Nutrient Sufficiency Range of Grape Petioles(Taken in September from Mature Vines)
Variety	N	P	K*	Ca	Mg		Fe	B	Zn	Mn
	Percent (%)						Parts per Million (ppm)
Vinifera	0.8-1.4	0.15-0.40	1.2-2.3	1.0-3.0	0.6-1.50		15-100	20-60	15-100	20-200
Fredonia	0.6-1.2	0.15-0.40	0.8-1.8	1.0-3.0	0.6-1.50		15-100	20-60	15-100	20-200
Other	0.7-1.3	0.15-0.40	1.0-2.0	1.0-3.0	0.6-1.50		15-100	20-60	15-100	20-200
* Potassium levels will be higher in grapes grown on sandy loam soils.