Fertiliser Quantities for Greenhouse Tomato 100 x Concentrate Stock
Solution Run To Waste Galuku Cocopeat Growbags (kg/1000 L water)
|
SATURATION |
STARTER 0-5 weeks |
STARTER 5-8 weeks |
STANDARD to end |
|
SOLUTION A |
CALCIUM NITRATE | 105.0 kg | 105.0 kg | 100.0 kg | 95.0 kg |
POTASSIUM NITRATE | 15.0 kg | 5.0 kg | 10.0 kg | 15.0 kg |
AMMONIUM NITRATE | 2.0 kg | 2.0 kg | 2.0 kg | 1.0 kg |
IRON CHELATES EDTA 13% | 800 g | 800 g | 800 g | 800 g |
|
SOLUTION B |
POTASSIUM CHLORIDE (WSM) | 25.0 kg | 25.0 kg | 25.0 kg | 25.0 kg |
POTASSIUM SULPHATE | 30.0 kg | 28.0 kg | 28.0 kg | 30.0 kg |
MONO POTASSIUM PHOSPHATE | 13.0 kg | 13.0 kg | 14.0 kg | 16.0 kg |
MONO AMMONIUM PHOSPHATE | 4.0 kg | 4.0 kg | 3.0 kg | 2.0 kg |
PHOSPHORIC ACID 81% | As required | As req | As req | As req |
MAGNESIUM SULPHATE (Epsom) | 65.0 kg | 50.0 kg | 52.0 kg | 55.0 kg |
MANGANESE SULPHATE - 32%Mn | 180 g | 180 g | 180 g | 180 g |
ZINC SULPHATE 23%Zn | 140 g | 140 g | 140 g | 140 g |
BORAX -11%B | 330 g | 290 g | 290 g | 290 g |
COPPER SULPHATE 25%Cu | 24 g | 24 g | 24 g | 24 g |
SODIUM MOLYBDATE-40%Mo | 12 g | 12 g | 12 g | 12 g |
From the above formulas, the typical nutrient element composition is outlined
below when assuming standard element concentrations for each fertilizer and
dilutions as outlined above.
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SATURATION |
STARTER 0-5 weeks |
STARTER 5-8 weeks |
STANDARD to end |
Nitrogen-nitrate | 186 | 173g | 171 | 169 |
Nitrogen-nitrate | 186 | 173 | 171 | 169 |
Nitrogen-ammonium | 8 | 8 | 7 | 4 |
Phosphorus | 47 | 41 | 41 | 43 |
Potassium | 298 | 300 | 322 | 356 |
Calcium | 197 | 197 | 188 | 179 |
Magnesium | 65 | 50 | 52 | 55 |
Sulphur | 140 | 117 | 120 | 126 |
Chloride | 122 | 122 | 122 | 122 |
Iron | 1.05 | 1.05 | 1.05 | 1.05 |
Manganese | 0.58 | 0.58 | 0.58 | 0.58 |
Zinc | 0.32 | 0.32 | 0.32 | 0.32 |
Boron | 0.37 | 0.33 | 0.33 | 0.33 |
Copper | 0.06 | 0.06 | 0.06 | 0.06 |
Molybdenum: | 0.05 | 0.05 | 0.05 | 0.05 |
K/N ratio | 1.54:1 | 1.66:1 | 1.81:1 | 2.06:1 |
Notes Guidelines for use:
The four formulas are designed for the individual phases of plant growth.
The saturation solution is designed for new growing media and application
prior to planting to charge the root zone environment.
The two starter solutions are designed for pre-flowering to second or third
truss flowering phase (0-5 weeks) and then fruit filling phase (5 to 8
weeks).
The standard solution should be used for the rest of the cropping phase.
With a heavy fruit load, reduce Calcium Nitrate to 90.0 kg and increase
Potassium Nitrate to 30.0 kg and raise Magnesium Sulphate to 60.0 kg at
2 weeks prior to picking for the first two trusses.
Thereafter, revert back to the standard solution but also rely on analysis to
determine the most suitable management.
In all cases, run off solution and leaf analysis should be conducted to
determine optimal nutritional management of the plants. It is advised to
conduct this on a regular basis to identify trends in the nutritional uptake.
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Electrical Conductivity
The electrical conductivity supplied in the drip water will depend on the
phase of growth, environmental conditions, crop performance, fruit load,
varietal requirements etc.
The electrical conductivity of the drip water must be controlled by the
grower. In hot weather, high light conditions, weak or highly generative
growth use a lower electrical conductivity. With low light, cool weather,
soft growth use a higher electrical conductivity.
In general, run off from the bags should be measured and recorded.
Electrical conductivity readings of 2.5 to 4.5 dS/m in run off are acceptable
under certain conditions. Avoid high and low electrical conductivity
readings for extended periods unless conditions warrant them.
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pH
The pH of the drip water should be applied at 5.5 to 6.5. The run off
should be maintained at 5.8 to 6.5. If the pH is higher in the drip and run
off, Phosphoric Acid 81% should be added to the B solution at 1.0 L and
then the pH monitored in the drip water and run off solution. If pH is still
high continue to add Phosphoric Acid 81% gradually until 2.0 L of acid is
used, further additions will require modifications to the feed solution
supplied to plants.
Future B solutions will need to be modified to reduce the total amount of
phosphorus supplied with 2.0 L of Phosphoric Acid 81%. For 1.0 L of
Phosphoric Acid 81%, remove 3.4 kg of Mono Potassium Phosphate and
add 2.2 kg of Potassium Sulphate.
Never use more than 6.0 L of Phosphoric Acid 81%, seek further advice on
long term pH management of the nutrient solution and run off.
Under rapid growth and nutrient uptake, the pH may rise. This can be
regulated by the addition of Ammonium Nitrate, never use any more than
1.5 kg per 1,000 L extra unless analysis confirms suitability.
When modifying the pH and electrical conductivity, make gradual changes
to achieve gradual changes to the growing media and root zone.
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Disclaimer
The information provided is given in good faith as a general guide only. Significant variation in local climate, greenhouse environment, cultural practices, variety, managerial conditions and other variables are likely to influence crop performance. No liability will be accepted by Galuku Pty Ltd or its representatives for the lack of perceived or actual performance in response to the information provided.
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