西北农林科技大学：《植物营养学》课程教学资源（PPT课件讲稿，英文版）Chapter 01 Essential elements

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