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Approximately what proportions of the pore space should be occupied by air and water when a soil is at an optimum condition for plant growth? Expląin.

Approximately what proportions of the pore space should be occupied by air and water when a soil is at an optimum condition for plant growth? Expląin.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Homework questions 1. Which soil will usually have the higher porosity, a sandy soil or a clay soil? Why? 2. How would the compaction of a soil with a bulk density value of 1.3 grams per cubic centimeter to a bulk density value of 1.8 grams per cubic centimeter affect water flow into the soil and plant growth? Explain. 3. Approximately what proportions of the pore space should be occupied by air and water when a soil is at an optimum condition for plant growth? Explain.
Transcribed Image Text:Homework questions 1. Which soil will usually have the higher porosity, a sandy soil or a clay soil? Why? 2. How would the compaction of a soil with a bulk density value of 1.3 grams per cubic centimeter to a bulk density value of 1.8 grams per cubic centimeter affect water flow into the soil and plant growth? Explain. 3. Approximately what proportions of the pore space should be occupied by air and water when a soil is at an optimum condition for plant growth? Explain.
Soil Lab 11a Direct Measurement of Soil Porosity 1. Fill a 100 ml graduated cylinder to the 100 ml mark with tap water. Tilt the beaker containing the soil sąved from Step 3 in the Bulk Density Determination to about a 45 degree angle. Pour the water very slowly onto the soil in the beaker. Stop adding water when the soil pores are filled (saturated) and the soil surface glistens. 2. Allow the soil to stand for several minutes to make sure the water has filled the very small soil pores. Any excess water can be returned to the graduated cylinder. Don't stir or shake the mixture. 3. Determine the amouht of water used to exactly fill the pote space in the 100 cubic cehtimeters of soil. Subtrąct the reading of water level on the side of the graduated cylinder from the original volume of 100 ml. Note that the water which was poured onto the soil exactly filled the pore space and thus equals the total pore volume by direct measurement. 4. Record your results below and make the necessary calculations. Be sure to show formula and complete setup and units. 5. Repeat steps 1 though 4 with the other soil. Porosity Data: Soil Initial volume of water in cylinder (ml) Volume of water remaining in Cylinder (ml) Volume of water filling soil pores (ml) Total Volume of Soil (cubic centimeters) Porosity % from direct measurement
Transcribed Image Text:Soil Lab 11a Direct Measurement of Soil Porosity 1. Fill a 100 ml graduated cylinder to the 100 ml mark with tap water. Tilt the beaker containing the soil sąved from Step 3 in the Bulk Density Determination to about a 45 degree angle. Pour the water very slowly onto the soil in the beaker. Stop adding water when the soil pores are filled (saturated) and the soil surface glistens. 2. Allow the soil to stand for several minutes to make sure the water has filled the very small soil pores. Any excess water can be returned to the graduated cylinder. Don't stir or shake the mixture. 3. Determine the amouht of water used to exactly fill the pote space in the 100 cubic cehtimeters of soil. Subtrąct the reading of water level on the side of the graduated cylinder from the original volume of 100 ml. Note that the water which was poured onto the soil exactly filled the pore space and thus equals the total pore volume by direct measurement. 4. Record your results below and make the necessary calculations. Be sure to show formula and complete setup and units. 5. Repeat steps 1 though 4 with the other soil. Porosity Data: Soil Initial volume of water in cylinder (ml) Volume of water remaining in Cylinder (ml) Volume of water filling soil pores (ml) Total Volume of Soil (cubic centimeters) Porosity % from direct measurement
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