6 in the 100ml graduated cylinder which sediment will

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6. In the 100mL graduated cylinder, which sediment will settle out of suspension first and sink to the bottom? Why?
7. In the 100mL graduated cylinder, which sediment will settle out of suspension last? Why?
8. Define soil porosity.
Use the soil pyramid below to answer the following questions. 9. A student finds that his soil has 40% sand, 40% silt, and 20% clay. What soil texture does this student have?
10. A student finds that his soil has 10% sand, 30% silt, and 60% clay. What soil texture does this student have?
PROCEDURE SOIL NUTRIENT LAB
Four variables are important in determining the fertility of soils. They are: pH, and the amounts of nitrogen, phosphorous, and potassium. The values of each of these components can serve as a limiting factor in the growth of plants. 1. Fill a 250mL beaker with 50mL of water. 2. Fill a 25mL test tube with 10mL of your soil sample. 3. Pour the soil sample into the water and mix thoroughly. Let the sample settle for at least 30 minutes. 4. Fill the phosphorus test vial to the dotted line with the soil/water mixture. 5. The vials have color-coordinated capsules that coordinate with each test. Find the correct color capsule and carefully separate it. Pour the powdery contents into the vial and mix thoroughly with the water. Cap and shake until all of the powder has dissolved. 6. Wait 5 minutes until a color develops. 7. Use the color indicator to determine the amount of phosphorus and record in the table below. 8. Repeat with pH, nitrogen, and potassium tests. Soil Nitrogen Phosphorus Potassium pH Soil Nitrogen Phosphorus Potassium pH adequate adequate sufficient neutral (7) SOIL POROSITY LAB Porosity is the amount of air space in a soil sample. Porosity is important because it determines the ease with which water, oxygen, and nitrogen can work their way down to the root zones of plants. The creation of aquifers also depends on the pore space between soil particles. To determine the porosity of your soil, fill a 100 mL beaker to the 50 mL mark with dried soil and tamp down gently. Fill a 50 mL graduated cylinder to the 50 mL mark with water. Gently pour the water onto the surface of the soil until the soil is completely saturated and water just starts to pool up on the surface. Measure the amount of water left in the graduated cylinder. The amount used is the amount of pore space in your sample.

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