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The 70-day type on a fertiliser bag assumes 25°C. In a cool spring the same product lasts 117 days. In midsummer it is gone in 58. FertClock uses your actual temperatures to show how much fertiliser is left.

No. All calculations happen on your device. Location is optional and used only to fetch weather, not stored.

Yes, except for weather forecast. You can type temperatures in by hand if you prefer.

It does not select products, diagnose soil, or predict yield. The figures are a guide — your product label and local guidance come first.