Garden with Insight v1.0 Help: Plant params nutrients group

N optimal fraction in plant at emergence, by weight: The optimal (best) fraction of mineral nitrogen in this plant at emergence (just after germination). Used to create an S curve of optimal N concentration vs. heat unit index, which determines the amount of N demanded from the soil patch at any time.

BN1 - Nitrogen uptake parameter (N fraction in plant at emergence) 

 
Normal fraction of N in crop biomass at emergence - This parameter is based on research results 
published in the literature for this or a similar crop.  

N optimal fraction in plant at maturity, by weight: The optimal (best) fraction of mineral nitrogen in this plant at maturity (heat unit index = 1.0). Used to create an S curve of optimal N concentration vs. heat unit index, which determines the amount of N demanded from the soil patch at any time.

N fixation parameter: Adjusts sensitivity to factors that constrain N fixation (available nitrate, soil water, heat unit index) from zero (all of demand is met by fixation) to one (fixation is the most affected by constraints). Some perennial legumes are less sensitive.

Maximum annual N fertilizer allowed for plant: The maximum amount of N fertilizer the simulation can apply for this plant's growth in each year.

P optimal fraction in plant at emergence, by weight: The optimal (best) fraction of mineral phosphorus in this plant at emergence (just after germination). Used to create an S curve of optimal P concentration vs. heat unit index, which determines the amount of P demanded from the soil patch at any time.

P optimal fraction in plant at half-maturity, by weight: The optimal (best) fraction of mineral phosphorus in this plant halfway to maturity (heat unit index = 0.5). Used to create S curve of optimal P concentration vs. heat unit index, which determines the amount of P demanded from the soil patch at any time.

P optimal fraction in plant at maturity, by weight: The optimal (best) fraction of mineral phosphorus in this plant at maturity (heat unit index = 1.0). Used to create an S curve of optimal P concentration vs. heat unit index, which determines the amount of P demanded from the soil patch at any time.
S Curve - effect of labile P concentration on phosphorus uptake: An uptake factor (Y) which affects plant uptake of labile (available) phosphorus based on the concentration of soil labile P in ppm (X).

S curve shape: Soil labile P concentration (ppm) 

 
Soil labile P concentration (ppm) - Phosphorus uptake factor. The phosphorus uptake factor should range 
from > 0 to < 1 where 0 is no uptake and 1 is no restriction on uptake. The soil labile P concentration 
values for the SCRP11 will likely be between 5 and 25 ppm. 

S curve shape: N stress - plant content. 

 
N stress - plant content. The number to the left of the decimal is % of difference between plant N content 
ratios (ratio of actual potential plant N content). The number to the right of the decimal is the N stress 
factor (= 0.0 when N ratio = 0.5; = 1.0 when N ratio = 1.0).