NUTRIENT MANAGEMENT
Petiole nutrient guide
|
Nutrient |
Bud differentiation stage (BDS)
– (After
foundation pruning) |
Full bloom stage (FBS)
- (After
forward pruning) |
|
Macronutrients
|
||
|
N (%)
|
1.20 – 1.53
|
1.44 – 1.80
|
|
P (%)
|
0.387 – 0.472
|
0.283 – 0.356
|
|
K (%)
|
0.590 – 0.680*
|
1.61 – 2.95
|
|
Ca (%)
|
0.727 – 1.03
|
0.508 – 0.81
|
|
Mg (%)
|
0.877 – 1.28
|
0.579 – 0.870
|
|
Micronutrients**
|
||
|
Fe (ppm)
|
54 – 80
|
32 – 80
|
|
Mn (ppm)
|
42 – 209
|
76 – 174
|
|
Zn (ppm)
|
30 - 88
|
51 – 130
|
|
Cu (ppm)
|
5 – 10
|
5 – 10
|
|
B (ppm)
|
30 – 50
|
30 – 50
|
Even though the above mentioned petiole K content (0.59
– 0.68%) at bud differentiation stage is sufficient in soils high in
available K content, nevertheless there are chances of leaf curling, which
could affect management of disease and pests due to inadequate spray
coverage. It is therefore, advisable to maintain petiole K levels at bud
differentiation stage above 1.5%.