Efficient fertilisers use results in

Efficient fertilizers use results in more crop per kg fertilizer.
The term "fertilizer efficiency" is defined as the amount of increase in yield of the harvested portion of the crop per unit of fertilizer nutrient applied where high yields are obtained.
The timing and quantity of fertilizer depending on the source of fertilizer, nutrient content combination, and their interactions with land and land use aspects were crucial elements for getting an optimum response to fertilizer.