Corn, Soybean, Wheat and Alfalfa Field Guide, Bulletin 827, POTASH

Yield Potentials	ton/acre	5	6	7	8	9
Soil Test K		lb K₂O per acre³
ppm (lb/acre)	CEC	5 meq/100g
25 (50)¹		300	300	300	300	300
50 (100)		300	300	300	300	300
75 (150)		285	300	300	300	300
88 (175)²		270	300	300	300	300
110 (220)		150	175	205	230	260
130 (260)		40	50	55	65	70
140 (280)		0	0	0	0	0

	CEC	10 meq/100g
25 (50)		300	300	300	300	300
50 (100)		300	300	300	300	300
75 (150)		300	300	300	300	300
100 (200)²		270	300	300	300	300
120 (240)		160	190	220	250	280
140 (280)		55	65	75	85	95
150 (300)		0	0	0	0	0

	CEC	20 meq/100g
50 (100)		300	300	300	300	300
75 (150)		300	300	300	300	300
100 (200)		300	300	300	300	300
125 (250)²		270	300	300	300	300
145 (290)		160	190	220	250	280
165 (330)		55	65	75	85	95
175 (350)		0	0	0	0	0

	CEC	30 meq/100g
75 (150)		300	300	300	300	300
100 (200)		300	300	300	300	300
125 (250)		300	300	300	300	300
150 (300)²		270	300	300	300	300
170 (340)		160	190	220	250	280
190 (380)		55	65	75	85	95
200 (400)		0	0	0	0	0
¹ Values in parentheses are lb/acre.
² Maintenance recommendations are given for this soil test level.
³ Potash recommendations should not exceed 300 lb per acre.

POTASH (K2O) RECOMMENDATIONS FOR ALFALFA AT VARIOUS YIELD POTENTIALS, CEC'S & SOIL TEST LEVELS.