[148] [See table, chapter 19, p. 256].
[149] In the light alkali lands of the southern California Experiment Substation at Chino, the average content of water-soluble potash in ten acres amounts to the equivalent of 1,200 pounds of potash sulphate per acre. Outside of this the acid-soluble potash of the soil is .95%., equal to 38,000 pounds per acre-foot.
[150] Samoa Erkundung, by F. Wohltmann, Kolonial-Wirthsch. Komitee, Berlin, 1904.
[151] Wohltmann states that the hot extraction sometimes yielded as much as five times more than the cold; but no such case appears in his reports on Samoa and Kamerun.
[152] The numbers in brackets are determinations made after boiling with acid for one hour.
[153] Soil air-dry.
[154] The numbers in brackets are determinations made after boiling with acid for one hour.
[155] Annales de la Science Agronomique, tome 1er, 1901, fasicules 1, 2, 3.
[156] On the Composition of Indian Soils. Agr. Ledger, 1898, No. 2.
[157] Analysis by Voelcker.