anttal63 wrote:An American fella by the name of John kirby taught this rule of thumb.
Deciduous prefer chemical ferts
Conifer's and broad leaf Evergreen's prefer organic ferts.
I would like to see the data supporting this! It makes no scientific sense to me at all!
All plants take up nutrients in ionic form and whether they come from maufactured or organic sourses, the ''chemicals'' are the same. The difference lies in the fact that maufactured ferts. are much more concentrated than organics, hence you need to apply them at much lower rates.
With regard to Dynamic lifter and similar products, they are based on Chicken manure from the fowl industry and need to be used with caution as they can have very high salinity levels from ammonium as well as Sodium and Choride. They are usually quite alkaline too from the shell grit fed to the birds, so they should be looked on as unsuitible for acid loving plants like azaleas, gardenia even many conifers etc. They can also have P levels too high for many plants inc. natives. They are fine for your vegies or in-ground trees but I think there are better alternatives for bonsai.
I have used them sparingly but I find they release their N too quickly and got very large and rank growth.
The best fertilizer by FAR that I have used is home made cakes 70-30 soybean meal/blood and bone for established trees. Or if you can't be bothered, sprinkle B/B and 5% pottasium sulphate. Seasol will also provide K.
Many people use osmocote for their trees but I still prefer the results with the cakes.