Soil type: light to medium, good drainage, pH 6.5 - 8.
Annual irrigation rate: ~6,000 m3/ha.
Plant Population: 400-600 trees/ha.
Expected yield: 45 t/ha.
Fertigation: Recommended rates of nutrients and fertilizers
Month |
Crop requirements (kg/ha) |
Recommended Fertilizers (kg/ha) |
||||||
---|---|---|---|---|---|---|---|---|
N |
P2O5 |
K2O |
MgO |
Multi-K |
MAP |
AN |
Magnisal |
|
March |
15 |
10 |
20 |
0 |
44 |
16 |
22 |
0 |
April |
20 |
15 |
30 |
5 |
65 |
25 |
14 |
32 |
May |
32 |
20 |
40 |
5 |
87 |
33 |
0 |
32 |
June |
35 |
10 |
40 |
10 |
87 |
16 |
45 |
63 |
July |
20 |
5 |
35 |
10 |
76 |
8 |
7 |
63 |
August |
6 |
0 |
5 |
8 |
11 |
0 |
0 |
51 |
September |
6 |
5 |
5 |
5 |
11 |
8 |
0 |
32 |
October |
10 |
5 |
10 |
0 |
22 |
8 |
18 |
0 |
Total annual |
140 |
70 |
185 |
45 |
403 |
114 |
106 |
273 |
MAP – mono-ammonium phosphate (0-61-0)
Amm. Nit – Ammonium Nitrate (34-0-0)
Magnisal – Magnesium nitrate (10.8-0-0-15.8)
A general guideline for splitting K application
Growth stage |
Share of K2O at stage (%) |
Recommended rate (kg/ha of K2O) |
---|---|---|
Leaf emergence |
15 |
23 |
Flowering |
20 |
30 |
Fruit-set |
25 |
37 |
Fruit growth |
25 |
37 |
Fruit maturation |
15 |
23 |
Total |
100 |
150 |
Foliar feeding
Fall is an excellent season to prepare the tree to next season requirements in N, K and Fe. As long as foliage is green and active it will readily absorb these nutrients applied by foliar sprays.Macro elements removed by 1 ton marketable product
N |
P |
K |
Ca |
Mg |
S |
---|---|---|---|---|---|
-------------------------------------- Kg/ton ------------------------------------------ |
|||||
0.6 |
0.7 |
1.3 |
0.9 |
Sufficient nutrient range of apples*
Element |
Nutrient range (%) |
Element |
Nutrient range (ppm) |
---|---|---|---|
N |
1.9-2.4 |
Mn |
31-150 |
P |
0.17-0.28 |
Fe |
35-150 |
K |
1.2-1.8 |
B |
28-50 |
Ca |
1.3-1.7 |
Cu |
5-10 |
Mg |
0.24-0.36 |
Mo |
0.5-1.5 |
Zn |
20-50 |
Source: Fertilizing Fruit Crops – Ohio Cooperative Extension Service, The Ohio state University p. 11.
Apples – Mineral analysis values
Mature leaves |
||
---|---|---|
Nutrient |
Average value |
Critical level |
(%) |
||
N |
2.30 |
1.70 |
S |
0.19 |
0.08 |
P |
0.30 |
0.18 |
K |
2.00 |
1.20 |
Mg |
0.40 |
0.25 |
Ca |
2.00 |
1.30 |
Na |
0.02 |
|
(ppm) |
||
Fe |
90 |
15 |
Al |
40 |
|
Mn |
140 |
35 |
B |
60 |
35 |
Cu |
20 |
5 |
Zn |
60 |
20 |
Mo |
0.8 |
0.05 |
Plant analysis guide
Apples |
N |
S |
P |
K |
Mg |
Ca |
Na |
B |
Zn |
Mn |
Fe |
Cu |
Al |
Mo |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
------------------------ % ------------------------- |
--------------- p.p.m --------------- |
|||||||||||||
From |
1.75 |
0.15 |
0.15 |
1.20 |
0.20 |
1.00 |
0.01 |
25 |
15 |
30 |
100 |
6 |
||
To |
2.75 |
0.30 |
0.40 |
2.00 |
0.35 |
1.60 |
0.15 |
50 |
60 |
180 |
200 |
25 |
|
Plant tissue sampling procedures:
Stage of growth | Plant part |
---|---|
Five to eight weeks after full bloom | 4 to 8 leaves from spurs or near base of current season’s growth |
Base dressing recommendations (kg/hectare)
Year |
N |
P2O5 |
K2O |
CaO |
MgO |
---|---|---|---|---|---|
1st year |
48 |
48 |
36 |
48 |
6 |
2nd year |
42 |
48 |
63 |
36 |
9 |
3rd year |
50 |
60 |
90 |
40 |
12.5 |