Investigate six important factors for the health of soil as it relates to plant nutrition. Includes enough materials to conduct 100 tests of nitrogen, phosphorus, potassium and pH levels, a pH/temperature tester, a conductivity/temperature tester, and a long-stem soil thermometer. All materials fit in the supplied backpack. 48-page teacher’s guide containing real-world examples and vocabulary terms, detailed lab activities, laminated field test cards, and summary transparencies for each parameter are included in this Hanna Backpack Lab.