3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
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Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes
Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes
Did you know …. Did you know that some nutrients for plant growth are only needed in atom level quantities, but without them yields can and are limited? Chapter 14 finalizes our discussion on the macro and micronutirents in soil, and finishes with an important discussion on nutrient management.
Lecture content notes are accompanied by videos listed below the notes in each submodule (e.g. Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Videos A thru C). Print or download lecture notes then view videos in succession alongside lecture content and add additional notes from each video. The start of each video is noted in parenthesis (e.g. Content for Video A) within each lecture note set and contains lecture content through the note for the next video (e.g. Content for Video B).
Figures and tables unless specifically referenced are from the course text, Nature and Property of Soils, 14th Edition, Brady and Weil.
Content Video A
Soil Calcium, Magnesium, and Micronutrients
AGRI1050R50: Introduction to Soil Science (2020S) LH
3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403434/View 2/7
http://caldwell.ces.ncsu.edu/2013/07/avoiding-blossom-end-rot/
Calcium and Magnesium Macronutrients
Plants – Needed just under amounts of N,K Calcium
Plants – Major component cell walls, growth, enzymes Animals – Bones and teeth Not generally a problem unless VERY acidic
Magnesium Plants – Photosynthesis, enzymes, bridge for ATP Animals – Grass Tetany
Not overly problematic – weathering/dissolution soil minerals Availability linked to soil pH and amount of weathering Lime – adds back from plant uptake/leaching
Calcium and Magnesium Cycles
Content Video B
Trace Element Trace Element – Based on abundance in soils
< 100 mg/kg in soil solids or < 100 mol/L in soil solution Micronutrient Nutrients required for plant growth but in small quantities
http://caldwell.ces.ncsu.edu/2013/07/avoiding-blossom-end-rot/
3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403434/View 3/7
Micronutrient – Nutrients required for plant growth but in small quantities ‘C-HopKinsCafe’ micronutrients (17 total) Non-Mineral (3): C, H, O Macros (6) : N, P, K, S,C a, Mg Micros (8): Fe, Mn, Cl, Zn, Ni, Cu, B, Mo <Some include Cobalt)
Micronutrients may or may not be trace elements
Macro-Micro Nutrients
http://soils.wisc.edu/facstaff/barak/soilscience326/listofel.htm
Trace Elements too
Metallomics, 2012, 4, 1017-1019
Deficient, Sufficient, or Toxic?
http://soils.wisc.edu/facstaff/barak/soilscience326/listofel.htm
3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403434/View 4/7
Relative Nutrient Levels in Plants
Why the big fuss? Intensive ag – depleted micronutrients Less ‘contamination’ of commercial fertilizers, less organic/manure application Better technology – Assess deficiency/toxicity
Functions Micronutrients
Micronutrient Symptoms
3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403434/View 5/7
Sources of Micronutrients Inorganic: Soil minerals, precipitates, and clays Organic: Bound with SOM
Micronutrient Ions in Soil Solution
3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403434/View 6/7
Content Video C
Conditions Conductive to Micronutrient Issues Leached, acid, sandy soils Intensive cropping Extreme pH Eroded soils Parent materials Waste disposal
Availability Cations – Fe, Mn, Cu, Ni, Co
pH – more available with lover pH Oxidation – more available in reduced conditions CEC – involved in CEC reactions Chelation – complexation with organic compounds
More or less plant available Microbial or Synthetic (EDTA)
Anions – Cl, B, Mn Cl – not huge issue except in alkaline soils, easily leached B – Boric acid, readily leached Mo – pH dependent: odd ball, more available at high pH, insoluble at acidic pH
Plant Susceptibility/Tolerance Micronutrients
Common Soil Amendments of Micronutrients
3/29/2020 Soil Calcium, Magnesium, and Micronutrients (Chapter 15) Notes – AGRI1050R50: Introduction to Soil Science (2020S)
https://gotoclass.tnecampus.org/d2l/le/content/8094442/viewContent/60403434/View 7/7
Reflect in ePortfolio Download Print
Review Ca/Mg/Micronutrients What is the major source of Ca/Mg in soils? What is the difference between a trace element and a micronutrient? What are the main micronutrients? What are the ionic forms of the micronutrients found in the soils solution?
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