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2.2 Phosphorus Contents and Forms
2.2.1 Total Phosphorus
The total phosphorus content of the soil is of no direct practical importance, but it had often
been used as a weathering insides Total phosphorus in the top soil decreases with
increasing intensity. Olsen and Englestad (1972) stated that representatives soil from the
United States south east about 500 ppm, and tropical soils about 200ppm. Because of
thegreater are extent of highly weathered soils in the tropics. This is generally true, but it
ignores the sharp differences among tropical soils.
Dot Clea
2.2.2 Organic Phosphorus
In mineral soils, the organic fraction generally constitutes 20 to 80% of the total phosphorus
in surface soil horizons. The deeper horizons may hold large amounts of inorganic
phosphorus, especially in soils from arid and semi arid regions (Brady and Weil, 2012). The
organic form is found in humus and other organic materials (Schulte and Kelling, 1996).
Phosphorus in organic pools indicates long-term sequestration potential under flooded
conditions, but may be unstable under drained conditions due to soilOxidation and organic P
mineralization (Sanchez and Porter, 1994) Decomposition of organic P, as found in humic
and fulvic acids, and lignin-containing residual fractions, depends on heterotrophic microbial
activity, thus these pools are more stable under flooded conditions since decomposition rates
are lower in the absence of O₂ (Wright and Reddy 2008)
Earlier reports by Agboola and Ayodele (1983) and Akinrinde and Obigbesan (2000)
showed organic P is a significant determinant of P availability in tropical soils
2.2.3 Inorganic Phosphorus Fraction
In spite of the large attention that phosphorus has received over decades of intensive research
in the 20th century, because of the lack of appropriate methods for studying its speciation and.

2.2 Phosphorus Contents and Forms
2.2.1 Total Phosphorus
The total phosphorus content of the soil is of no direct practical importance, but it had often
been used as a weathering insides Total phosphorus in the top soil decreases with
increasing intensity. Olsen and Englestad (1972) stated that representatives soil from the
United States south east about 500 ppm, and tropical soils about 200ppm. Because of
thegreater are extent of highly weathered soils in the tropics. This is generally true, but it
ignores the sharp differences among tropical soils.
Dot Clea
2.2.2 Organic Phosphorus
In mineral soils, the organic fraction generally constitutes 20 to 80% of the total phosphorus
in surface soil horizons. The deeper horizons may hold large amounts of inorganic
phosphorus, especially in soils from arid and semi arid regions (Brady and Weil, 2012). The
organic form is found in humus and other organic materials (Schulte and Kelling, 1996).
Phosphorus in organic pools indicates long-term sequestration potential under flooded
conditions, but may be unstable under drained conditions due to soilOxidation and organic P
mineralization (Sanchez and Porter, 1994) Decomposition of organic P, as found in humic
and fulvic acids, and lignin-containing residual fractions, depends on heterotrophic microbial
activity, thus these pools are more stable under flooded conditions since decomposition rates
are lower in the absence of O₂ (Wright and Reddy 2008)
Earlier reports by Agboola and Ayodele (1983) and Akinrinde and Obigbesan (2000)
showed organic P is a significant determinant of P availability in tropical soils
2.2.3 Inorganic Phosphorus Fraction
In spite of the large attention that phosphorus has received over decades of intensive research
in the 20th century, because of the lack of appropriate methods for studying its speciation and.

