This Sustainable House

Posts Tagged ‘Irrigation’

A few months ago I wrote a post explaining the strawberry towers that I have decided to use at TSH (see link below). I thought that this was a good time to provide an update.

As was previously noted, I lost a few crowns when the irrigation system failed, but since re-jigging the system I haven’t had any issues. As you can see from the photo’s, the remaining crowns are doing really well.

The one change that I would like to make to the system would be to add a fertiliser ‘injector’ into the system which would make adding liquid fertiliser much easier. At the moment I periodically stand on a ladder to pour a seaweed fertiliser into the tubes. This isn’t the end of the world but it would be easier!

The other option is to perhaps integrate the system with the proposed aquaponics system, but we’ll see how that pans out as the season progresses.

Update (4/12/10) – After a week of almost solid rain another ‘problem’ has become apparent… slugs! Today when harvesting some fruit I noticed some slug damage. I think they are getting to the plants via the mint beneath which has gone beserk, and grown taller than the bottom of the tower. I think the slugs are then just bridging the gap. However there is nowhere for them to hide, so picking them off and eliminating the bridge should do the job nicely.

Photo Updates

Strawberry Tower on 7 November

Strawberry Tower on 20 November 2010

Every weekend I set myself a task to complete around TSH that keeps the vision moving in the right direction. Sometimes this task is large, such as fencing a new paddock, but at other times it can be quite small such as improving an existing system. This weekend, my task was to build a new vege garden using the wicking bed system.

A wicking bed is a marvellously efficient garden design in which you water from below. It is basically a giant self-watering pot in which you water via a filling tube. The water creates a reservoir under the soil of the bed, and the water then ‘wicks’ up to water the plants. The major advantage of the system is that there is no free water on the surface, so evaporation is minimal.

At TSH we have two beds, both located on the back verandah, which have been designated to be wicking beds. And this weekend I created one of the beds. The location of the beds was chosen so as to allow year round growing (it’s under the eaves so shouldn’t be too effected by frost) as well as to be close to the kitchen (virtually in zone 0, if you are permaculturally inclined). It should also help reduce the amount of reflected sunlight into the entertaining area during summer which should help make this area feel much more comfortable.

And let’s not forget… produce a mass of picking greens, herbs and other vegetables for the kitchen.

A video-essay of the building of this bed can be found on Green Phoenix Permaculture.

I’ll post an update in a few weeks around how it is going. Below are some time staged photos… click on them to zoom.

Wicking Bed (Week 1)

This weekend we were blessed with the most incredible weather and it seemed a shame to waste it. It’ll be very cold all too soon!

So this weekend was spent pottering, doing a few homey things such as planting seeds, chopping wood and building strawberry towers. In fact, the strawberry towers are what this post is all about…

So what is a strawberry tower? Well in this case it is a length of PVC drain pipe (100mm diameter x 1400mn length) with a series of small holes drilled in the side (24 in all). The bottom of the tower is capped, the cap having drain holes drilled in it, and the top is hung by chain from the verandah fascia.

The strawberry crowns are planted in the holes, into enriched potting mix, and are watered by a central ‘weep’ line down the centre. The top section, where the chain joins the pipe, is then filled with clean straw to minimise evaporative losses.

The concept is that the strawberries grow against the clean PVC outer, allowing one to just pick and eat. They are also at an easy height for picking without bending, are kept free of the ground and therefore snails and slugs, and take up very little floor space (the strawberries are growing in the vertical space like a vine). In fact there is still room beneath for a pot of herbs, say mint, which cab collect the drainage water from the tower.

This concept of ‘stacking’ is very important in all permaculture designs as it allows us to significantly increase the yield from all available space. For example, if I planted the strawberries in the garden (using the same area of about 30cm diameter) then I’d have room for 5 plants yielding about 1.75Kg of strawberries (~7 punnets). However by planting the strawberries in the vertical plane I have managed to squeeze in 24 plants which should yield about 8.4kg of strawberries (~33 punnets) AND a herb crop such as mint from the pot underneath. All up this is an increase of yield of over 400% which is just phenomenal.

A fact sheet detailing the design/construction of these pots will be available on the Green Phoenix Permaculture website in the next few weeks, so if you are interested in creating some strawberry towers then head over to there.

UPDATE

Today I noticed a ‘fault’ with the irrigation system. Essentially the piece of ‘weep hose’ which watered the towers has failed leaving the plants dry, and some dying. Unfortunately I think I’ll lose about 6 crowns due to the failure, but they can be replaced.

I had honestly thought that this might be a problem, the chance of the tubing clogging with small particles was always pretty high. As a result the ‘back up plan’ was to place a dripper in the top of the tower, and let gravity do the work. So that’s exactly what I have done… I’ll let you know how it gets on.

Well the weather has been getting cooler and already the greenhouse is begining to show some promise. A few weeks ago I spent an afternoon taking root cuttings of some Bocking 14 Comfrey. Bocking 14 is a special cultivar of comfrey, developed at the Henry Doubleday Institute, which doesn’t produce viable seed. It was chosen for TSH to reduce the weed risk associated with this plant.

Anyhow, the root cuttings were planted into some super tree tubes, and then placed into the greenhouse under the automatic misters. Today, the signs of life are more than evident…

Check out the video below for more information.

Or perhaps, mote accurately, collect water while the rain falls…

Water is the number one limiting factor at TSH, as it is for most Australian farmers. We are, after all, the driest inhabited continent on Earth.

Like most rural properties, TSH has no reticulated water access but relies on the water that can be collected off the roof or catchment run-off. In the case of roof run-off the water is stored in a series of thanks with approx 140,000L capacity. However catchment run-off is a different tale with main storage being one medium sized delapidated dam. Damn!

The fact that our dam doesn’t hold water, if you’ll excuse the obvious pun, is actually a blessing as it encourages me to be more creative with how water is stored on the property. Which brings me to the point of this post… Swales!

Swales are an earthwork designed to capture water in-situ and transmit that into the sub-soil. Whilst in a dam one attempts to capture water with an impervious layer, in the case of a swale we capture it with a permeable layer. The basic principle, as demonstrated below, is to trap rainwater using trenches/embankments placed along a contour and then allow this water to permeate into the soil where it flows under the surface. This has the advantage of lowering evaporative losses as well as placing the water right where our plants need it, at their roots. It also reduces erosion and, best of all, requires NO energy to run a pump… Grand.

In the case of TSH there are a couple of areas that would benefit from swaling. The first area is in the quarantine yards where the swales will capture road run off and direct it to a better use. The second area is the rear paddocks where the run-off can be chanelled along the countours to collect both from the ‘interswale’ areas and the neighbours paddock.

As we develop these earthworks I will post additional comments but in the meantime just imagine the possibilities.

One of this weekends task’s was to begin setting up the greenhouse. One of the first things I needed to do was to setup a couple of propagation tables with irrigation system. The irrigation system is attached to a automatic timer ensuring that the system turns on, and off, regularly throughout the day without supervision.

The video below details the system…