluation epoch