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26 Cards in this Set
- Front
- Back
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Give three advantages of using a liquid fertilizer over a dry fertilizer. |
- gives a steady, even supply of nutrients - Efficient application through fertigation (ebb and flood, trickle drip system) - Allows for better control of individual nutrients |
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Dry fertilizer requires time to _______ and make nutrients available to plants. This makes for _______ availability of nutrients to the plants |
- break down - uneven |
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PPM stands for .... |
Parts Per Million |
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PPM is given in terms of N, P, or K? |
N for Nitrogen! |
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Why do we primarily focus on the Nitrogen content in a fertilizer? |
Because it can 'burn' plant roots. We keep track of N because it has the greatest potential for damage |
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A typical fertilizer blend would consist of how much N - P - K ? |
20 - 20 - 20 |
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What is the percentage of Nitrogen in a 20-20-20 fertilizer? |
20% Nitrogen |
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Electrical Conductivity is the measure of _________ |
soil salinity (how much salt is in the soil) |
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How do we take an electrical conductivity sample? |
measure liquid squeezed from saturated soil from the bottom of several sample pots. |
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These plants see a 10% growth reduction at which corresponding salt levels? Azalea? African Violet? Chrysanthemums? Poinsettias? |
Azalea - 1 African Violet - 1.5 Chrysanthemums - 2 Poinsettias - 2.5 |
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Order the following fertilizers from highest to least salt content. limestone, super phosphate, gypsum, potassium chloride, calcium nitrate *refer to pg 72 |
- Potassium Chloride - 116 - Calcium Nitrate - 53 - Super Phosphate - 10 - Gypsum - 8 - Limestone - 5 *You don't need to memorize the numbers, just the relational order |
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What is a pre mixed working solution? |
A solution that can be directly applied to the plants. - the container of lemonade that is ready to drink vs the frozen concentrate that you have to turn into juice |
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what are the advantages of using a premixed working solution? |
- can be warmed to room temp - can be directly applied |
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what is the main disadvantage of using a premixed working solution? |
requires a large storage tank |
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what are fertilizer injectors (diluters) used for ? |
dilutes a concentrated stock solution to produce a weaker working solution |
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what are the advantages of using an injector? |
- accuracy of individual nutrients needed - doesn't require large storage tank |
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what is the main disadvantage of using an injector (dilutor) system? |
- can't recycle the fertilizer solution |
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a 1:100 injector ratio refers to stock solution and working solution in what way? |
1 litre of stock solution is being picked up for every 100 litres of working solution produced. *refer to pg 69 |
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which solution is more concetrated (stronger): 1:100 solution, or 1:200 solution? |
the 1:100 solution is more concentrated, assuming that the stock solution is the same for both |
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True or False? The stock solution container is smaller for a 1:200 solution vs a 1:100 solution because it requires less stock solution to create the same amount of working solution |
True! |
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The amount of fertilizer in a working solution is determined by what two things? |
- the injector ratio - the stock solution |
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Higher or lower concentrations of stock solution may result in a saturated solution? *Like sugar in the bottom of a tea cup |
Higher concentrations |
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what type of injector (dilutor) system is most common for home/hobby GHs? and what dilution ratio does it produce? |
- Venturi System - 1:15 |
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The dilution ratio of an injector system may be changed by ____________ |
changes in the water pressure |
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A Positive Displacement system is more or less accurate than a Venturi system? |
more accurate |
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a positive displacement system can measure up to what dilution ratio of stock solution to working solution produced? |
1:400 |
