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Leaf analysis standards
Sample: 50 recently-matured leaves with petiols
Timing: initial flowering
Excess
Normal
Deficiency
Nutrient
>4%
3-4%
2.3-2.49%
N
>0.5%
0.3-0.5%
0.2-0.29%
P
>3.5%
2.5-3.5%
1-1.49%
K
>1.5%
0.5-1%
0.6-0.79%
Ca
>0.4%
0.3-0.4%
0.25-0.29%
Mg
>0.6%
0.3-0.6%
<0.29%
S
>50 ppm
50 ppm
<50 ppm
Fe
Mn
>20 ppm
20 ppm
<20 ppm
Zn
>7 ppm
7 ppm
<7 ppm
Cu
30-50 ppm
B
Nutrients consumption dynamics of blackberries
K application rates
General guidelines for K application by fertigation
Multi-K Kg/ha
Recommended rate ( K2O kg/ha)
Share of K2O at stage (%)
Stage
65
30
15
Leaf emerence
87
40
20
Flowering
109
50
25
Fruit set
Fruit growth
Fruit maturation
435
200
100
N deficiency
Deficiency symptoms
Nutritional requirements
Estimated yield
(ton/ha)
kg/ha
g/ha
5
29
6
34
11
12
86
191
41
60
10
57
68
21
24
171
382
81
120
18
102
32
44
35
257
573
122
180
114
136
42
59
47
342
80
764
161
240
N, P and K demand throughout the season, blackberry var. Tupi under intensive production (Oseguera and Sánchez, Mexico, 2015)
Growth stage
Nitrogen
phosphorus
Potassium
---------------------- % -----------------------
Vegetative - before defoliation
16
After defoliation - sprouting
23
22
Sprouting - flowring
4
26
flowring - fructification
55
Total