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Secondary Growth in Roots Secondary growth occurs in many roots and usually results in the thickening of the root diameter by the addition ofvascular tissue.Initiation of secondary growth occurs when cells in the residual procambium and parts of the pericyle begin to make periclinal divisions.Only the pericyle cells opposite the xylem points start to make periclinal divisions. The inner layer of cells becomes the vascular cambium.nitiation of secondary growth occurs when cells in the residual procambium and parts of the pericyle begin to make periclinal divisions. Only the pericyle cells opposite the xylem points start to make periclinal divisions.
Secondary nutrients are more commonly used in conjunction with hydroponic grows where there is a need to replicate the nutrients found in soil. - Calcium (Ca) â Calcium is used by your marijuana plant for cell production and growth, maintaining healthy roots and ensures the proper flow of sugars and nitrogen.oil as a medium contains a large number of the nutrients your plant requires during the growth cycle. As your plant grows the nutrients in the soil will be used up and so will need to be replaced using a fertilizer.