Figure 1. Antagonism of potassium and silicon contents (percent of ash) in the roots (A) and synergism in the fruits and grains (B). Crushed granite. Check experiment. ? - tomato, trend —— ; ? - wheat, trend – · – ·. Zeolite: × - tomato, trend - - - . Here and below: for crushed granite we give data just for the odd vegetation periods; for zeolite we give results of an experiment for vegetation periods from the first to the twelfth.