Course talk:APBI200

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How do I calculate Volume of Soil Pores in Problem 3 part A question C?


Thread titleRepliesLast modified
Practice Exam114:34, 26 April 2019
Will the last classes be covered the final?114:42, 25 April 2019
final exam question114:34, 25 April 2019
Practice exam114:29, 25 April 2019
review session103:25, 24 April 2019
Final exam and review sessions - Room change for April 26201:32, 24 April 2019
session 3 group 5 question103:56, 23 April 2019
organic matter100:23, 23 April 2019
Midterm questions and answers116:26, 22 April 2019
Midterm #1 questions116:25, 22 April 2019
Midterm #2 questions016:21, 22 April 2019
problem set 3 grade117:19, 21 April 2019
Final exam 202:54, 16 April 2019
discussion session 3 group 2101:27, 15 April 2019
Point form101:25, 15 April 2019
Are we going to have calculation questions in the final exam?121:46, 14 April 2019
What is covered in the final?114:33, 14 April 2019
Lecture Notes114:32, 14 April 2019
difficulty of two exams122:11, 13 April 2019
Lab assignments and problem set 3120:08, 13 April 2019
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Practice Exam

Hello, I was wondering where we can get answers for the practice exam. Thank you.

21:32, 25 April 2019

Hi ChaeHyun - we do not post answer keys due to past issues with online circulation and plagiarism. If you have a specific questions we are always happy to answer.

14:34, 26 April 2019

Will the last classes be covered the final?

Will any of the materials we did in the last several classes of the semester be covered in the final? Materials such as water erosion, wind erosion, soil erosion... etc.

Cheers, An Hoang

14:36, 25 April 2019

The last classes covered urban soils, soil degradation (i.e. erosion), the practice exam and a "fun" review.

The practice exam, and many of the review questions (from Soil Science Trival Pursuits) are extremely relevant. For urban soils, consider the key constraints imposed by the urban environment such as compaction and rooting depth; but understand that the soil processes are the same. For soil degradation, we focused on water erosion as it is a major process in agricultural and forestry landscapes - a basic understanding of the processes and impacts is sufficient.

14:42, 25 April 2019

final exam question

is it necessary to remember the salinity classification? Since in problem set 3 #3 question, we need to remember the data such as ESP is smaller than 15 is saline.

00:27, 25 April 2019

It is useful to know the major breaks Zhifang, for example when interpreting data. For example EC >4 dS/m indicates salinity.

14:32, 25 April 2019

Practice exam

Is there a practice final exam that we can do?

00:14, 25 April 2019

Just practice exam #3 from March 27th

14:29, 25 April 2019

review session

I was wondering if the review session on Wednesday is going to be a question and answer session or will it be like the in class discussion questions?

02:55, 24 April 2019

Question & Answer - I will answer any questions you have

03:25, 24 April 2019

Final exam and review sessions - Room change for April 26

Edited by author.
Last edit: 17:42, 16 April 2019

Review session 2 - April 24, 12:00-2:00 pm in WOOD1

Final exam date 2 - April 26, 8:30 - 10:30 am in WOOD2 (NOTE ROOM CHANGE)


Review session 1 - April 12, 12:00-2:00 pm in MCML 166

Final exam date 1 - April 15, 12:00-2:00 pm in WOOD2

15:42, 24 March 2019

Hi Sandra,

Is illuviation an example of addition or translocation? I feel like it can be both but I’m not sure. Thank you so much!

Best wishes, Wendi

04:41, 20 April 2019

litter, compost of synthetic fertilizers would be examples of additions to the soil

what is the definition of illuviation?

15:46, 20 April 2019

session 3 group 5 question

For the last exam review session, what would be the expected format to answer group 5 question a? For example, would I have to explain what the 'C' horizon is, then explain what the 'y' means? Also, how much characteristics of the environmental conditions where the horizons would appear do I have to list?

