By James Calpas. Edmonton
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Extra info for Commercial greenhouse production in Alberta
100:1 or 200:1). 41 grams/ml • 9,080 grams of phosphoric acid Table 8. The specific gravity of 85 per cent phosphoric acid and 67 per cent nitric acid. 28 grams/ml Having the weight of the acid, it is now possible to determine the amount of phosphorus contributed to the pH-adjusted water by 85 per cent phosphoric acid. One more piece of information is required; phosphoric acid contains 32 per cent available phosphorus, which is also referred to as the fertilizer grade of the acid. 200 litres (stock tank volume) x 200 (injector ratio) = 40,000 litres Calculations in the following sections on fertilizer and water will be based on 200 litre stock tanks and a 1:200 injection ratio.
The day-to-day management of the delivery of feed to the crop can vary and is based on the salt level of the feed solution. The feed solution can be used as a management tool to direct the development of the crop towards a vegetative or generative direction. The basis for this approach is that the higher the level of salts delivered to the root zone, the more stress is placed on the plants. The more stress the plant is under, the more emphasis the plant puts on producing fruit and the less emphasis on stems and leaves.
Using the two-tank stock tank system, the fertilizer should be mixed as follows: Before mixing fertilizers, ensure that a dust mask and gloves are worn to avoid inhaling the fertilizer dusts or coming into contact with the fertilizer concentrates. Tank A TankB calcium nitrate potassium nitrate (one half the total amount) potassium nitrate (one half the total amount) magnesium sulfate iron chelate monopotassium phosphate potassium sulfate 'Die first rule in mixing fertilizers is to always use high quality, water soluble "greenhouse grade" fertilizers.
Commercial greenhouse production in Alberta by James Calpas. Edmonton