Certified Crop Advisor- Soil and Water
Management Exam. 81 Questions With 100%
Correct Answers 2024.
Which of the following is negatively charged?
anion
Cations are held on the CEC by _____ charges on clay and organic matter .
Positive
Which of the following clays contributes most to CEC if the same amount of each clay is present ?
montmorillonite
Potassium fixation occurs when which of the following clays is present in soil ?
Illite
If a soil has an EC of 0.6 siemens meter and contains 20 percent sodium on the CEC , it is a
_________soil .
saline - sodic
What is the textural class of soil that is 10 percent clay and 35 percent sand ?
Silt Loam
Which of the following increases as a soil's clay content increases ?
Surface Area
Which of the soil textures listed below has the highest porosity and lowest bulk density ?
Clay
The maximum value for plant available water is_____________.
The difference field capacity and wilting point
Which of the following textural classes has the largest potential available water ?
silt loam
Which kind of soil structure would be typical for a good seed bed ?
Granular
Soil structure modifies the physical properties of soil_____________.
Texture
, Good structure in the subsoil improves ________________.
root elongation
Soil microorganisms cause_________ in soil structure when crop residues are added to soil .
Increases
The bulk density of 100 cm³ of dry soil that weighs 145 g is_______ g / cm³ .
1.45
Which of the following soil textures has the greatest % porosity ?
clay
Which of the following can decrease bulk density ?
incorporating compost
In a typical row crop production system , most of the soil organic matter originates from_________.
crop residues
The stable form of soil organic matter is called______________.
humus
When organic materials decompose , most of the C ends up as ________________.
CO₂
Which of the following is not an example of a contribution of soil organic matter to soil properties ?
increased molybdenum availability
Soil organic matter is a source of ___________for crops .
nitrogen potassium
In order to increase soil organic matter levels , _____________must be markedly reduced or
eliminated .
weed control
Which of the following is most important in carbon sequestration ?
Reducing tillage
Which of the following favors increased soil microbial activity ?
increase in soil water content from 20 to 40 percent of water holding capacity
Which of the following organic materials would be expected to mineralize the most nitrogen
dairy manure
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ACADEMICAIDSTORE. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £9.19. You're not tied to anything after your purchase.
