HOME

HELP

FEEDBACK

QUICK SEARCH:

	Author:		Keyword(s):
Year:		Vol:		Page:

	Help viewing high resolution images
	Return to article

Click on image to view larger version.

Fig. 4. Levels of 1 M NH₄–extractable K in the surface layer of a California cotton soil incubated for 7 d following addition of four K rates and the (a) mobile humic acid (MHA) fraction or (b) calcium humate (CaHA) fraction. The humic acid subscript is the amount of humic acid added (g kg^–1 soil). Standard error bars are smaller than the data points if not visible. Redrawn from Olk and Cassman (1995).