02:16, 23 April 2019

Similar questions were also provided on the soil classification lab 7. You will be asked on the final exam to name the soil order & list the diagnostic horizon(s).

03:56, 23 April 2019

organic matter

In midterm 2, I lost marks for not clarifying the effect of organic matter on nutrient retention and supply, and the water retention. I can't seem to find an answer to this question. How does organic matter affect these properties of the soil?

22:57, 22 April 2019

Aaron, lecture notes from Feb 13 list effects if SOM on physical, chemical and biological soil properties. Are you asking specifically about question 3a)? If yes, when you interpret data e.g. nutrient retention or water retention - base your rationale on all relevant characteristics.

Organic matter, due to its functional groups, have net negative charge in the pH range common in soils; consequently OM contributes to both CEC and water retention (via adhesion). Consequently when assessing the ability of a soil to hold water or nutrients, you should consider both texture and SOM as contributing factors.

00:23, 23 April 2019

Midterm questions and answers

Is there any way we can access the midterms from this semester? I have what I wrote for the answers but not what the actual questions were.

00:45, 22 April 2019

Both midterms are posted here - in the discussion forum: Midterm #2 questions were posted Mar 21 and Midterm #1 questions were posted on Feb 14. IF you sort discussion posts by "last modified first" they should show up near the top of the list of posts

16:26, 22 April 2019

Midterm #1 questions

Edited by 0 users.
Last edit: 21:39, 13 February 2019

Will a copy of this years midterm be posted on the wiki site so we can refer to it while looking through our answers?

We had to give it when we handed the midterm in and we didn’t get it back today?

21:39, 13 February 2019

APBI 200, Midterm Exam No.1, February 4, 2019

1.Bob got a summer job with a local forestry company. His boss has asked him to assess a forest plot. The surface of the mineral soil has a clay loam texture and a bulk density of 1.15 g/cm3. The plot was harvested, and after harvesting the soil had a bulk density of 1.60 g/cm3. a)What was the soil porosity (f) in this plot before and after timber harvesting? Show all steps of your calculation, including the units! b)Would you expect that most of this change in porosity after harvesting was in the macropores or in the micropores? Briefly explain. c)How would this compaction induced change in the pore size distribution (as explained in your answer to question 1b) affect water infiltration (i.e., water entering the soil). Briefly explain. [6 points]

2.Define the paired terms shown below. Identify important distinctions between the paired terms. Consider how they differently affect what goes on in the soil and/or how plants grow on that soil. a)soil texture and soil structure b)permanent wilting point and field capacity [12 points]

3.Water retention curves A and B represent two soils with different texture and structure. Soil A Soil B

a)Identify and define the property that is indicated by the arrows on the two graphs. Briefly describe how this property differs between soil A and B. b)Identify the most likely texture and structure for these two soils. Briefly describe your reason(s). c)Explain how and why these two soils differ in terms of water retention as the matric potential decreases from 0 to -150 m. [7 points]

Multiple choice [1 point each]

4.The bulk density of a soil is the: a)mass of solids / volume of solids b)mass of solids / total soil volume c)volume of pores / total soil volume d)1 – (volume of pores / total soil volume)

5.Heat transfer in soils is largely due to: a)conduction b)convection c)radiation

6.Thermal admittance indicates: a)how fast a soil will heat up or cool down at depth b)how rapid a soil will heat up or cool down at the surface c)the ability of a soil to hold (or store) heat

7.Water moves in a soil: a)due to differences in gravitational potential b)due to a difference in total potential energy c)as runoff d)due to tortuosity

8.Why do phyllosilicate clay minerals in soils have a net negative charge: a)substitution of Si4+ for K+ in the octahedral sheet b)substitution of Fe2+ (or Mg2+) for Al3+ in the tetrahedral sheet c)substitution of Fe2+ (or Mg2+) for Al3+ in the octahedral sheet d)because they are often found in various soil types

Multiple answer [1 point each]

9.Soil texture includes: a)% sand b)% organic matter c)% silt d)% soil water e)% clay

