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A traditional structure for the storage of vegetables. A clamp consists of a pile of the vegetables, layered with straw and soil to protect it from frost and rain. Ventilation holes are plugged with loose straw to prevent the build-up of carbon

The washing out, usually by rain, of soluble (and some insoluble) minerals from the soil. Because some substances leach faster than others, this may cause a chemical imbalance in the soil, which, in turn, may have a detrimental effect on plants

or rolling, or following heavy rain.