Peaceful Valley Farm & Garden Supply is a source or fertilizers and information that has been invaluable to me. http://groworganic.com

I've learned as much from there catalog and website as I have from reading other sources and my own hands on experience. I'm not sure if they'll ship to Oz or not but as a reference resource it's well worth bookmarking.

I grew Amish Paste heirloom tomatoes in concrete reinforcement wire cages that reached a length of at least 20 ft. and each plant provided over a bushel and a half of ripe fruit, not to mention the green tomatoes for making fried green tomatoes. My cages were 10 ft. tall with guy wires to stabilize them and the vines came back down the outside, then onto the ground. Frost stopped them from growing and producing any further. My pepper plants got large enough to begin forming bark on their lower trunks by the end of the season and stood nearly 5 ft. high as well. Broccoli yields way past the normal early season into the middle of summer with numerous cuttings until I allowed them to go to seed for saving.

I think some of their products would fit into the AP scheme of growing without upsetting the balance. Foliar feeding would probably have little or no effect on the water quality of the system. Just makes sure not to get too carried away and cause and large amount of dripping; spraying the underside of the leaves is most effective. The yield, flavor, vigor and hardiness of your plants would be monumental. It is by far my secret to massive yields from all my veggies. It works on fruit trees, fruit bushes and fruiting vines like grapes, kiwi fruit, etc. since I'm sure some of you have soil bound plants also.

Myself and other gardeners have also incorporated classical music playing for the plants with surprisingly good results too. I know it sounds weird but the plant stomata respond to sound and receive foliar nutrients more readily this way. Bach, Beethoven, Tchaikovsky, Schubert, Handel, Vivaldi, Scarlatti and Mozart seem to do the trick quite nicely. Early in the morning (at the crack of dawn) is the best time to foliar feed the plants; birds singing also affect the stomata. It also allows you to feed the plants what they need during the various stages of growth and fruiting.

Perhaps there's a similar outlet in Oz if Peaceful Valley won't ship internationally, or perhaps this is an opportunity for someone in Oz to become a franchisee. You never know until you try.

Cheers!
Dean