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AGR 2320 (34)

Class Notes for AGR 2320 at University of Guelph

Soils in Agroecosystems

AGR 2320 Lecture Notes - Lecture 35: Winter Wheat, Protozoa, Reduction Potential

2017-11-23 Agr2320 Soil organic matter Carbon cycling Carbon is released in the atmosphere and fixed Huge amount of carbon existing in the ocean sediments 40 Pg OCEAN PLANTS- most of the ocean is to deep, bot...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 34: Loam, Field Capacity, Evapotranspiration

Water budgets Tuesday, November 7, 2017 Management of water Water budgets Excess water- drainage Water deficiency irrigation and salt problems Whether or not it will be cost efficient? High value crop, eve...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 32: Cation-Exchange Capacity, Calcite, Wood Ash

Soil pH Agr 2320 Tuesday November 21, 2017 pH= -log (H+) carbon dioxide and carbonic acid are always in equilibrium natural rainfall has a slightly acidic pH Measuring soil pH pH electrodes: soil pa...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 31: Ammonium Nitrate, Clay Minerals, Modelling Clay

Clays -AGR 2320 Thursday, November 16, 2017 Building blocks of clay minerals: Silica tetrahedron, isomorphic substitution (more negativity charged) Aluminum Octahedron: Mg replacing the Al, has a different charge...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 20: Pore Space In Soil, Dew Point, Water Retention Curve

AGR 2320 NOV.2.2017 Water Retention Curve -Describes the functional relation between water content and matric potential -What is the ability of the soil to pull in water -Smaller pores have greater pull on water -As the...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 18: Soil Horizon, Hydraulic Conductivity, Sphagnum

Thursday, October 26, 2017 Water in Soil Understanding where a chemical will end up? Water cycling -Where does what exist on earth- ocean (salt water) The Hydrologic Cycle -You can see that it is a cycle -run by sola...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture 19: Tuesday Oct 31 AGR2320

Tuesday, October 31, 2017 Water is polar allows it to attract to surfaces along with itself Matric potential does not exist below the water table, always negative Total Water Potential and Hydraulic Potential Hydraulics po...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture 33: Fertilizer Calculations and Sustainable Land Management
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AGR 2320 Lecture 33 Fertilizer Calculations and Sustainable Land Management Fertilizer Calculation Crop requires: o 150 kg Nha o 60 kg P2O5ha o 100 kg K2Oha Fertilizers used: o Urea 4600 o MAP (monoammonium phosphate) 1152...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 31: Vermiculite, Illite, Cash Crop
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AGR 2320 – Lecture 31 – P-Fertilizer & K P Fertilizer Production (John Lauzon, 2016) Biological Transformations in the P Cycle  Mineralization/immobilization o Mineraliza...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 30: Buffer Solution, Denitrification, Urease
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AGR 2320 – Lecture 30 – Nitrogen (cont’d) and Phosphorous Denitrification  Nitrate N is converted biochemically by mainly heterotrophic bacteria to N O2or N g2s  Most often in anaerobic environments ...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 29: Soil Organic Matter, Soil Ph, Corn Stover
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AGR 2320 – Lecture 29 – N-fertilizer Amount of N-Fertilizer VS Organic N-Fertilizer  The amount of fertilizer-N required in a given year is dependent on the inputs of inorganic-N from other sources, the de...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 28: Nobel Peace Prize, World War I, Nitrogen Cycle
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AGR 2320 – Lecture 28 – Major Nutrient Cycles and Nutrient Management Essential Plant Nutrients  Macro- vs micronutrients  Macronutrients (needed in large quantities) o C, H, O o N...

Agriculture
AGR 2320
John Lauzon
AGR 2320 Lecture Notes - Lecture 27: Microfauna, Annelid, Mollusca
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AGR 2320 – Lecture 27 – Soil Organisms Main Types of Organisms  Heterotrophs: Carbon from Organic material o Herbivores subsist on living plants o Detritivores subsist on dead plants ...

Agriculture
AGR 2320
John Lauzon

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