SOIL 3600 Lecture Notes - Lecture 25: Vermiculite, Nitrobacter, Illite

• School: University of Manitoba
• Department: Soil Science
• Course: SOIL 3600
• Professor: Tee Boon Goh

Document Summary

Draw the simplified nitrogen cycle - "a simplified n-cycle, focused on the internal, soil-n cycle" From left to right - mineralization: conversion of organic n to mineral n (there are 2 forms of mineral n - ammonium(+), nitrate. First product of mineralization (from organic) - ammonium (ammonification) Clay (-ve: plant uptake as a nutrient if the ammonium could be exchanged by cation exchange, loss by leaching - in sandy soils. Inject deep enough so that id does not diffuse into atmosphere: would not apply on surface. Inject deep (ex, 3 inch) and under moist conditions: why, nh3 + h2o -> nh3 * n2o - or - nh4oh - or - nh4 + oh- Oxidation of nh4 to nitrate, no3: oxidation = increase in oxidation number. Nh4+ + 2o2 --> no3- + 2h+ + h20 + 425 kj: use both bacteria, 425 - 74, note then, the second step occurs almost immediately.