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Unformatted text preview: Prevents packing of smaller
mineral particles and allows retention of water Availability of Water
o After rains, smaller spaces in the soil retain water because of Hbonding with clay and other particles
o Film of looselybound water is available to plant roots
o Not all the soil water can be extracted by
the plant Availability of Minerals
o Many cations are attracted to negatively 31
charged soil particles o 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 be the soil particles Figure 37.3 Leaching
o Removal of nutrients from soil by water that percolates through it Most pronounced in sandy soils Clays are best at holding onto nutrients Concept 37.2: Plants require essential elements to complete their lifecycle 32 Pants derive most of their organic mass (biomass) from the CO2 in the air
Also need soil nutrients like water and minerals Essential Plant Elements
o Essential element: element required by a plant to complete its lifecycle
o Macronutrients: required by plants in relatively large am...
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This note was uploaded on 02/03/2014 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.
- Spring '08