Nuts other than Pecan
Critical Nutrient Levels for Nut Crops1,5
|
Nut
|
|
%
N2
|
%
K3
|
%
Mg
|
%
Ca
|
%
Cl4
|
%
Na4
|
ppm
Mn
|
ppm
B
|
ppm
Zn
|
ppm
Cu
|
| Almond |
Optimal |
2.1-2.6
|
1.4
|
0.25
|
2.0
|
0.3
|
0.25
|
20
|
*
|
|
4
|
|
Def. |
2.0
|
1.0
|
|
|
|
|
|
|
15
|
|
| Pistachio |
Optimal |
2.5-2.9
|
1.0-2.0
|
1.2
|
1.3
|
0.1-0.3
|
?
|
30-80
|
120-250
|
10-15
|
6-10
|
|
Def. |
2.3
|
1.0
|
|
|
|
|
|
90
|
7
|
|
| Walnut |
Optimal |
2.2-3.2
|
1.2
|
0.3
|
1.0
|
0.3
|
0.1
|
20
|
36-200
|
|
4
|
|
Def. |
2.1
|
0.9
|
|
|
|
|
|
20
|
18
|
|
Source of information: In-A-Nutshell, June 1999, p7.
Def. = Deficiency
* For boron status, sample hulls at harvest (30-80 ppm in hulls is
deficient; 80-200 ppm is sufficient; >200 ppm is excessive).
Data is for July leaf samples for Almonds and Walnuts and for August
leaf samples for Pistachios.
-
Leaves are from spurs (fruiting & nonfruiting) on spur-bearing trees
(almond) and terminal leaflet on walnut and pistachio.
-
Percent nitrogen in August and September samples can be 0.2-0.3 lower than
July samples and still be equivalent.
-
K levels between deficient and adequate are considered "low."
-
Excess Na or Cl causes reduced growth at levels shown. Leaf burn
may or may not occur when levels are higher.
-
Phosphorus levels should not be allowed to go below 0.1%. Usually
pistachio is 0.14 - 0.17%.