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Standard adequacy ranges for foliar nutrient contents of some essential elements for tree fruits (after Shear and Faust, 1980)
| Element |
Crop |
Desired level |
| Nitrogen |
Young, nonbearing apples and pears |
2.4-2.6% |
| |
Young, bearing apples and pears |
2.2-2.4% |
| |
Mature soft apples and pears |
1.8-2.2% |
| |
Mature hard apples and processing |
2.2-2.4% |
| |
Cherries, plums, prunes |
2.4-3.4% |
| |
Peaches |
3.0-4.0% |
| Phosphorus |
Apple |
0.11-0.3% |
| |
Stone fruit |
0.12-0.4% |
| Potassium |
Apple |
1.2-2.0% |
| |
Stone fruit |
1.0-3.0% |
| Calcium |
Apple |
1.5-2.0% |
| |
Stone fruit |
0.7-3.7% |
| Magnesium |
Apples |
0.2-3.5% |
| |
Stone fruits |
0.25-1.0% |
| Manganese |
Apples |
25-150 ppm |
| |
Stone fruits |
20-300 ppm |
| Boron |
Apples and pears |
20-50 ppm |
| |
Stone fruits |
20-80 ppm |
| Zinc |
Apples |
15-200 ppm |
| |
Stone fruits |
12-75 ppm |
| Copper |
Apples |
5-20 ppm |
| |
Stone fruits |
6-25 ppm |
| Iron |
Apples |
40-400 ppm |
| |
Stone fruits |
20-800 ppm |
Nutrients mobile in plant
(deficiency symptoms show first on older growth) |
Nutrients not remobilized (in general) in plants
(deficiency symptoms show first on new growth) |
| N, P, K, Mg, Mo, and Na |
Ca, B, Cu, Fe, Mn, Cl, and Zn, and S (slightly mobile) |
Updated
July 12, 2004
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