O wait, were we talking container culture or in ground? In ground it is good to grow organic and worry about those microorganisms, in container culture synthetics work much easier... Those micro colonies function based on soil temp and other conditions and are inconsistant in container culture. In fact, many container gardeners that have ornamental trees in containers for long periods realize synthetics are the most effective way. The micro life in the soil breaks down food for the plant from the organics, at the same time they break down the structure of the grow media thus decreasing air porosity. Also, growing in a high air porosity media organically would be a up hill battle as the macropores in the high air porosity grow media would not work as they need a lot of fine particals to colonize.
"One of the drawbacks of organic crop production vs. standard hydroponic fertilizer is that the majority of nutrients are not immediately available to the plant. This makes it very difficult to monitor and regulate concentration and ratios of elements available to the plant. If using premium hydroponic fertilizers, the vast majority of nutrients are immediately available in precise and measurable values. As a result, healthy vigorous plants can reach their genetic potential which includes characteristics such as taste and flavor. Plants do not differentiate the nutrients they absorb resulting from hydroponic or organic nutrient solutions. For example, nitrogen is typically available as NO[sub]
3[/sub]- or NH[sub]
4[/sub]+. It does not matter to the plant whether it came from guano or bottled nutrient. "
http://www.simplyhyd...aste_better.htm