Use the soil textural triangle to name the following soils by its correct texture class. 2. 20% sand, 25% silt, 55% clay: 3. 29% sand, 59% silt, 12% clay 4. 60% sand, 15% silt, 25% clay: 5. 15% sand, 48% silt, 37% clay: Determine the percentage of each particle size for 6 through 9 examples plotted on the triangle (the values of sand, silt, and clay should equal 100%). 6. % sand % silt _%clay 7. % sand % silt _%clay % sand % silt _%clay 9. % sand % silt % clay 8. 100 10 90 20 80 70 30 clay 40 percent clay 60 50 percent silt silty day 09 day loan silty cay lÃ³am 70 50 40 sandy clay 30/sandy day loam 20 sandy loam 10 Joamy sand sand 80 loam silt loam 90 silt 100 10 100 percent sand A less quantitative way of determining a soil’s texture would be to estimate the percentages of sand, silt, and clay using the soil shake test. Using the soil filled jar in Part A #1, and using this video link as your guide, perform your own Soil Shake Test. Based on your results and calculations PLOT your soil on the Textural Triangle on page 3 and label your soil “X” Soil Shake Test Write the NAME of you soil here: Clay Take a picture of your far of soil when the soil has settled and upload it with your lab submission Silt Sand Soil Settled Soil Soil and Part C-Porosity and permeability Sample Water Mix Soil texture affects the movement of water through the soil, and therefore, the amount of water available to plants.
Poorly graded (clean) coarse sandy soils tend to have relatively large voids (pore spaces) between them that are well connected, allowing the water to move through the soil quickly. The small particles in clay soils fit closely together, leaving voids (pore spaces) between them that are relatively small and not well connected. Water in clean clay soils moves through rather slowly and is held tightly by individual clay particles through adhesion, limiting the amount of water available to plants. Texture and compaction of the soil influences pore space volume or porosity. The property of the soil that determines the RATE that fluid passes through pore spaces is known as permeability and is an indication of how interconnected pore spaces are POROSITY PERMEABILITY Pore Space in Bandy Bols. Clay Sol Sandy Sol Clay Sot Sand OVS Larger por Lessol por von Less presy à®¤à®¾à®¯à®¾à®© pores Greater total por volume Greater por High Medium Low Click on this video link to observe permeability rates through well sorted (clean) gravel and sands and for a discussion on the relationship between porosity and permeability. 10. What is the relationship between the following of a mostly sandy soil vs. a mostly clayey soil? a. Porosity and grain size: b. Permeability and grain size: C. Porosity and permeability:
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