Exam 3 Notes

10 o

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 02/03/2014 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

Ask a homework question - tutors are online