Question

what is the main disadvantage of using in organic fertilizer​

Answer 1

Explanation:

The biggest disadvantage of using an organic fertilizer is that it may not contain primary nutrients like nitrogen, phosphorous or potassium, also known as NPK. Manure-based fertilizers contain these nutrients and are still considered organic. However, many others don’t contain significant quantities of NPK. They’re just soil amendments.

Answer 2

minerals like potassium, iron and etc. are not present in equal proportions.

nutritional value is low.