Means of K (mg kg-1) for each soil.

Depth (cm)	Begining of the study		End of the study
Depth (cm)	GW	TWW	GW	TWW
0-20	270a*	260a*	170a*	170a*
20-40	220ab*	230ab*	200a	160a
40-60	160b*	160b*	190a	150a
60-80	90c*	90c*	160a	120a
80-100	70c*	70c*	130a	60b

Data in the same column followed by the same letter (a, c) were not significantly different at the P < 0.05 level (Test of Newman-Keuls), and (*) indicates that there is no significant difference (P < 0.05) between GW soil and TWW soil.

Table 7: Means of K (mg kg-1) for each soil layer at the beginning and the end of the study.

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