Potassium From the Soil

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. In 1912 two more pots were added to the series, Nos. 5 and 5a. These were filled with extracted1 quartz sand. The same plant-food materials were added to these pots as were originally applied in pow dered form to Po...