A plant physiologist is trying to determine which nutrients are essential to the growth of plants,so the best method to use would be

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The preferred method for determining the mineral requirements of a plant was developed at the end of the nineteenth century by the German plant physiologists Julius von Sachs and Wilhem Knop.The method,called water culture or hydroponics,allows plants to grow well in water,instead of soil,if they are supplied with all the nutrients they need.The investigator omits a particular mineral and observes the effect on plant growth.If growth suffers,the omitted mineral is an essential nutrient.

A Plant Physiologist Is Trying to Determine Which Nutrients Are