Agriculture and Forestry

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Chemical Application Rate (GPA) - The gallons per acre a sprayer applies, or the speed and nozzle flow that hit a target rate.
Timber Cruise (Doyle / Scribner / International 1/4) - Board feet per log by Doyle, Scribner public-domain table, or International 1/4.
Planting Density and Seed Rate - Seeds and pounds per acre from row spacing, target population, germination, and seed price.
Tractor Drawbar Power - Drawbar HP = (pull * speed) / 375; PTO HP estimate from public benchmark.
Irrigation Sprinkler Uniformity - Christiansen CU and Distribution Uniformity from catch-can readings; pass/fail at 85% and 75%.
Soil Bulk Density and Compaction - Bulk density, total porosity, and compaction flag against texture-class threshold.
Crop Yield and Harvest Loss - Yield bu/acre adjusted to standard moisture, plus optional ground-loss percent.
Temperature-Humidity Index (Livestock) - Temperature-humidity index and heat-stress band by species, with a cooling recommendation.
Sprayer 1/128-Acre Calibration - USDA Extension 1/128-acre method: boom width determines travel distance, ounces collected per nozzle equals GPA.
Irrigation Requirement (ET-based, acre-feet) - Crop ET demand (Kc x ET0 x days), net and gross irrigation depth after rainfall and application efficiency.
Fertigation / Chemigation Injection Rate - The injection-pump rate to apply a liquid fertilizer or chemical through an irrigation system.
Available Water and MAD Irrigation Trigger - When to irrigate and how much, from the soil water reservoir (FAO-56 / NRCS).
Carcass Dressing Percentage and Freezer Yield - The dressing percentage and take-home meat yield of a slaughter animal, for pricing freezer beef, pork, or lamb.
Pre-Harvest Corn Yield (Yield Component Method) - An in-season corn grain-yield estimate from three field counts.
Cattle Live Weight from Heart Girth - A beef animal's live weight from two tape measurements -- the weigh-tape method when no scale is handy.
Cattle Stocking Rate (AUM) - Available forage (production x area x utilization), animal-unit-months of carrying capacity, head supported.
Grain Bin Capacity (Bushels) - Cylinder plus cone volume of a round bin in cubic feet and bushels (ft^3 x 0.8036).
Grain Drying Shrink and Net Bushels - Moisture shrink from wet to market moisture, dried weight, handling shrink.
Livestock Dry-Matter Intake and As-Fed Ration - Dry-matter intake (body weight x intake %) restated as as-fed bunk weight at the feed dry-matter content.
Nutrient-Based Manure Application Rate - Manure application rate to meet a crop's nitrogen or phosphate need.
NPK Fertilizer Blend from Soil Test - Nutrient recommendation (max(0, crop demand - soil-test credit)) for N / P2O5 / K2O.
Pesticide Tank-Mix and Acres per Tank - Acres treated per tank (tank gal / GPA), product per tank in the entered unit with gal / mL or lb / g conversions.
Pesticide REI / PHI Clock - Time remaining on the restricted-entry interval and pre-harvest interval from elapsed time since application.
Growing Degree Days - Accumulated growing degree days from a daily Tmax/Tmin series, a crop base temperature, and an optional upper cutoff.
Reference Evapotranspiration ET0 (Hargreaves / FAO-56) - Reference evapotranspiration (ET0) from air temperature alone.
Pearson-Square Feed Ration - Parts and percent of two feeds to hit a target nutrient level via the Pearson square.
Livestock Water Requirement - Gallons per head per day and total herd demand by temperature interpolation between user-supplied breakpoints.
Mulch, Topsoil, and Aggregate Volume - Mulch, topsoil, or gravel for a bed, in yards, bags, and tons.
Grain Drying Energy and Fuel - The water a grain dryer has to remove, and the propane it burns doing it.
Manure Nutrient Application Rate - N-based rate = crop N need / (total N x availability).
Center-Pivot Application Depth and Runtime - Hours per pass, gross capacity per acre, and net depth of a center-pivot irrigation system.
Center-Pivot Outer-Span Application Rate vs Soil Intake - Whether a center pivot's outer span applies water faster than the soil can take it.
Center-Pivot Percent-Timer to Depth - The number the operator turns at the panel: the end-tower percent timer, converted to applied depth.
Stored-Grain Aeration Fan Airflow - The fan airflow to cool or dry stored grain.
Waste Storage Facility Volume (NRCS 313) - Waste storage volume by NRCS 313: manure, wastewater, bedding, precipitation, and freeboard.
Manure Storage Roof Savings (Covered vs Open) - The manure storage volume a roof buys back by keeping rainfall out of the pit.
Two-Stroke Fuel Mix - Oil to add for a two-stroke gas:oil mix (chainsaws, trimmers, outboards).
Two-Stroke Mix Ratio Check - The gas:oil ratio you ACTUALLY made from the oil you poured.
