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Soil Genesis and Development, Lesson 1 - Rocks, Minerals, and Soils
This lesson identifies some common rocks and minerals and how they influence soil formation.
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Soil Genesis and Development, Lesson 2 - Processes of Weathering
This lesson identifies the factors of weathering processes and how they influence soil formation.
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Soil Genesis and Development, Lesson 3 - Soil Forming Factors
This lesson identifies the five major soil forming factors and discusses how they influence soil development.
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Soil Genesis and Development, Lesson 4 - Soil Profile Development
This lesson discusses the processes controlling soil formation and how these processes relate to the characteristics of a soil profile.
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Soil Genesis and Development, Lesson 5 - Soil Classification and Geography
This lesson discusses the characteristics of the 12 soil orders defined by the USDA soil classification system, the major factors involved with their formation, and their geographic distribution acros...
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Soil Genesis and Development, Lesson 6 - Global Soil Resources and Distribution
This lesson discusses soil resources and functions at the global scale.
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Soils - Part 1: The Origin and Development of Soil
(How Soil Gets a Life and a Name)
Soil means different things to different people. To some, soil is something that must be swept away; to others it is just a material that sticks to your shoes. In both instances, soil is associated wi...
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Soils - Part 2: Physical Properties of Soil and Soil Water
Soil may look simple; however, it is an extremely complex system. It
is most often described by its physical, chemical and biological
properties and processes. Soil is organic or inorganic; inert or...
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Soils - Part 3: Soil Organic Matter
To most gardeners, organic matter is like Husker football—everybody
is a fan, but not everybody understands the details of the game. Anyone
who uses a soil should have an interest in its organ...
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Soils - Part 4: Soil pH
Soil pH is one of the most important chemical characteristics of the
soil. For example, soil pH can affect availability of plant nutrients.
In addition, the soil pH can affect the performance of pre...
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Soils - Part 5: Nitrogen as a Nutrient
Nitrogen (N) is one of the most abundant elements on earth, and
after carbon (C), hydrogen (H), and oxygen (O), it’s the element living
creatures need most. The atmosphere over each square foo...
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Soils - Part 6: Phosphorus and Potassium in the Soil
Phosphorus fertilizers are second only to nitrogen in importance for
growing crops in Nebraska; however, the principles affecting efficient
phosphorus use are totally different. Nitrogen is a mobile...
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Soils - Part 8: Characteristics of Fertilizer Materials
During the first seven lessons, we have discussed a variety of
topics related to soils, ranging from their formation to how nitrogen
reacts in the soil. In Soils - Part 8, we are going to shift
gea...
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Soils - Part 9: Fundamentals of Soil Testing
Soil tests are part of a four-step process of determining and providing nutrients to agronomic crops. The four steps are:1) soil sampling,2) soil analysis,3) result interpretation and decision making,...
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