Crops in this Family: Pecan, Walnut, Hickory, Butternut
Below is a tissue nutrient sufficiency table for the Walnut Family (Juglandaceae), primarily based on walnut (Juglans regia), as it is the most agriculturally significant member of the family. This table provides macro- and micronutrient sufficiency ranges, leaf water content (LWC), and Brix values across key growth stages. The values are derived from available research on walnut nutrition, including studies from the University of California, Purdue University, and other horticultural sources, adjusted for Juglandaceae physiology.
Growth stages are defined as:
- Vegetative (bud break to pre-bloom)
- Flowering (bloom initiation)
- Fruit Set (nut formation to shell hardening
- Fruit Maturation (kernel fill to harvest)
- Harvest
Nutrient concentrations are in percentages (%) for macronutrients and parts per million (ppm) for micronutrients, with LWC as a percentage of fresh weight and Brix (°Bx) as soluble solids in leaf sap.
Growth Stage |
N (%) |
P (%) |
K (%) |
Mg (%) |
Ca (%) |
S (%) |
||||||
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
|
Vegetative |
2.20 |
3.00 |
0.10 |
0.20 |
1.00 |
2.00 |
0.20 |
0.40 |
1.00 |
2.00 |
0.10 |
0.20 |
Flowering |
2.00 |
2.80 |
0.10 |
0.20 |
1.00 |
2.00 |
0.20 |
0.40 |
1.20 |
2.20 |
0.10 |
0.20 |
Fruit Set |
1.80 |
2.60 |
0.08 |
0.18 |
1.20 |
2.20 |
0.20 |
0.40 |
1.20 |
2.20 |
0.10 |
0.20 |
Fruit Maturation |
1.60 |
2.40 |
0.08 |
0.18 |
1.20 |
2.20 |
0.20 |
0.40 |
1.00 |
2.00 |
0.10 |
0.20 |
Harvest |
1.50 |
2.00 |
0.08 |
0.18 |
1.00 |
2.00 |
0.20 |
0.40 |
1.00 |
2.00 |
0.10 |
0.20 |
B (ppm) |
Zn (ppm) |
Mn (ppm) |
Fe (ppm) |
Cu (ppm) |
Mo (ppm) |
|||||||
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
|
Vegetative |
20 |
50 |
20 |
50 |
20 |
150 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Flowering |
25 |
60 |
20 |
50 |
20 |
150 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Fruit Set |
25 |
70 |
20 |
50 |
20 |
150 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Fruit Maturation |
20 |
50 |
20 |
50 |
20 |
150 |
50 |
150 |
5 |
15 |
0.10 |
1.00 |
Harvest |
20 |
40 |
15 |
40 |
15 |
125 |
40 |
120 |
4 |
10 |
0.10 |
1.00 |
LWC |
BRIX |
|||||||||||
Min |
Max |
Min |
Max |
|||||||||
Vegetative |
80 |
85 |
8 |
12 |
||||||||
Flowering |
78 |
83 |
10 |
14 |
||||||||
Fruit Set |
77 |
82 |
12 |
16 |
||||||||
Fruit Maturation |
75 |
80 |
8 |
12 |
||||||||
Harvest |
70 |
75 |
8 |
10 |
Scanning Recommendation:
- Ensure that over 25% of the scan bed is covered with a single layer of vegetation.
- Leaf selection should be similar to this illustration.