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Lessons - Soils Home Study Course Soils - Part 10: The Scientific Basis for Making Fertilizer Recommendations   The Scientific Basis for Making Fertilizer Recommendations: In this lesson, you will gain an understanding of the history of fertilizer use and the ideas behind fertilizer recommendations. Three major crop nutrition concepts will be discussed in terms of their benefits and disadvantages. [This lesson, as well as the other nine lessons in the Soils series, is taken from the "Soils Home Study Course," published in 1999 by the University of Nebraska Cooperative Extension.] View Print Take Quiz Soils - Part 1: The Origin and Development of Soil (How Soil Gets a Life and a Name) View Print Take Quiz Soils - Part 2: Physical Properties of Soil and Soil Water View Print Take Quiz Soils - Part 3: Soil Organic Matter In this lesson, you will learn such terms as organic, soil organic matter, nutrient, decomposition, humus, compost, and soil structure. In addition, you will be able to predict the effect of land uses... View Print Take Quiz Soils - Part 4: Soil pH Soil pH is defined and its implications for crop production are described in this lesson. How are soil pH and buffer pH determined? How are these assessments used in lime recommendations? The factors ... View Print Take Quiz Soils - Part 5: Nitrogen as a Nutrient In this lesson, you will be able to describe the forms of nitrogen found in the soil. The nitrogen cycle and how nitrogen is lost in the environment will be thoroughly discussed. Forms of nitrogen uti... View Print Take Quiz Soils - Part 6: Phosphorus and Potassium in the Soil This lesson explains the importance of phosphorus fixation and describes methods for applying phosphorus and the advantages (and disadvantages) of each. It also describes the three forms of potassium ... View Print Take Quiz Soils - Part 7: Soil and Plant Considerations for Calcium, Magnesium, Sulfur, Zinc, and other Micronutrients The 16 essential elements for plant growth and the relative quantities of each needed by plants to grow normally will be discussed in this lesson. You will learn to identify the source of specific nut... View Print Take Quiz Soils - Part 8: Characteristics of Fertilizer Materials The various characteristics of fertilizer materials being sold on the market today will be discussed. You will learn to identify some of the consequences of using each type of fertilizer material and ... View Print Take Quiz Soils - Part 9: Fundamentals of Soil Testing The major emphasis in this lesson is soil testing and understanding the procedures needed to take a representative soil sample. You will understand the term variability, how it affects soil tests, and... View Print Take Quiz Total: 10

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This project was supported in part by the National Research Initiative Competitive Grants CAP project 2011-68002-30029 from the USDA National Institute of Food and Agriculture, adminstered by the University of California-Davis and by the National Science Foundation (NSF), Division of Undergraduate Education, National SMETE Digital Library Program, Award #0938034, administered by the University of Nebraska. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the USDA or NSF.
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