How quickly to define acidity of the soil on a site? \u000d\u000a3-4 leaves of blackcurrant or a bird cherry and to make them in a glass of abrupt boiled water. To cool and filter. To lower in this water a soil piece from a site. If water is red - the soil sour. If greenish - subacidic. The bluish shade of water in a glass will indicate neutral reaction of the soil.