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2009 catalogue
Liquid Feed Guidelines For Tomatoes

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 NITRATE105.0 kg105.0 kg100.0 kg95.0 kg
POTASSIUM NITRATE15.0 kg5.0 kg10.0 kg15.0 kg
AMMONIUM NITRATE2.0 kg2.0 kg2.0 kg1.0 kg
IRON CHELATES –EDTA 13%800 g800 g800 g800 g
 
SOLUTION B
POTASSIUM CHLORIDE (WSM)25.0 kg25.0 kg25.0 kg25.0 kg
POTASSIUM SULPHATE30.0 kg28.0 kg28.0 kg30.0 kg
MONO POTASSIUM PHOSPHATE13.0 kg13.0 kg14.0 kg16.0 kg
MONO AMMONIUM PHOSPHATE4.0 kg4.0 kg3.0 kg2.0 kg
PHOSPHORIC ACID – 81%As requiredAs reqAs reqAs req
MAGNESIUM SULPHATE (Epsom)65.0 kg50.0 kg52.0 kg55.0 kg
MANGANESE SULPHATE - 32%Mn180 g180 g180 g180 g
ZINC SULPHATE –23%Zn140 g140 g140 g140 g
BORAX -11%B330 g290 g290 g290 g
COPPER SULPHATE –25%Cu24 g24 g24 g24 g
SODIUM MOLYBDATE-40%Mo12 g12 g12 g12 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-nitrate186173g171169
Nitrogen-nitrate186173171169
Nitrogen-ammonium8874
Phosphorus47414143
Potassium298300322356
Calcium197197188179
Magnesium65505255
Sulphur140117120126
Chloride122122122122
Iron1.051.051.051.05
Manganese0.580.580.580.58
Zinc0.320.320.320.32
Boron0.370.330.330.33
Copper0.060.060.060.06
Molybdenum:0.050.050.050.05
K/N ratio1.54:11.66:11.81:12.06:1

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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