Turf Stress Index - Agronomy+

Turf Stress Index

Returns a daily composite stress score (0-100) that combines the growing-condition index with the day's peak disease or weed germination risk, up to 16 days ahead.

How It Works

stress_index blends the growing-condition index (temperature and humidity suitability) with the highest active disease or weed risk for that day into a single number.

• 0 means ideal: good growing conditions and no disease pressure.
• 100 means maximum stress: extreme heat or drought combined with high disease risk.

Pass turf_type=warm to use the warm-season growing-condition index in the blend; see the GDD endpoint for details on how turf_type changes that calculation.

Use Cases

• Identify days when turf recovery will be slow (stress above 60).
• Schedule irrigation, fungicide, and growth regulator applications around low-stress windows.
• Alert customers ahead of high-stress periods.

Example Request

GET /agronomy/stress/?lat=33.47&lon=-82.01

curl -X GET "https://example.com/agronomy/stress/?lat=33.4735&lon=-82.0105&turf_type=cool"

{  "lat": 33.4735,  "lon": -82.0105,  "days": [    "2026-06-07",    "2026-06-08",    "2026-06-09"  ],  "stress_index": [    38.2,    51.6,    64.4  ]}