Essential elements The term essential mineral element(or mineral nutrient) was proposed by arnon and stout (1Q39) They concluded three criteria s Y must be met for an element to be considered essentia(必需的)
◼ The term essential mineral element (or mineral nutrient) was proposed by Arnon and Stout (1939). ◼ They concluded three criteria(标 准) must be met for an element to be considered essential(必需的). Essential elements
Three criteria of Essential elements 1. A plant must be unable to complete its life cycle in the absence of the mineral element 2. The function of the element must not be replaceable by another mineral element or deficiency symptoms can not be remedied by supplying some other element 3. The element must be directly involved in plant metabolism
Three criteria of Essential elements ◼ 1. A plant must be unable to complete its life cycle in the absence of the mineral element. ◼ 2. The function of the element must not be replaceable by another mineral element. or deficiency symptoms can not be remedied by supplying some other element ◼ 3. The element must be directly involved in plant metabolism
Sixteen essential elements Carbon(C Hydrogen(H) Oxygen(O Nitrogen(N) Phosphorus(P Potassium(K) Calcium(Ca) Magnesium(Mg) Sulfur (S) Iron(Fe) Manganese(Mn) Copper(Cu Zinc(zn Molybdenum(Mo) Boron(B) Chlorine(CD)
Sixteen Essential Elements Carbon (C) Hydrogen (H) Oxygen (O) Nitrogen (N) Phosphorus (P) Potassium (K) Calcium (Ca) Magnesium (Mg) Sulfur (S) Iron (Fe) Manganese (Mn) Copper (Cu) Zinc (Zn) Molybdenum (Mo) Boron (B) Chlorine (Cl)
Nutrient Composition of plants 1 Elemen七6 CHO ~94%。 f dry wt
Nutrient Composition of Plants
Relative amounts of essential elements in plant tissues MAJOR ELEMENTS (obtained from water and carbon dioxide H MINERAL NUTRIENTS N KCa Mg P S Si Cl Fe B Mn Na Zn Cu Ni Mo
Relative amounts of essential elements in plant tissues