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An incomplete fertilizer will bemissing 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 are blended to make complete fertilizers.

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A fertilizer is said to be a complete or mixed fertilizer when it contains nitrogen, phosphorus and potassium (the primary nutrients). An incomplete fertilizer will be missing one or more of the major components.

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.

Complex fertilizers is defined as a material containing all three prirnary, nutrients ( N,P and K) and it is also designated as complete complex fertilizers while a fertilizer material containing one or two of the primary nutrient elements (N and P or P and K etc ) are known as incomplete complex fertilizers.

For example, a fertilizer with equal amounts of each element would have an N-P-K of 5-5-5. This would be considered a general-purpose, complete fertilizer. However, to be considered complete, a complete fertilizer doesn’t need to have equal amounts of each of these, just close to it.