Alley Cropping Row Spacing Light Share Calculator
Budget observed alley union-shadow width and independent shadow transmission into width-mean light share, not Beer–Lambert LAI or predicted crop yield. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
An alley light proxy combines the unshadowed fraction with supplied transmission through the shadowed portion.
An alley light proxy combines the unshadowed fraction with supplied transmission through the shadowed portion.1
It summarizes a measured cross section rather than a season-long radiation or crop-growth model. Use this tool to calculate alley cropping row spacing light share from the supplied measurements and assumptions.
When to use Alley Cropping Row Spacing Light Share Calculator
Use this tool to calculate alley cropping row spacing light share from the supplied measurements and assumptions. Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
How to use Alley Cropping Row Spacing Light Share Calculator and understand its results
- Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
- Enter observedAlleyWidthsM, observedTreeShadowWidthsM, observedShadowLightTransmissionFractions, using the field meanings and rules below, then run the tool.
- Read modeledAlleyAreaMeanLightFractions. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedAlleyWidthsM | Observed alley widths m | list of number | Required |
| observedTreeShadowWidthsM | Observed tree shadow widths m | list of number | Required |
| observedShadowLightTransmissionFractions | Observed shadow light transmission fractions | list of number | Required |
Enter nonempty aligned positive alley widths, shadow widths between zero and alley width, and transmission fractions in [0,1]. Return 1−(shadowWidth/alleyWidth)×(1−transmission) for each observation. No time integration, canopy radiation transfer or crop response is modeled.
lightFraction_i=1−(shadowWidth_i/alleyWidth_i)×(1−shadowTransmission_i) Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| modeledAlleyAreaMeanLightFractions | Modeled Alley Area Mean Light Fractions; follow the units, sign, ordering and evidence convention stated above | list of number |
{
"input": {
"observedAlleyWidthsM": [
10,
20
],
"observedTreeShadowWidthsM": [
2,
5
],
"observedShadowLightTransmissionFractions": [
0.5,
0.2
]
},
"output": {
"modeledAlleyAreaMeanLightFractions": [
0.9,
0.8
]
}
}Limitations and assumptions
It summarizes a measured cross section rather than a season-long radiation or crop-growth model. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Foliage Height Diversity Index Calculator for this related task: Vertical foliage diversity summarizes how measured foliage is distributed among chosen height bins.
Use Silvopasture Shade Percent Heat Stress Relief when its separate inputs and assumptions fit the question: A shade-temperature mixture weights shaded and sun-exposed temperatures by the observed shaded fraction.
References
Similar or alternative tools
- Foliage Height Diversity Index Calculator
Vertical foliage diversity summarizes how measured foliage is distributed among chosen height bins.
- Silvopasture Shade Percent Heat Stress Relief
A shade-temperature mixture weights shaded and sun-exposed temperatures by the observed shaded fraction.