5
Lecture 3 focuses on choosing the right assessment tool in order to ascertain the specific information you wish to know about your soil. You will learn that some assessment methods are more effective and reliable than others. This lecture continues to explore soil chemistry and how to accurately assess and measure soil chemistry and biology; accurate measures and assessment are fundamental prerequisites to be able to prescribe appropriate remedial treatments and adjustments.
A Video for all you Cannabis growers out there that goes over some of what is discussed here in this post. Scott is a notable Soil Food Web Graduate. Since of course Cannabis is the most popular cash crop out there.
This Lecture was very information dense. A lot of what I took notes on here was not necessarily important for passing the quiz. However, still is needed to know and important to understand when approaching future projects/ growers who depend on the information from these soil tests that are conducted. If you have been following along you will have remembered that it is all about balancing out our fungal:Bacteria levels more so than not in our soils.
Plate Counts
Used to determine numbers of individuals of one or more species or genus.
Shadow Microscopy
Used to determine Organism Biomass. Used for soil analysis.
CO2 absorption
Used to determine Organism Activity
CO2 absorption + Enzymes
Add food or not?
Chloroform Fumigation
Used to determine Organism Numbers
Haney Test
Used for Nutrient cycling
Physical Properties | Chemical Properties | Biological Properties |
---|---|---|
Bulk density | Soil reaction of pH | Organic matter content |
Rooting depth | Electrical conductivity | Microbial biomass carbon |
Water infiltration rate | Cation exchange capacity | Microbial biomass nitrogen |
Aggregate stability | Organic matter | Earthworms |
Surface and sub-surface hardness | Mineralizable nitrogen | Enzymes |
- | Exchangeable potassium | Disease suppressiveness |
- | Exchangable calcium | Active Carbon |
Cation Exchange Capacity (CEC) is a measure of the ability of all surfaces such as but not just sand, silt, clay and organic matter surfaces to hold and release cations.
Ability of a soil to hold and exchange cations
Is the total amount of cations that a soil can retain
The higher the soil CEC the greater ability it has to store plant nutrients.
Soil CEC increases as the amount of clay increases, amount of organic matter increases and when the soil pH increase.
Proteins (organic matter) have CEC. Can hold nutrients.
pH is Hydrogen and Hydroxide ion concentration
Alkaline = higher concentration of hydroxide
Acidic = higher concentration of hydrogen
As you add more hydroxide that hydroxide binds with the hydrogen ion and takes hydrogen ion out of solution so now you might have water instead.
is the Percentage of the soil exchange sites (CEC) occupied by the four particular cations, potassium (K+), Magnesium (Mg to the +2 power), calcium (Ca to the +2 power) and Sodium (Na+)
Ca:Mg affects the way Clay platelets arrange themselves: collapsed, flocculated, dispersed.
This Lecture was extremely frustrating. But fortunately the Quiz was not that hard. Watching the lecture over and over again was very very helpful!
Let's see how I did with the Quiz. I do not expect to do well with this lecture quiz.
Comments:
Reply:
To comment on this video please connect a HIVE account to your profile: Connect HIVE Account