Hydroponics vegetables are grown suspended in a liquid solution containing elements that the plant needs to thrive. There have been rumors that Hydroponically grown fruits and vegetables have a buildup of harmful chemical they absorb from the solution. These rumors are completely untrue. The plants require 17 essential elements to grow and reproduce.
Nitrogen, Phosphorous, Potassium, Calcium, Magnesium, Sulphur
Iron, Manganese, Copper, Zinc, Boron, Chlorine, Molybdenum, Nickel
In Hydroponic, there is no soil to supply these elements found in the soil so they have to be added into the growing solution. This makes it look like we add a wide variety of chemicals to the solution. Actually, we add these elements to make our solution compared to a solution from fertile soil, nothing more and nothing less. All the elements added to the growing solution are essential elements of human as seen in the label of standard vitamin-mineral supplement tablets, Centrum for example. Hydroponics is just a different way of providing what a perfect soil would provide namely air, water, support and nutritional. Hydroponics actually grows vegetables with higher nutrients value because of the optimum growing conditions.
Whether you make your own nutrient solution from the different fertilizer salts, or by a pre-made brand, problems can, an often to arise with deficiencies of one or more of the nutrient elements.
And just to complicate matters further, even if your solution is well balanced, sometimes environmental and internal plant conditions prevent the uptake of certain nutrients and deficiency symptoms then results.
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