GDD Growth Stage Agriculture Tools
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GDD Growth Stage Calculator

енгізу a budbreak or bloom date, қосу daily температура data, and get the current growth stage and harvest forecast in one place.

No weather API is required. You can paste CSV, upload a file, or type rows by hand, then edit the stage профиль to match your сорт.

Works with CSV, file upload, or қолмен rows
Supports Celsius and Fahrenheit
Stage tables stay fully editable
Shareable state stays in the браузер

Calculation assumptions

  • GDD шектер vary by сорт, region, tree age, vigor, crop жүктеу, and pruning. Edit the template мәндер instead of using them as-is.
  • Harvest forecasts are estimates based on соңғы daily GDD averages. They can drift when temperatures swing sharply.
  • If your CSV has gaps, fill them before making decisions from the нәтиже.

CSV енгізу format

The parser accepts comma, semicolon, or tab-delimited files and also tolerates decimal commas.

  • `date` is required. Accept `tmean`, or `tmin/tmax`, or `gdd`.
  • The parser auto-detects `comma`, `semicolon`, or `tab` delimiters.
  • Decimal values can be written as `12.5` or `12,5`.
  • A `gdd` column overrides температура columns for that row.
  • `YYYY-MM-DD` is the recommended date format.

How to use

  1. енгізу the reference event and date. таңдау budbreak, full bloom, or a custom белгі.
  2. Set the температура бірлік, GDD method, base температура, and upper шек if needed.
  3. Paste CSV, upload a file, or қосу daily rows by hand.
  4. Edit the stage профиль, then review the current stage, next stage, and harvest forecast.
  5. көшіру the нәтиже or бөлісу the core баптаулар with a URL.

Үлгі жағдайлар

From budbreak to the current stage

Енгізу Reference date 2026-03-15, Celsius, base temperature 10°C, daily mean CSV, stage table: Budbreak 0 / Green tip 80 / Full bloom 160 / Petal fall 240 / Fruit set 320 / Harvest 500

Нәтиже Cumulative GDD 400.0 °C·day, current stage Fruit set, harvest forecast 2026-04-08

From full bloom to a harvest forecast

Енгізу Reference date 2026-04-08, Fahrenheit, base temperature 50°F, upper threshold 86°F, semicolon CSV, forecast from the last 7 days

Нәтиже Cumulative GDD 286.0 °F·day, current stage Petal fall, harvest forecast 2026-07-02

Formulas

  • Daily GDD = max(0, min(input temperature, upper threshold) - base temperature)
  • Daily GDD = max(0, ((clipped Tmin + clipped Tmax) / 2) - base temperature)
  • Cumulative GDD = sum of daily GDD
  • Days to the next stage = next threshold - current cumulative GDD
  • Harvest forecast date = latest date + ceil(remaining GDD / recent average GDD)

Глоссарий

GDD

Growing degree days, or the accumulated effective heat used for growth models.

Base температура

Heat below this шек does not count toward GDD.

Upper шек

A cap that prevents unusually hot days from contributing too much.

Reference event

The starting point for accumulation, such as budbreak or full bloom.

Growth stage

A milestone tied to a GDD шек.

Forecast window

The number of соңғы days used to estimate future progress.

Frequently asked questions

Do I need a weather API?

No. CSV or қолмен енгізу is enough.

Can I use semicolon CSV from Excel?

Yes. Delimiters are auto-detected and decimal commas are accepted.

Should I use budbreak or full bloom?

таңдау the reference your сорт модель uses. You can rename it freely.

How is the harvest forecast calculated?

The remaining GDD to the harvest шек is divided by the соңғы daily GDD average.

Are the шектер бекітілген?

No. The template мәндер are only examples and should be edited for your сорт and region.

Stage template

  • жүктеу the generic бақ template first, then edit it for your сорт and region.
  • The stage names are editable. сақтау the шек мәндер in ascending order.
  • Use `role=harvest` for the final row when you want the harvest forecast to stop there.