Chapter 1 Essential elements
Chapter 1 Essential elements
Concept of plant nutrition a Plant nutrition is a term that takes into account the interrelationships of mineral elements in the growth medium as well as their role in plant growth
◼ Plant nutrition is a term that takes into account the interrelationships of mineral elements in the growth medium as well as their role in plant growth. Concept of plant nutrition
Concept of plant nutrition Complex interactions involving weathering(风化) of rock minerals, decaying(腐解) of organic matter such as humus and residues of plant animals, and microbes, take place to form inorganic minerals in SO
Concept of plant nutrition ◼ Complex interactions involving weathering（风化） of rock minerals, decaying(腐解） of organic matter, such as humus and residues of plant ,animals, and microbes, take place to form inorganic minerals in soil
Concept of plant nutrition Roots absorb mineral nutrients as ions in soil water. Many factors influence nutrient upta ke for plants. This interrelationship involves a complex balance of mineral elements essential and beneficial for optimum plant growth
◼ Roots absorb mineral nutrients as ions in soil water. Many factors influence nutrient uptake for plants. ◼ This interrelationship involves a complex balance of mineral elements essential and beneficial for optimum plant growth. Concept of plant nutrition
Essential elements The material of living plants consist of organic matter, water and minerals. The percentage distribution of these three components is in the following order of magnitude Water 70%(fresh matter) Organic material 27%(fresh matter) Minerals 3%(fresh matter)
Essential elements ◼ The material of living plants consist of organic matter, water and minerals. The percentage distribution of these three components is in the following order of magnitude: ◼ Water 70%(fresh matter) ◼ Organic material 27%(fresh matter) ◼ Minerals 3% (fresh matter)
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