Week 4_Soil Chemical Properties_Dialogue-2

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Feb 20, 2024

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Hort Science_AGOR 1 Soil Chemical Properties Dialogue Name: Instructions Review and preview the original format of this document in the Canvas module. The original numbering and charts need to stay in place. Do not delete anything from this document. Add in your short answer responses and highlight/bold multiple choice. Highlight or bold all text inputted into this document. Answer all questions and fill in all definitions. Save this document in a folder on your PC, so you have them for reference. When submitting the worksheet  Word Documents or PDF file format only  You may type/edit your responses and save them as Word or PDF  You may print out this document, clearly write in the answers, scan it, and save it as a PDF. After submitting, check your upload to be sure you have submitted the correct file. Grading Score Criteria 20/20 points All answers are complete and accurate with appropriate grammar. 15/20 points Missing/incorrect on 1-2 questions/definitions, or incomplete sentence(s), or modifying the format of this document in numbering or highlighting or bolding. (Complete sentences include capital letters, subject, predicate, and a period. Do not forget basic grammar, including capitalizing "I" when typing in the first person) 0-10/20 points Missing/incorrect on 5 more questions/definitions, or incomplete sentence(s), or modifying the format of this document in numbering or highlighting or bolding. 0 points Late, no submission, or or the wrong file uploaded

Hort Science_AGOR 1 Soil Chemical Properties Dialogue Name: Term Definition CEC A measure of soil's ability to retain fertility (cationic forms of plant-essential elements); the sum of exchange able cations absorbed by a soil, expressed in milliequivalents per 100 g of soil equivalent to the milligrams of H+ that will combine with 100 g of dry soil Saline soil A soil containing sufficient soluble salts to impair plant growth and development. Sodic soil A soil that contains sufficient sodium to adversely affect its physical properties and water infiltration; a soil with an exchangeable sodium percentage greater than or equal to 15% Soil pH Describes the relative acidity or alkalinity of a solution. Base Cation Saturation Ratio (Use the lecture for this one) Generally move the ph closer to neutral and alkaline/ basic (in order) Ca,Mg,K,Na Vocabulary 1. This is the fourth time around doing vocabulary. You probably have the hang of it now. This is a short but mighty vocab list! a. None of your lists are short. b. Short and mighty, like Mighty Mouse? (google this, I am probably a little older than you…)

Hort Science_AGOR 1 Soil Chemical Properties Dialogue Name: The Text! Let’s Talk 2. Cation Exchange Capacity (CEC) is a fancy, fancy term. I never need to use it unless I am reading a soil report. If a soil has a low CEC, it’s most likely a sandy soil. If a soil has a high CEC, it is probably a clay soil or very high in organic matter. Read the Cation Exchange Capacity section on page 44, and you will find this sentence below. Fill in the blanks. When cation exchange occurs, the ____ cation____ released from the ____ clay mineral ___ into the soil solution becomes available for absorption by plant roots. 3. Read the Cation Exchange Capacity section on page 44 again. You don’t have to but it’s a good suggestion… Which of the following statements is false regarding CEC? a. CEC measures the amount of cations that can be adsorbed or held by a soil b. It is measured in units of milliequivalents per 100 grams of soil c. Mineral soils with a higher cation exchange capacity are usually more fertile than those with a lower exchange capacity because the former more effectively resist the loss of the plant nutrient cations through the leaching process. d. Clay particles attract negatively charged plant nutrient ions, such as nitrate and sulfate. e. The amount and kind of clay in soils are critical factors in plant growth because of the clay’s capacity to adsorb cations is important in plant nutrition. 4. Read the Cation Exchange Capacity section on page 44: Clay minerals have a low affinity for water. a. True b. False 5. Read the Cation Exchange Capacity section on page 44, you know, for the fourth time. You’ll want to find each of the sentences below within the text and identify the false statement. Which of the following statements is false? a. The negative charges on the clay minerals attract the positive charges on the hydrogen(H+) ions in water(H2O). b. Montmorillonite clay, commonly found in CA, swells greatly when wetted and shrinks when dry, leaving wide cracks. c. An intermediate amount of clay in a soil (loamy texture) improves its capacity to hold water and plant nutrient ions because of the negative charges on clay minerals’ surfaces and the large surface area associated with clay particles. d. A clay soil has almost 100,000 times more surface area than a soil of fine sand grains of the same weight e. As soil particles become smaller and smaller (from gravel to sand to silt to clay), the soil has more surfaces available for chemical reactions to occur f. All of the above statements are TRUE

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