Description
The Luster Leaf® Rapitest® Soil Test Kit gives you a complete picture of what’s in your soil — testing pH, nitrogen, phosphorus, and potassium (potash) using color-coded chemical comparators that deliver accurate results without batteries, digital displays, or any special equipment. Know what your soil actually has before you fertilize, and amend with confidence rather than guessing. Includes a reference chart for over 100 plants showing ideal pH and NPK levels, plus instructions for correcting whatever your tests reveal. A total of 40 tests included — 10 each for pH, nitrogen, phosphorus, and potassium.
Test First, Amend With Confidence
The most common fertilizing mistake is applying what you think your plants need rather than what they actually lack. Too much nitrogen produces lush foliage and poor fruiting. Wrong pH locks out nutrients that are already present. The Rapitest® Soil Test Kit eliminates that guesswork — four color-coded tests for pH, nitrogen, phosphorus, and potassium tell you exactly what your soil has and what it needs before you spend money on fertilizer or amendments.
100+ Plant Reference Chart — Ideal Levels for Your Specific Plants
What makes the Rapitest® kit particularly useful is the included reference chart covering over 100 plant species with their ideal pH and NPK ranges. Rather than just knowing your soil’s numbers, you can compare them directly against what your specific fruit trees, berry plants, vegetables, or ornamentals actually need — and identify the gap. Soil amendment instructions are included to guide you through correcting whatever the tests reveal.
How It Works — Color-Coded Comparators
Each of the four tests uses color-coded capsules matched to removable film color comparators — mix the capsule contents with your soil sample and water per the instructions, let the color develop, and compare against the film chart. No batteries, no digital reading, no calibration required. The color-coded tops and capsules ensure you’re using the right test for each nutrient without confusion.
Why Growers Choose the Rapitest® Soil Test Kit
- Tests pH, nitrogen, phosphorus, and potassium — the four factors that determine plant health
- 40 total tests included — 10 each for comprehensive seasonal testing across multiple garden beds
- 100+ plant reference chart — compare your results directly against your specific plants' needs
- Soil amendment instructions included — know what to do with the results
- No batteries or equipment required — simple color-comparator chemistry
- Avoids over- and under-feeding — the most practical return on any garden investment
