When it comes to nutrients, plants can be like Goldilocks. For healthy growth and reproduction, nutrient levels have to be just right. Plants can suffer from both nutrient deficiencies and nutrient toxicity. Each species of plants has its own nutrient requirements. The balance between enough and too much of a given nutrient can also be a moving target. Plant nutrient needs and tolerances can change as a plant reaches different stages of development or reproduction. To complicate matters even more, any environmental variable that influences nutrient mobility through soil, nutrient uptake by the plant, or nutrient mobility within the plant will com….