1 Name: Period: Date: PHYSICAL AND CHEMICAL PROPERTIES OF SOIL INVESTIGATION ROTATION OVERVIEW: Physical and Chemical Properties Properties 1. physical properties a soil horizons b soil color c soil texture 2. chemical properties a soil ph b nutrients STATION 1 Sediment Sorting (Texture Physical Property) 1. Make sure the soil sieve is stacked in the correct order, with 1 on the top. 2. Pour in the entire soil sample. 3. With a hand on the bottom and a hand on the top part, shake the sieve. 4. After about a minute of shaking, open up each section, ONE AT A TIME. Do this over the bin that the soil was stored in. 5. Use the grain size chart to determine what size sediment is in each section. (HINT: The sediments smaller than 1 mm will need to be deternmined by feel. ) Use the part that is highlighted in red.
2 Sieve number 1 Sediment Name (Qualitative) C Sediment Size Sieve number 1 Sediment Name (Qualitative) D Sediment Size STATION 2 Color (Color Physical Property) BACKGROUND: color is typically described using some form of color reference chart, such as the Munsell Color Chart. Using the Munsell system, color is described in reference to the color s hue, value, and chroma. a. Hue describes the specific color of soil, or where in the color spectrum the soil color exists, which for soils includes the colors yellow, red, blue, green, and gray. b. Value describes how light or dark the color of soil is. c. Chroma indicates how intense the color of soil is. In a Munsell notation, the color is written in the order hue-value-chroma. The color 5YR 4/3 is an example of a Munsell notation, where 5YR is the hue, 4 is the value, and 3 is the chroma. 1. Observe one sample at a time. Put a small amount of soil in the petri dish.
3 2. Flip through the Munsell pages and find the best matching chip. There are holes next to each color so you can see the soil right next to the color chip. 3. Once you have found the color, find the exact same spot on the gray page next to it. This spot will give you a color name (hue). 4. There are also numbers. They refer to value and chroma. 5. Record these observations and include pictures. Picture of and Munsell Chip Color Name (Hue) (Qualitative) Color Value Color Chroma A B
4 STATION 3 Chemistry (ph and Nutrients Chemical Properties) 1. Read ALL directions and SAFTEY information first. They are enlarged copies from the actual testing kits. - The most important parts have been highlighted. 2. Pick TWO tests to complete. Circle the ones you picked in the table below. 3. Follow the provided directions and record your results. Tested for (circle one): Resulting Color (Qualitative) Resulting Number What does this mean for the soil? (Use provided sheet.) nitrogen (N) phosphorus (P) potassium/p otash (K) ph (how acidic/basic ) nitrogen (N) phosphorus (P) potassium/p otash (K) ph (how acidic/basic ) 1. Use the dissection scopes to examine the soil. 2. Examine the soil for evidence of weathering. 3. Use the grain size chart to determine how rounded the sediments are. Use the parts boxed in red. è è è 4. Examine the soil for evidence of organic matter. 5. Take a picture and include it below. STATION 4 and 5 Take a Closer Look ( Formation)
5 F How rounded? (Evidence for Weathering) Evidence of Organic Matter Image G How rounded? (Evidence for Weathering) Evidence of Organic Matter Image STATION 6 and 7 Texture (Texture Physical Property) 1. Use the flow chart to determine the texture of each soil sample. 2. Follow each arrow until you determine the best fit for your soil. H I claim soil sample H is classified as I claim this because (give the details from the flow chart that helped you determine the soil texture classification) I I claim soil sample I is classified as I claim this because (give the details from the flow chart that helped you determine the soil texture classification)