2 - Plant Nutrition_Handout (3).pdf

2 - Plant Nutrition_Handout (3).pdf - Plant Nutrition What...

Info icon This preview shows pages 1–5. Sign up to view the full content.

THE ESSENTIAL ELEMENTS Plant Nutrition What are plant nutrients? Essential elements required for normal plant growth. Present in soil solution or nutrient solution. All essential elements MUST be provided by the grower in a hydroponic system. In a soil system, nutrients become available in the soil solution. Total > labile > available Nutrients present in the soil are in one of those three fractions. Nutrients in hydroponic solution need to all be available. Three Rules for Essentiality 1. The element must be needed by the plant to complete its life cycle. 2. No other element can substitute for the element in question. 3. The element must exert its effect directly on growth or metabolism and not by some indirect effect. 16 Essential Elements C, O, H, N, K, Ca, Mg, P, S, Cl, Fe, Mn, B, Zn, Cu, Mo Typically divided into macro- and micronutrients. Depending on source, between 14 and 18 essential elements.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Macronutrients “The Freebies” 1. Carbon (C) 2. Hydrogen (H) 3. Oxygen (O) Primary Macronutrients “The Big 3” 1. Nitrogen (N) 2. Phosphorus (P) 3. Potassium (K) Secondary Macronutrients 1. Calcium (Ca) 2. Magnesium (Mg) 3. Sulfur (S) Micronutrients 1. Iron (Fe) 2. Manganese (Mn) 3. Copper (Cu) 4. Chlorine (Cl) 5. Boron (B) 6. Nickel (Ni) 7. Zinc (Zn) AKA: MAJOR ELEMENTS Macronutrients C, H, O The Freebies
Image of page 2
Carbon Carbon is acquired from CO 2 present in atmosphere. Brought in through stomates in leaves. What is the current concentration of CO 2 in the atmosphere? Plants fix carbon. Carbon is a major structural component of plants. Carbon Symbol: C Available form: CO 2 Atomic weight: 12.01 Concentration in plant dry matter: 45%; 450,000 ppm Function(s): Major structural component of all organic matter. Hydrogen Symbol: H Available form: H 2 O Atomic weight: 1.01 Concentration in plant dry matter: 6%; 60,000 ppm Function(s): Major structural component. Ion exchange reactions in soil-water-plant interface. Oxygen Symbol: O Available form(s): O 2 , H 2 O Atomic weight: 16.00 Concentration in plant dry matter: 45% ; 450,000 ppm Function(s): Major structural component. Important for ion exchange reactions (H + acceptor). The Freebies 96% of plant dry matter We don’t have to supply the freebies. In some cases we can boost uptake CO 2 injection N, P, K AKA: THE BIG THREE The Primary Macronutirents
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Nitrogen Symbol: N Available form(s): NO 3 - , NH 4 + Atomic weight: 14.01 Concentration in plant dry matter: 1.5% ; 15,000 ppm Function(s): Structural component of many organic compounds – amino acids (hence proteins), coenzymes, nucleic acids, and chlorophyll Molecular structure of chlorophyll A Phosphorus Symbol: P Available form(s): H 2 PO 4 -, HPO 4 -2 Atomic weight: 30.98 Concentration in plant dry matter: 0.2% , 2,000 ppm Function(s): Structural component of many important organic compounds Energy transfer (ATP) Potassium Symbol: K Available form(s): K+ Atomic weight: 39.10 Concentration in plant dry matter: 1.0% 10,000 ppm Function(s):
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '08
  • Brown,J
  • pH

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern