Soil amp; Solless Media土壤amp；无土介质.pptVIP

Lab 1 Soils Soil-less Media TODAY: Background Information Soil Survey (handout; 10 points) What Is Soil?How Is Soil Formed? Definition A natural, 3-dimensional body at the earth’s surface. It is capable of supporting plants and has properties resulting from the integrated effect of climate and living matter acting on earthy__________________________, as conditioned by _______________________over periods of time. 5 soil forming factors (Hans Jenny, 1941) - Climate - Time - Parent Material - Organisms - Topography/Relief (lay of the land) What’s So Important About Soil? Medium for growth - anchorage for roots Supplies conditions required for growth ______________________ Stored in pore spaces Nutrients/minerals Bound to soil particles, from decomposition of soil minerals _____________________ for respiration Stored in pore spaces Soil Ecosystem “Too many people have lost sight of the fact that productive soil is essential to the production of food.” “Take care of the land and the land will take care of you.…” – Hugh Hammond Bennett What Makes An Ideal Garden Soil? It should be… ____________________- root growth and nutrient extraction ____________________ - a perfect balance of texture (often a loam) Friable = Easy to work, crumbly High in organic matter - 3-5% OM Well drained/aerated - balance of soil solution and oxygen Fertile - optimum ________________ and pH levels (6.2-6.8) What is Soil Texture? Why Does Soil Texture Matter? How to Determine Soil Texture Field Tests _________________ tests - various methods by which general soil texture classes can be gauged _________________ separates - determine proportion of sand, silt, and clay by allowing size separates to settle differentially in a water solution Soil References Soil textural triangle Soil surveys Soil Textural Triangle Soil Surveys Federal, Regional, State, Local Partnership Investigate, inventory, document, classify, interpret soils Disseminate, publish, promote t