Complete versus Incomplete Fertilizer

A fertilizer is said to be a complete or mixed fertilizer when it contains nitrogen, phosphorus and potassium the primary nutrients . Examples of commonly used complete fertilizers are 6-12-12, 10-10-10, 15-15-15 and 20-10-10. An incomplete fertilizer will be missing one or more of the major components. Examples of incomplete fertilizers are 34-0-0 ammonium nitrate , 46-0-0 urea , 18-46-0 diammonium phosphate , 0-46-0 triple super phosphate and 0-0-60 muriate of potash . Incomplete fertilizers...

Special Purpose Fertilizers

Special purpose fertilizers are primarily used in the small fruit and nursery industries. When shopping for fertilizer, you will find that some are packaged for very specific uses, such as blueberry food. The blueberry sometimes called rhododendron or azalea fertilizer food is one example of these specialty materials and belongs to an old, established group, the acid-plant foods. Some of the compounds ammonium sulfate is usually the acidifying ingredient used in these fertilizers are chosen...