Simple and Cheap way to have a hydroponic garden

May 8, 2008

Following are our suggestions for a simple and cheap way to have a hydroponic garden.

Please do note that hydroponics works really well because the gardener
provides everything the plants need. So by cutting down to the very
basic needs for a hydroponic system we actually give the plants
a disadvantage.

Requirements

When doing a science project on hydroponics, these are the very basic things you need:

1. A garden system
2. growing medium
3. A & B nutrient
4. pH kit
5. Seeds
6. A bucket
7. Piece of water hose, attached to the bucket and to your tray

With hydroponics the gardener usually also provides the light. If you
have a grow light, use it. If you donâ€™t make sure the plants get ample sunlight. Hydroponics gardener

1. Gravity Fed System A standard 2 part nursery tray and a bucket can be easily rigged to a ‘flood & drain’ garden.
We have small deep water culture gardens available (Mini Hydro Harvest, Jack’s Little Garden) if you wish to purchase a complete hydroponic starter kit. These gardens come complete with nutrient, pH kit, growing medium, pump etc. Their prices range between $84 CDN and $112 CDN.

2. A hydroponics growing medium is completely inert. An inert medium will not effect the pH of the nutrient solution. It does not provide anything but an anchor for the plant. Hydroponic growing mediums are less compact than earth so the roots get more air.
1″ cube with cutting

Plant The growing medium we suggest for a project is â€˜Rockwoolâ€™. Get one inch / 2.5 cm starter cubes.

3. Any commercially prepared standard ‘hydroponic nutrient’ should do nicely. More information on nutrient.

4. Plants will fail if their pH is too high or low. You need something to test the pH level of your nutrient solution and pH adjusters. We sell a pH kit for approximately $13.50 CDN.

5. Try an herb such as basil, it will grow and flower quickly. Leaf lettuce is another good plant to use because we harvest before it flowers. Stay away from tomato, pepper, cucumber because they take a very long time to fruit.

Preparation

The first step is to pH balance the Rockwool starting cubes. pH refers to acid or
alkaline level of the solution. The pH scale goes from one to fourteen, with seven
being neutral. Any reading above seven is alkaline, any reading below seven is acidic.
Tap water tends to be a little on the alkaline side and since plants prefer a slightly
acidic root zone, we must add a little acid to the water we feed the plants.

Fill a one litre container with tap water. Pour about one tablespoon of the water
into a small clear container. With an eye dropper add two drops of pH indicator
solution to the water sample. Now compare the colour of the sample to the colour
chart on the bottle. It will probably be greenish (pH 7-8). Next add two or three
drops of â€˜pH Down” (phosphoric acid) to the litre of water, stir and do the test
again. Repeat this procedure until the sample turns yellow, indicating a pH of about
6.0. If the colour of the sample turns brownish or reddish, you have added too much pH
Down, so just add more tap water to raise the pH level again. Be careful not to get any
pH Down on your hands. If you do, wash immediately with water.

Set up the hydroponic systemGravity Fed System

Put the garden in the place where it will remain. It is not easy to move when it is in
use. Make sure the garden is on a sturdy, level surface where it canâ€™t be knocked over.
When mounting on a window ledge make sure the ledge is wider than the garden.

Rockwool must not sit on a flat surface, there must be an air space underneath. Prop up,
use Â½” of Perlite or a standard 2 part nursery tray.

Attach the hose to the tray and bucket.

Plant seeds

Now you are ready to soak your one inch starter cubes in the pH balanced solution and put
them on a plate or tray. It is now time to plant your seeds! Choose your seeds and insert
one seed into the small hole in the top of each cube. If there is not a pre-made hole, make
one about pencil width, a quarter inch / 0.75cm deep. Cover the hole with a bit of Rockwool
so the seed has a dark place to sprout from. Take a small piece of saran wrap or a clear
plastic bag and cover the cubes to keep the moisture in. In a couple of days wet the cubes
again with your pH balanced water.

Most seeds will begin to sprout in four to six days. Once they have sprouted, remove the
saran wrap and moisten the cubes again.

Mix the nutrients

Yellow FlowerThe nutrients are the plantâ€™s source of food so it is important that we do not
give them too much or too little. The hydroponic nutrients supply all of the mineral elements
that plants otherwise would get from the soil. Since your plants are still very young, mix the
nutrient solution at half strength this time.

So use 2.5 ml of each the â€˜Aâ€™ and â€˜Bâ€™ nutrient per litre (Check the instructions on your
nutrients.). Mix enough solution to fill your tray to Â¾’s of the height of the Rockwool cubes.

pH balance the solution

This process is identical to the procedure for preparing the seeding cubes. Always adjust
the pH level after mixing the nutrients as they will also lower the pH a little.

Flood and Drain your garden

Raise the bucket above the garden so the nutrient solution will flow into the tray.
The tray should be flooded to Â¾ of the cubesâ€™ height and drain immediately after. Make sure
to not submerge the roots for more than 3 minutes.

Repeat this 2 to 3 times per day.

Maintenance of your nutrient solution

2ft Hydro HarvestPlants use more water than nutrients, therefore top up the bucket with
fresh water daily and pH balance the solution to 6.0 / 6.5.

Make a new solution each week. After the first week use Â¾ strength nutrients, a week later
you can start mixing a full strength solution.

This Flood and Drain technique exposes the roots directly to the nutrient solution. Erratic pH and EC (the amount of dissolved salts in the solution) is caused by the roots acting directly on the nutrient solution. Plants will benefit greatly by keeping these levels steady.

A remark on light

Remember that light is very important. If your plants donâ€™t have light, it doesn’t matter what you give them.

Written by Mike · Filed Under Hydroponics Experiments