MAXINE ADCOCK / SCIENCE PHOTO LIBRARY MAXINE ADCOCK / SCIENCE PHOTO LIBRARY
Gardener using potash fertiliser on onion plants. Potash is the generic name for several inorganic crystalline plant fertilisers containing potassium (K). Potassium helps water regulation in plants and plays an important part in the formation of starch and sugars. It also helps to counterbalance an excess of nitrogen in soil.
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