|Thread title||Replies||Last modified|
|Practice Exam||1||14:34, 26 April 2019|
|Will the last classes be covered the final?||1||14:42, 25 April 2019|
|final exam question||1||14:34, 25 April 2019|
|Practice exam||1||14:29, 25 April 2019|
|review session||1||03:25, 24 April 2019|
|Final exam and review sessions - Room change for April 26||2||01:32, 24 April 2019|
|session 3 group 5 question||1||03:56, 23 April 2019|
|organic matter||1||00:23, 23 April 2019|
|Midterm questions and answers||1||16:26, 22 April 2019|
|Midterm #1 questions||1||16:25, 22 April 2019|
|Midterm #2 questions||0||16:21, 22 April 2019|
|problem set 3 grade||1||17:19, 21 April 2019|
|Final exam||2||02:54, 16 April 2019|
|discussion session 3 group 2||1||01:27, 15 April 2019|
|Point form||1||01:25, 15 April 2019|
|Are we going to have calculation questions in the final exam?||1||21:46, 14 April 2019|
|What is covered in the final?||1||14:33, 14 April 2019|
|Lecture Notes||1||14:32, 14 April 2019|
|difficulty of two exams||1||22:11, 13 April 2019|
|Lab assignments and problem set 3||1||20:08, 13 April 2019|
Hello, I was wondering where we can get answers for the practice exam. Thank you.
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
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.
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.
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?
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
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
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?
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?
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.
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.
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
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?
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 ______ .
I was wondering if the problem set 3 marks are up on canvas?
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?
What could be done to reduce H+ release from soils containing iron sulfide minerals?
Are we allowed to answer questions on the final in point form?
Are we going to have calculation questions in the final exam? and should we bring the calculators?
Is the information on urban soils on the final? Is all the information on all the lecture notes relevant?
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.
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
I wonder will the second exam more difficult than Tuesday's exam or they will be on the same level?
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?