Colloids
This type of colloid is found primarily in highly weathered soils of the tropics.
What are Al/Fe oxides?
This is a target pH as it is best for most plants.
What is 6.5-6.8?
This type of organism is opportunistic and has a burst of activity when fresh organic matter is added to soil.
What are zymogenous organisms?
This is a means of maximizing biodiversity.
What are crop rotation / IPM / pollinator plantings / cover crops / agroforestry / crop-livestock integration?
They signify how much N, P and K there is in a fertilizer.
What do the 3 numbers that are on bags of fertilizer represent?
This type of soil colloid has the highest CEC.
What is humus?
The ratio of H+ to OH- ions.
What determines soil pH?
These are the 2 laboratory means of assessing soil organic matter.
What are loss-on-ignition and wet oxidation?
The primary soil health principle this management strategy helps is reducing disturbance.
What is no-till?
This macronutrient is especially pH sensitive since it will become bound to different elements at too high or too low of pH.
What is phosphorus?
A 1:1 crystalline silicate clay that works well for pottery since it does not shrink/swell.
What is kaolinite clay?
You might add this if you have very high pH soils.
What is elemental sulfur?
These 3 elements make up 90% of plant dry matter.
What are C, H and O?
This can help to decrease soil erosion.
What is mulching?
This area of the plant is where you would expect to see deficiency symptoms if a limiting nutrient is mobile within the plant.
What are the lower leaves?
These are the two types of sheet structures in crystalline silicate clays.
What are tetrahedral and octahedral sheets?
These are the three primary basic cations looked at when determining percent base saturation.
What are Mg2+ and Ca2+ and K+?
This is the type of worm that would be best for vermicomposting since it stays in the surface litter.
What is an epigeic worm?
This is a type of organic matter that you can apply that is highly recalcitrant with high WHC and NHC.
What is biochar?
Root interception, mass flow and diffusion.
What are the means of uptake of nutrients from the soil by roots?
This type of colloid is pH dependent as to whether it attracts more cations or more anions.
What are noncrystalline silicate clays?
You would add this type of limestone if you also had a magnesium deficiency.
What is dolomitic limestone?
What are C:N, lignin and polyphenols?
This is when there is an initial drop in soil humus after fresh residues are added.
What is the priming effect?
These are the two bacteria responsible for nitrification.
What are Nitrosomonas and Nitrobacter?