Quote:
Originally Posted by Nicolas Naranja
It all depends on what you soil has naturally. I only supply potassium fertilizer to the ground and put all my micros out foliar.
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Yes, although plants are constantly removing it and in the case of bananas a whopping 2/3 of the potash goes to fruit. In an orchard setting, soil mineral reservoirs will be depleted within 7 years. A grower can definitely take soil tests every year and then "top off" to replace what is missing. This is highly recommended prior to any planting for a new garden, landscape, or orchard. Afterwards though, if the consumption of the plants is generally known and they are being fed appropriately, then soil tests every 5 years is more than adequate.