TAILIEUCHUNG - Soil pH and Organic Matter

An inert gas is bubbled through a 5 mL water sample contained in a specially-designed purging chamber at ambient temperature. The purgeables are efficiently transferred from the aqueous phase to the vapor phase. The vapor is swept through a sorbent trap where the purgeables are trapped. After purging is completed, the trap is heated and backflushed with the inert gas to desorb the purgeables onto a gas chromatographic column. The gas chromatograph is temperature programmed to separate the purgeables which are then detected with a mass spectrometer | 8 Nutrient Management Module No. 8 Soil pH and Organic Matter by Ann McCauley Soil Scientist Clain Jones Extension Soil Fertility Specialist and Jeff Jacobsen College of Agriculture Dean MONTANA STATE UNIVERSITY Extension Nutrient Management Introduction This module is the eighth in a series of Extension materials designed to provide Extension agents Certified Crop Advisers CCAs consultants and producers with pertinent information on nutrient management issues. To make the learning active and to provide credits to Certified Crop Advisers a quiz accompanies this module. In addition realizing that there are many other good information sources including previously developed Extension materials books web sites and professionals in the field we have provided a list of additional resources and contacts for those wanting more in-depth information about soil pH and organic matter. This module covers the following Rocky Mountain CCA Nutrient Management Competency Areas with the focus on soil pH and organic matter soil reactions and soil amendments and soil test reports and management recommendations. Objectives After reading this module the reader should 1. Know what soil pH is and how it is calculated 2. Understand how soil pH affects nutrient availability in the soil 3. Learn techniques for managing soil pH 4. Know the processes of soil organic matter cycling 5. Understand the role of soil organic matter in nutrient and organic carbon management 4449-8 May 2009 Background As noted throughout Nutrient Management Modules 2-7 soil pH and organic matter strongly affect soil functions and plant nutrient availability. Specifically pH influences chemical solubility and availability of plant essential nutrients pesticide performance and organic matter decomposition. Although soil pH is relatively similar in Montana and Wyoming pH 7-8 it is known to vary from to causing considerable fertility and production problems at these extremes. Therefore to understand plant nutrient

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