Green Log and Limb Weight - Green weight and volume of a log or limb from its butt / top diameter, length.
Tractor Drawbar Pull from Power - The drawbar pull a tractor develops at a working speed for a given power.
Anhydrous Ammonia Rate from Target Nitrogen - The anhydrous ammonia product a nitrogen target needs.
Tractor Ballast for a Target Weight-to-Power Ratio - The ballast to add or remove to hit a target weight-to-power ratio.
Grain Bin Wall Height for a Target Capacity - The eave (wall) height a round bin needs to hold a target bushel capacity.
Bunker (Horizontal) Silo Forage Capacity - The forage a horizontal bunker or trench silo holds.
Feed Conversion Ratio and Average Daily Gain - Two production metrics from a feeding period.
Tree Rigging Shock (Dynamic) Load - Estimated peak dynamic load and the multiplier over static weight when a piece is dropped and caught on a lowering line.
Felling Notch and Hinge Geometry - Recommended open-face notch depth, hinge thickness, and hinge width from the felling-cut diameter.
Friction-Device Hold Force by Wraps - Hand-side hold force for 1 to 4 wraps on a porta-wrap or lowering bollard by the capstan equation.
Brush Chip Volume and Haul Loads - Loose chip volume and the number of chip-truck loads from the green weight of the wood.
Basal Area per Acre (Prism Cruise) - Stand basal area per acre from a variable-radius (prism / angle-gauge) point sample.
Reineke Stand Density Index - Stand density index and its percent of the species maximum: the thin-now metric.
Thinning Target TPA From a Target SDI - The residual-stand number the prescription needs.
Quadratic Mean Diameter (from a Tally) - The QMD the Reineke stand density index requires, straight from the tally sheet.
Hollow / Decayed Trunk Strength Loss - A tree-risk screen for a standing tree with internal decay.
Minimum Sound Shell for an Allowable Trunk Strength Loss - The minimum radial sound-wood shell thickness for a maximum acceptable strength loss.
Tree Appraisal by the CTLA Trunk Formula - The arborist bench is all biomechanics - decay, cavity, protection zone.
Open-Cavity Trunk Strength Loss (Smiley & Fraedrich) - Strength loss in a trunk with an OPEN cavity.
Tree Protection / Critical Root Zone - The ANSI A300 Part 5 tree protection zone (critical root zone) to fence off during construction.
Critical Root Zone Encroachment Percent - How much of a tree's critical root zone a construction limit line cuts off, judged against species tolerance.
Live Crown Removal Limit (Pruning Dose) - The ANSI A300 Part 1 live-crown removal check.
Clinometer Tree Height (Percent-Slope) - Tree height from a clinometer's percent scale.
Firewood Cord Volume - How many cords a firewood stack holds: a full (standard) cord is 128 stacked cubic feet (a 4 x 4 x 8 ft rick).
Nozzle Flow vs Pressure and Tip Selection - Flow at the operating pressure from a tip's catalog flow via the square-root law.
Downwind Spray Drift Buffer - A relative downwind no-spray buffer that scales an editable droplet-class base by wind speed and release height.
Sprayer Field Capacity and Spray Time - Theoretical and effective acres per hour, the spray time for a field, and the tank loads needed, from boom width.
Hay Dry-Matter and Safe-Storage Weight - The dry-matter pounds in a bale (weight x (1 - moisture)).
Sprinkler Precipitation Rate - The precipitation rate a valve zone applies.
Sprinkler Zone Flow for a Target Precip Rate - The total zone flow a target precipitation rate needs over a covered area.
Irrigation Zone Runtime and Cycle-and-Soak - The controller runtime to apply a target depth.
Drip Zone Flow and Valve Capacity - The total emitter flow on a drip zone (gph and gpm) and its utilization against the valve / lateral flow limit.
Plant Spacing Count (Square and Triangular) - The plant count for a bed at a given on-center spacing.
Sod Takeoff (Slabs and Pallets) - The sod order from a lawn area: ordered area with a cut/edge waste allowance (in ft^2 and square yards).
Sawmill Overrun and Lumber Recovery Factor - Overrun is a property of the SCALE RULE, not only of the mill.
Lumber Kiln Drying Time and Schedule Duration - Drying time goes roughly as the SQUARE of thickness.
Kiln Charge Water Weight, Energy, and Vent Load - Wood moisture content is on an OVEN-DRY basis -- water weight over the oven-dry wood weight, not over total weight.
Bandmill Blade Speed, Feed, and Bite per Tooth - Bite per tooth is the number a filer tunes a mill around.
Sawmill Residue, Sawdust, and Chip Yield - About half a log does not become lumber, and where that half goes decides whether a mill has a revenue stream...
Log Truck Payload and Legal Load Volume - A log truck is legal on weight and paid on scale, and the two do not measure the same thing.

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