50.1 MB (50.0 MB compressed)
5067 x 3456 pixels
42.9 x 29.2 cm ⏐ 16.9 x 11.5 in (300dpi)
MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Soil pH test kit. Commercial pH test kit that is designed to be used to test the acidity or alkalinity of garden soils. This is the Rapitest pH test kit, which requires the soil and a gel-activator capsule (some at lower right, green) to be mixed in water in the container. The colour of the water is then compared to the colour chart on the container to assess alkalinity or acidity. This allows a gardener to decide what plants to grow in the soil, or whether to change the pH of the soil.
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