Can plants suffer from a shortage of vitamins?

Put simply, the new class of farm inputs called biostimulants aims to support vigorous plant development and growth. To draw an analogy, biostimulants are like vitamins that we -humans- take in winter to strenghten our resistance.
Here is a rigorous definition of biostimulants, as proposed by the European Biostimulants Industry Council :
Plant biostimulants contain substance(s) and/or micro-organisms whose function when applied to plants or the rhizosphere is to stimulate natural processes to enhance/benefit nutrient uptake, nutrient efficiency, tolerance to abiotic stress, and crop quality.
The rhizosphere is the area of the soil that surrounds the roots and that is altered by the plant’s roots growth, nutrients, respiration, etc.

 
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