Nutrient Sufficiency Range - Ontario AppleIPM

Foliar Nutrient Sufficiency Range of Apple (Mid-Shoot Leaves Taken in Last Two Weeks of July from Mature Trees)
Variety	N*	P	K	Ca	Mg	Fe	B	Zn	Mn
Variety	Percent (%)					Parts per Million (ppm)
Delicious, Crispin	2.2-2.7	0.15-0.40	1.4-2.2	0.8-1.5	0.25-0.40	25-200	20-60	15-100	20-200
Empire, Spy	2.1-2.6	0.15-0.40	1.3-2.1	0.7-1.5	0.25-0.40	25-200	20-60	15-100	20-200
McIntosh, other	2.0-2.5	0.15-0.40	1.2-2.0	0.8-1.5	0.25-0.40	25-200	20-60	15-100	20-200
*Leaf nitrogen in non-bearing trees should be 0.2% higher. Leaf nitrogen on M.9 or M.26 rootstocks should be 0.2% higher.