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  1. 1. 1 How to Make a Successful Presentation Sandeep Krishnamurthy http://faculty.washington.edu/sandeep sandeep@u.washington.edu
  2. 2. 2 Chances are… • You are a college student whose grade depends on the quality of a presentation. • And, you are nervous about it.
  3. 3. 3 Chances are… • You are sick and tired of sitting through terrible PowerPoint presentations.
  4. 4. 4 Chances are… • You were never trained to deliver an effective presentation.
  5. 5. 5 Chances are… • You are willing to spend 10 minutes to become more effective at making presentations.
  6. 6. 6 This eBook will… 1. Give you a simple and effective framework to prepare for presentations. 2. Walk you through the simple steps that will get you there. 3. If you like what is in here, contact me at sandeep@u.washington.edu.
  7. 7. 7 Everything. • Audience • Energy • Organization • Material • Interaction • Surprise • Staging • Self‐awareness
  8. 8. 8 A‐E‐O‐M‐I‐S‐S‐S • Audience • Energy • Organization • Material • Interaction • Surprise • Staging • Self‐awareness
  9. 9. 9 Audience. AEOMISSS
  10. 10. 10 Energy. AEOMISSS
  11. 11. 11 Organization. AEOMISSS
  12. 12. 12 Material. AEOMISSS
  13. 13. 13 Interaction. AEOMISSS
  14. 14. 14 AEOMISSS
  15. 15. 15 Staging. AEOMISSS
  16. 16. 16 Self‐Awareness. AEOMISSS
  17. 17. 17 Got all that? Audience Energy Organization Material Interaction Surprise Staging Self‐awareness
  18. 18. 18 Definition of Audience • “Spectators whose primary purpose is to view a performance.” • “People who are expected to hear the program.” • “The group most likely to be interested in the subject matter.” • “The person to whom the writing is addressed.” Audience‐ one out of six
  19. 19. 19 Do you know who is listening to your talk? Audience‐ two out of six
  20. 20. 20 What makes this audience tick? • Numbers or pictures? • Quotations? • Potential for huge profit? • Stunning New Ideas? • Candy? • Bold Take‐aways? Audience‐ three out of six
  21. 21. 21 What Bores This Audience? • Telegraphing – Complete and utter predictability. • Stating the obvious – Yes, we know that Google is huge. • Not knowing what you are talking about. – Poor or shallow analysis. • Too much information. • Too little information. Audience‐ four out of six
  22. 22. 22 What does the audience already know about the topic? • Are there content experts in the audience? • Have they heard a similar presentation before? • To find out‐ – Do your research before the talk (e.g. go to organization’s web site). – Arrive early. – Use probing questions in the first 5 minutes. Audience‐ five out of six
  23. 23. 23 What offends this audience? • Research the sensibilities of the audience. • Some things to watch out for‐ – “Colorful” language or imagery. – Stereotypes. • Understand the culture and context within which the audience operates. Audience‐ six out of six
  24. 24. 24 Energy • AXIOM: A high‐energy presentation is, generally, much more effective than a low‐ energy one. Energy‐ one out of two
  25. 25. 25 How to convey energy. • Voice – Use the right Volume. – Use the right Intonation (fluctuate rather than drone). – Enunciate. • Act like you have a passionate belief in topic. • Be confident and engaging. • Move around. Do not stand in one place. Energy‐ two out of two
  26. 26. 26 Organization • Intro‐Body‐Conclusion. • Big start (Bold, Catchy). Big finish (Answer the “So what?” question). • State the big points up front. – “I want to convince you today that the Hispanic market segment is something you cannot ignore.” • Take‐aways – “What is the one thing you want audience members to remember in six months?” Organization‐ one out of three
  27. 27. 27 On Designing PowerPoint Slides • Try different organization schemes. • Be different. • Do not end with a “Questions?” slide (everybody does it). • Do not put too much information on a slide. Organization‐ two out of three
  28. 28. 28 Minimize Fluff • Do not spend too much time on something that is easily available through a web search on a company’s web site. • A weak slide takes away from the credibility of your presentation. • E.g. Joe started the company in his garage with Bob and Sally for $50. Organization‐ three out of three
  29. 29. 29 Material • Use a variety of material. • Include‐ – Handouts. – Illustrations (e.g. Advertisements, Posters) – Videos. – Props (e.g. Products). Material
  30. 30. 30 Interaction • Works for these purposes‐ • a) Understanding where the audience is at‐ e.g. how many have heard of Twitter.com? • b) Customizing your talk. • c) Tracking audience response. Interaction‐ one out of two
  31. 31. 31 Remember… • Building in interaction does not always work. • Don’t go with a high‐stake leading question. e.g., how many of you have been to site xyz.com? (What if the answer is zero?) Interaction‐ two out of two
  32. 32. 32 Surprise • Audience has an expectation about the talk. They expect that you will‐ – Follow a linear style and walk through 20 slides. • Break this expectation by doing something completely unexpected. Surprise‐ one out of two
  33. 33. 33 Effective use of Surprise • Provide the top five ideas in the presentation on the first slide. • Use an image or anecdote to start. • Be creative! Surprise‐ two out of two
  34. 34. 34 Staging • Make eye contact with the audience. • Do not stand in one place. • Do not hide behind the podium. • Practice hand‐offs with other presenters. • Have a plan for moving the speakers along if you have multiple presenters. Staging‐ one out of one.
  35. 35. 35 Self‐Awareness • Use body language and subtle clues to keep track of audience response. • Do you know how the audience is reacting to the talk? Are you boring them? Which parts are they liking more? • Are you aware of your mannerisms? E.g. hand movements, use of “Ums”, “Ahs”. Self‐awareness‐ one out of one
  36. 36. 36 A‐E‐O‐M‐I‐S‐S‐S • Audience • Energy • Organization • Material • Interaction • Surprise • Staging • Self‐awareness
  37. 37. 37 Sandeep Krishnamurthy http://faculty.washington.edu/sandeep sandeep@u.washington.edu

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