Creating a Sustainable Sunshine Coast - Nambour to Mooloolah

The Future Ready Expo at Kawana was quite an eye opener. There was a lot to see and hear. Listening to Roberto Perez (from the Power of Community DVD) was a real treat. We all remember his quote about riding bicycles ;-) Then there was Geoff Lawton. Who hasn't been inspired by the "Greening the Desert" flash animation on the web?

But one of the most intriguing discussions I attended was regarding building soil in a sub tropical climate. As organic gardeners we're always trying to build soil using compost. It helps, but in a tropical and sub-tropical climate we can easily lose our nutrients to torrential downpours leaching it away. So much we read about compost is for more temperate climates in Europe and North America that hearing a new take on it for the tropics was fascinating. Due to the differences in climate in temperate gardens 80 percent of the nutrients are held in the soil. But in a sub-tropical garden this is only 20 percent. The rest is held in the plants themselves..

Having a layer of organic matter, mulch, continually shielding the soil from blasting sun and torrential rain is a natural way of protecting the nutrient levels in the soil. Frances Michaels from Green Harvest gave a great lecture on what we need to do in a sub-tropical environment to build great soil. Remember that soil is alive. Dirt is dead. So having an active layer of mulch, leaves and other vegetable matter, covering the soil promotes this in a sub-tropical garden. Grow plenty of plants that are good to "cut and drop" to provide this nutrient rich mulch layer. Remember, we're trying to create a rain forest in your backyard.

We don't necessarily want to have too many nutrients in the soil. We want a continuous slow decomposition of organic matter into nutrients. With the weather being warm enough for this to happen with out having to pile it high in mounds we don't need to work so hard at composting as those living in more temperate climates. Obviously if we have a no dig garden or raised bed these rules will change but the natural food forest concept at this latitude and rain fall really doesn't need us to work so hard at building compost.

One of the great additions to a backyard permaculture forest are chickens. Originally forest fowl, they have been bred for maximum plumpness and egg producing capacity but are still right at home in a well shaded food forest garden. They turn the mulch while looking for bugs and can reduce bugs and leafy greens to nitrogen rich manure.

So if you are thinking of having a food forest in your backyard, you won't need to think about where your kitchen vege scraps go. Feed them to your chooks under your fruit trees, no compost turn and you have the bonus of fresh free range eggs for breakfast.

Dean