Fertilizer.si
AI agronomist for fertilizer and soil health
Get NPK ratios right, read your soil test like a pro, and time applications for crops or lawns - practical agronomy guidance grounded in soil science.
No card required · $9/mo Plus · $99/mo Premium
What you get
Everything Fertilizer.si gives you
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NPK explained
What nitrogen, phosphorus, and potassium ratios actually do.
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Soil test reader
Make sense of your soil test results and what they mean for you.
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Application timing
When and how much to apply for crops, gardens, and lawns.
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Saved conversation history
Sign in free and keep your growing notes season to season.
Pricing
Simple plans that grow with you
Most popular
Plus
$9/mo
- ✓200 questions per day
- ✓Full saved conversation history
- ✓Extended soil-test breakdowns
Premium
$99/mo
- ✓Unlimited questions
- ✓Deep-dive seasonal planning sessions
- ✓Everything in Plus