Plant analysis (leaves, fruit, etc.) aims to relate the mineral content of the plant (or part thereof) with its physical appearance, growth rate, yield or quality of the harvested product, and the nutrient content of the soil. Precise sampling procedures—regarding the selected plant part and the growth phase (time of sampling)—are required. Interpretation of results assumes a significant biological relationship exists between the elemental content of the soil, the plant, and its growth or production.