Determining the amount of phosphorus (P) absorbed by roots, and the rest of the sunflower (Helianthus annuus) seedlings in the first days of germination, from Knopp nutrient solution

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Article Title:	Determining the amount of phosphorus (P) absorbed by roots, and the rest of the sunflower (Helianthus annuus) seedlings in the first days of germination, from Knopp nutrient solution
Authors:	Andreea Ioana Rusu, Aurel Aredelean, Violeta Turcus
Affiliation:	“Vasile Goldiş” Western University Arad, Faculty of Medicine, Pharmacy and Dentistry, Romania
Abstract:	In this research, seedlings introduced in the absorption medium were not immersed in the solution used as substrate as a whole but separately the roots and in other flasks the part of the seedling above the hypocotyl that is from the basis of the radicle upwards, comprising the shoot. The determinations of the absorption of P in the seedling was done assessing the amount of P, respectively of phosphate remaining in the solution after the plant material was kept in the solution for 1 hour and the amount of P that penetrated the organs and eventually extracted from tissues or organs of seedlings was not determined. The method for determining the P from the Knopp medium, remaining after seedling organ removal was done by standard procedure EN ISO 6878 which came into effect in August 2008, imposed by current law in our country, for assessments of phosphorus in water.
Keywords:	radioactive isotope, Knopp solution, specific absorption, total absorption
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*Correspondence:	Andreea Ioana Rusu, “Vasile Goldiş” Western University Arad, Faculty of Medicine, Pharmacy and Dentistry, Romania