Zoology - Microbes in Human Welfare Question with Solution | TestHub

Fertilizers are classified in several ways. They are classified according to whether they provide a single nutrient (e.g., K, P, or N), in which case they are classified as "straight fertilizers." "Multinutrient fertilizers" (or "complex fertilizers") provide two or more nutrients, for example N and P. A fertilizer, which contains only one nutrient is known as straight fertilizer or simple fertilizer.