Thread: Fertilizer
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Old May 14, 2013   #68
ScottinAtlanta
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Quote:
Originally Posted by Urbanfarmer View Post
("super bloom 12-55-6") I say this with all due respect: this ratio is great for indoor pot-growing, but is the opposite of what tomatoes require for optimum fruiting, at least in reference to the P and K. During fruiting, tomatoes want less P than N, by about half, or even less. They want as much as twice the amount of K than N. A large amount of potassium is fundamental in maturing tomatoes: it contributes greatly to sweetness, firmness, disease resistance, and many other metabolic processes. Only small amounts of P are needed. Calcium is needed at roughly 2/3's the amount of N.

I say this not to sound like an internet expert, which we're all familiar with, but from 30 years of greenhouse experience, and many thousands of dollars spent on lab analysis. Also, read the research from any ag university and it will say approximately the same thing.

It sounds like you are happy with your results. Perhaps if you switched to a ratio of 2-1-3 (or any multiple, such as: 6-3-9, 12-6-18, etc) you might even see better. However, since you already are adding bone meal to the hole, you might reduce that middle number even more.

Best regards,
Tomato Tone is 3-4-6 - that seems like it would do the job.
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