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Below is an orange (e.g., Citrus sinensis L., orange) tissue nutrient sufficiency table by growth stage, including macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium, sulfur), micronutrients (boron, copper, iron, manganese, zinc, molybdenum), leaf water content (LWC), and Brix values. These values are based on leaf tissue analysis (typically 4- to 7-month-old spring flush leaves from non-fruiting terminals, unless specified otherwise) and are derived from agricultural research, such as guidelines from the University of Florida, California Citrus Research Board, and other citrus-growing regions, adjusted for citrus physiology.
Growth stages are categorized as:
- Vegetative Growth (spring flush to pre-bloom)
- Flowering (bloom)
- Fruit Set (post-bloom to early fruit development)
- Fruit Maturation (fruit growth 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 |
2.50 |
2.80 |
0.12 |
0.16 |
1.00 |
1.50 |
0.30 |
0.60 |
2.50 |
3.50 |
0.20 |
0.30 |
|
Flowering |
2.40 |
2.70 |
0.12 |
0.16 |
1.00 |
1.50 |
0.30 |
0.60 |
2.50 |
3.50 |
0.20 |
0.30 |
|
Fruit Set |
2.40 |
2.70 |
0.10 |
0.14 |
1.20 |
1.70 |
0.30 |
0.60 |
2.50 |
3.50 |
0.20 |
0.30 |
|
Fruit Maturation |
2.20 |
2.50 |
0.10 |
0.14 |
1.20 |
1.70 |
0.30 |
0.60 |
2.50 |
3.50 |
0.20 |
0.30 |
|
Harvest |
2.00 |
2.50 |
0.10 |
0.12 |
1.00 |
1.50 |
0.30 |
0.60 |
2.00 |
3.00 |
0.10 |
0.25 |
|
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 |
25 |
100 |
25 |
100 |
25 |
100 |
60 |
120 |
5 |
16 |
0.10 |
1.00 |
|
Flowering |
25 |
100 |
25 |
100 |
25 |
100 |
60 |
120 |
5 |
16 |
0.10 |
1.00 |
|
Fruit Set |
25 |
100 |
25 |
100 |
25 |
100 |
60 |
120 |
5 |
16 |
0.10 |
1.00 |
|
25 |
100 |
25 |
100 |
25 |
100 |
60 |
120 |
5 |
16 |
0.10 |
1.00 | |
|
Harvest |
20 |
80 |
20 |
75 |
20 |
75 |
50 |
100 |
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 |
12 |
||||||||
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.
