Experiments on the value of greensand as a source of potassium for plant culture
By: By R. H. True and Fred W. Geise
Publisher: Government Printing Office
Published: 1918
Place of publication: Washington
Language: eng
Number of pages: 492
Notes: Reprinted from Journal of Agricultural Research, v. 15, p. 483-492, pl. 33,34, 1918.