Twelve series were worked in triplicate and received manganese sulphate in varying quantities, equivalent to 0–55 kgm.
On repeating the weighings there was now a decrease on the right when a kgm.
As also obtained an increase of one-third in produce of grain when 25 kgm.
The increase in both respects was evident all through the series from 10 to 55 kgm.
Mn2O3 per hectare, while it was approached very closely by that from the plot with 25 kgm.
The harvest of grain was greatest in those plots that had received 30 kgm.
The scale pans were removed, and from the two arms were hung lead spheres each weighing about 20 kgm.