Hydroponics Assessment

True or False? When planning to set up your hydroponic system, it is important to clean the area before you set up the system.

True, you need to remove all trees, bushes and rubbish
False, you can build the system over it

Tick the 3 characteristics that make hydroponics different from soil production.

Hydroponics need a lab analysis to determine how many of each nutrient is needed
In hydroponics soil borne diseases can be eliminated
Hydroponics cause less water stress on plants
Hydroponics always require good topsoil
In a protected environment such as a greenhouse, there are less risks to hydroponic plants

The plants in your hydroponic system is wilting, what will you check?

The power is on and the plants are getting water
The EC is not too high

Define Hydroponics

Plants growing in soil
Plants growing in water only
A system where plants are grown in growth media other than natural soil. All the nutrients are dissolved in the irrigation water and are supplied at a regular basis to plants.

What is a closed hydroponic system?

a fresh nutrient solution is introduced for each irrigation cycle. The nutrient solution is usually delivered to the plants using a drip system.
the same nutrient solution is recirculated and the nutrient concentrations are monitored and adjusted accordingly.

Tick all the following true statements:

Gravel has a very poor waterholding capacity but gives great aeration to roots and is the most cost effective.
Rockwool has a good waterholding capacity but a shorter lifespan than stone and is compactible
Pine shavings has a long life span but very poor water holding capacity

Fertigation
You have a 1000 litres in your system.
After dilution with rainwater the EC has dropped to 0.5 mS.
How much NATGROW and OMNICAL will you add to get the EC back to 2 mS.

600g Natgro and 700g Omnical
700g Omnical and 600g Natgro
525g Natgro and 450g Omnical
5.25kg Natgro and 4.5kg Omnical

What are the 3 things that you must do to ensure that your crop is disease/pest free?

Inspect your crop daily for damage or disease
Identify the pests and find the product that is least harmful to yourself and the environment according to the label
Spray the crop according to the manufacturers instructions
Respect the withholding period before harvesting the crop

Why do we calibrate EC meters?

To get accurate results
They set themselves out over time
To test the batteries

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