Chapter 37 notes

Chapter 37 notes - 6/13/11 Availability of Mineral Ions...

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Click to edit Master subtitle style 6/13/11 Chapter 37 Soil and Plant Nutrition
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6/13/11 Concept 37.1: Soil is a living, finite resource In addition to climate, texture and composition of soil are major factors determining the distribution of plants
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6/13/11 Texture & Composition of Soils Soil is made up of particles derived from the breakdown of rocks (minerals) along with organic material (humus) Texture: the relative amounts of various sizes of soils particles Composition: relative amounts of inorganic and organic components
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6/13/11 Soil Soil horizons are visible in vertical profile “A” horizon is a mix of humus and Figure 37.2
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6/13/11 Availability of Water After rains, smaller spaces in the soil retain water because of H-bonding with clay and other particles Film of loosely-bound water is available to plant roots Not all the soil water can be extracted by the plant
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Unformatted text preview: 6/13/11 Availability of Mineral Ions Many cations are attracted to negatively charged soil particles Cation exchange is a process that contributes to their uptake Plants decrease the pH of the soil fluid The H+s in the fluid are exchanged for the mineral cations bound to the soil particles Figure 37.3 6/13/11 Leaching Removal of nutrients from soil by water that percolates through it Most pronounced in sandy soils 6/13/11 Clicker Question Which soil mineral is most likely leached away during a hard rain? Na+ K+ Ca++ NO3-6/13/11 Clicker Question Where did most of the dry mass of this tress come from? 6/13/11 Concept 37.2: Plants require essential elements to Plants derive most of their organic mass (biomass) from the CO2 in the air CO2 for photosynthesis diffuses into leaves through stomata...
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Chapter 37 notes - 6/13/11 Availability of Mineral Ions...

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