Nitty Gritty Soil Science Kit Discover the importance of composting - even develop an eye for an earthworm - with this interesting introductory kit. You'll learn what healthy plants require in terms of soil texture, pH levels and nutrients while performing tests using non-hazardous TestTab reagent tablets. We provide instructions and materials to perform 10 tests each of pH, Nitrate, Phosphate and Potassium. Qty :