If your plants are looking sickly and stunted, but no pests are evident, poor nutrition may be to blame. This NPK Test Kit tells you exactly which fertilizer you need – nitrogen, phosphorus or potassium. Kit includes bottles, caplets and color charts Box is 1-3/4" L x 1/2" D x 2-3/4" H Distilled water is recommended for testing
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$19.95
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