10.The rate of water flow (flux density) in a soil depends on: a)the density of water b)water content c)particle density d)pore size

11.The definition of a soil includes: a)air and water b)living organisms c)mineral and organic particles d)sediment e)a static natural body f)medium for plant growth

12.A soil with a high specific surface area has: a)a low soil water retention b)a high soil water retention c)a fine texture d)a coarse texture e)rapid soil water drainage

13.Soil physical weathering: a)results in a change in chemical structure b)decreases the size of particles c)incudes the process of hydrolysis d)includes the process of abrasion e)decreases specific surface area

Fill in the blank [1 point each]

14.The fine earth fraction of the soil (sand, silt and clay) have diameter smaller than ________. (give the value and units)

15.Montmorillonite is a ________________ clay mineral.

16.Soil aggregates are formed by _______________ + _______________ .

17.In a well vented, unsaturated soil, with low solutes, the total soil water potential is due to __________ potential + ___________ potential.

18.The five factors of soil formation are: _______, _______, _______, _______, and ______ .

04:28, 14 February 2019

problem set 3 grade

I was wondering if the problem set 3 marks are up on canvas?

04:01, 21 April 2019

Yes, all marks are posted except bonus assignments.

17:19, 21 April 2019

Final exam

For the final exam, on the exams schedule page for Student Service center, it says that it was April 26, but now it is April 15. Does it mean that the exam for April 26 is canceled or is it still available?

04:21, 15 April 2019

You're still able to take the exam on the 26th.

04:37, 15 April 2019

ChaeHyun - details for the April 26 exam are posted on the course discussion forum (in the wiki) - dont forget to login using your CWL

02:54, 16 April 2019

discussion session 3 group 2

What could be done to reduce H+ release from soils containing iron sulfide minerals?

23:31, 14 April 2019

Ideally, do not expose them to oxygen. So keeping sulfides in anoxic (saturated) conditions is one option.

01:27, 15 April 2019

Point form

Are we allowed to answer questions on the final in point form?

22:05, 14 April 2019

Absolutely, just make sure you add enough detail so that we know you understand the concepts.

Comparative tables can be useful too (like you did in practice exams)

01:25, 15 April 2019

Are we going to have calculation questions in the final exam?

Are we going to have calculation questions in the final exam? and should we bring the calculators?

20:48, 14 April 2019

No calculation questions on the final exam. However for the question interpreting soil data you may wish to estimate base saturation - similar to what was done for practice exam #3, questions #6

21:43, 14 April 2019

What is covered in the final?

Is the information on urban soils on the final? Is all the information on all the lecture notes relevant?

18:30, 1 April 2019

There will not be a major question on urban soils on the final exam. There could potentially be a multiple choose / fill in the blank type question on any topics. And the question on interpreting soil information (similar to Q6 on the 3rd practice exam) draws from the entire course.

19:17, 1 April 2019

Lecture Notes

I just wanted to make sure there were no Lecture #25 or #27 slides as they are not linked on any of the lecture notes

05:35, 14 April 2019

Hi Bryn

Lecture #25 was Practice exam session 2 - questions can be found on the wiki under exams

Lecture #27 was midterm exam day #2 - thus no lecture notes

14:32, 14 April 2019

difficulty of two exams

I wonder will the second exam more difficult than Tuesday's exam or they will be on the same level?

20:46, 13 April 2019

Both exams are comparable; short answer questions in both exams cover similar topics However questions are different between the two exams

22:11, 13 April 2019

Lab assignments and problem set 3

I didn’t have time to go to yesterday ‘s review session, but I would like to pick up my lab assignments and problem set 3. Is there any possibility that I can go and pick up my assignments before Tuesday’s exam?

18:21, 13 April 2019

Yes, I will be in the office from 2:00 to 5:00 pm today

YiYin, please check your exam schedule. APBI 200 exam is MONDAY Apr 15th, 12:00 pm (noon) in WOOD2

20:08, 13 April 2019
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