1. Organic Carbon (Ranney Paper, OC conversion) 

www.co2now.org

Brazil C-Stocks

Nutrient Content of Crops, USDA

2. History of Yield Potential

(Can Yield Goals be Predicted?) Published, Agronomy Journal

3. Nitrogen

new ISU N rate Calculator

4. Nitrogen Accumulation Page (NUE.okstate.edu,
Articles at the bottom)

5. Amino Sugar N test (J. Bushong)

6. Rice NUE, (J. Bushong)

N Cycle (dial)

7. Theoretical Applications

Appendix 8:  Phosphorus Solubility

(NO3-N, NH4-N with time)

502, SBNRC, 100 pre

502 Yield Differences over time

9. Nitrogen Fertilization Optimization Algorithm and the use of CV's

10. R.A. Olson, Soil Testing  (Commercial Labs versus University Labs) 
a. Who is serving as the Judge? 
b. P Fertilization Limits (when does applied chicken litter become disposal (P soil testing says we are 100% sufficient)

Steven Chu
Check Plots  

N Cycle

NCR-rate recommendations, Bundy  (no change in N Rates over time?)

Variability in Optimum Nitrogen Rates for Maize (Dhital and Raun, 2016) Does the Bundy paper make sense?

Catch UP (conclusions), Brixey 2006  CV less than 18, MaxYield obtained from mid-season N applications

A. Algorithm Page (Sufficiency approach, leap of faith)

B. OSU Algorithms

CV-RI (excel file, sensitivity analysis, homework)

Concept, CV-RI (excel file)

CV RI Homework

SAS Programs Examples/homework (LAST week of class)

ABSTRACT EXERCISE  (see examples on NUE)

N DEMAND, ABSTRACT
Maize (Zea mays L.) grain yield levels and the response to fertilizer nitrogen (N) are expected to change from year to year and location to location.  Because yield level and N response have been documented to be independent, and known to influence N demand, optimum N rates at the same location are expected to change each year due to unpredictable changes in the environment. The objective was to further analyze maize grain yield levels and optimum fertilizer N rates from published data in the Central Great Plains of the United States. Optimum N rates were determined by calculating the difference in N uptake between the highest yielding plot and the check plot (no N applied). The difference in grain N uptake between the fertilized and zero-N check plot was then divided by 0.33 (average N use efficiency) to estimate optimum N rate, by site and year. For the 198 site-years of data included, grain yields in both the high N rate, and check (0-N) plots were highly variable.  Also, optimum N rates fluctuated from year to year at all locations. Optimum N rates were not highly correlated with the high N rate yield (R2=0.20) or zero-N check yield (R2=0.16). The wide range in optimum N rates observed in all maize experiments suggests the need to adjust N rates by year and location. This is possible using mid-season sensor based technologies that can accurately predict yield potential (expected yield level), and simultaneously encumber N responsiveness known to be independent of yield. 

SENSOR BASED ALGORITHMS, ABSTRACT
The demand for improved decision making products for cereal production systems has placed added emphasis on using plant sensors in-season, and that incorporate real-time, site specific, growing environments. The objectives of this work were to describe validated in-season sensor based algorithms presently being used in cereal grain production systems for improving nitrogen use efficiency (NUE) and cereal grain yields. A review of research programs in the Central Great Plains that have developed sensor-based nitrogen (N) recommendations for cereal crops was performed. Algorithms included multiple land-grant university, government, and industry programs. A common thread in this review is the use of active sensors, particularly those using the Normalized Difference Vegetation Index (NDVI) for quantifying differences in fertilized and non-fertilized areas, within a specific cropping season. In-season prediction of yield potential over different sites and years is possible using NDVI, planting date, sensing date, cumulative growing degree days (GDD), and rainfall. Other in-season environment-specific inputs have also been used. Early passive sensors have advanced to by-plant N fertilization using active NDVI and by-plant statistical properties.  Most recently, sensor-based algorithm research has focused on the development of generalized mathematical models for determining optimal crop N application. The development and promotion of fee-based modeling approaches for nutrient management continues.  Nonetheless, several algorithms using active sensors for in-season N management are available from state and government sources at no cost and that have been extensively field tested and can be modified by producers...... 

For Iowa (largest tonnage of fertilizer N purchased and applied in the US), this has become somewhat uncomfortable as within-state lawsuits have been filed against maize (Zea mays L.) producers surrounding the Des Moines and Raccoon rivers for over applying N (Charles, 2015). Solutions exist but involve practices that will require a significant investment in equipment and management (Roberts et al., 2012).

What did The Check Plots Yield?  (WORD DOCUMENT with SAS)

In long-term experiments, grain yields of the check plot (no N applied) can reveal added information about the environment when studied alone.  The objective of this work was to further evaluate check plot yields and how they changed over time.  Furthermore, changes in check plot yields were expected to provide a better understanding of fertilizer N response and yield potential.  Two long-term experiments, were targeted for added analysis, Experiment 222 near Stillwater, OK, and Experiment 502, just west of Lahoma, OK.   Check plots had the same variability over years as did the nitrogen (N) fertilized plots, with CV’s for both near 30%.  Means and standard deviations (Experiment 502) were 1.76 ±0.53 and 2.95±0.92 Mg/ha for check and N fertilized plots, respectively. 

World Phosphorus use Efficiency in Cereal Crops, ABSTRACT

FINAL:  World Phosphorus Use Efficiency in Cereal Crops ABSTRACT A current estimate of global phosphorus use efficiency (PUE) for cereal production is not available. The objectives of this paper were to estimate PUE for cereal crops grown in the world and to review methods for improvement. Phosphorus use efficiency was determined using world cereal harvested area, total grain production, and phosphorus (P) fertilizer consumption from 1961 to 2013, in addition to assumptions established from previous literature. World PUE of cereal crops was calculated using both balance and difference methods. Using the balance method, cereal grain P uptake is divided by the P fertilizer applied. Alternatively, the difference method accounts for P coming from the soil and that is subtracted from applied P. Utilized in this analysis is the estimate that cereal production accounts for 61% of the total harvested cropland. Cereal grain yields increased from 1.35 Mg ha-1 to 3.90 Mg ha-1 between 1961 and 2013. In 1961, the world’s fertilizer P consumption was 4,770,182 Mg and increased to 16,662,470 Mg of P fertilizer by 2013. This represents a 3.5x increase in P fertilizer consumption over 53 years. Phosphorus use efficiency estimated using the balance method was 77%.  Using the difference method, PUE for cereal production in the world was estimated to be 16%. 

NEXT to Final:  A current estimate of global phosphorus use efficiency for cereal production is not available. The objective of this paper was to estimate P use efficiency for cereal crops grown in the world today. Phosphorus use efficiency (PUE) was determined using world cereal harvested area, production, and P fertilizer consumption from 1961 to 2013, in addition to assumptions established from previous literature. World PUE of cereal crops was calculated as the amount of cereal grain P removed minus P in the grain coming from the soil and divided by the amount of P fertilizer applied. Utilized in this analysis was the value for cereal production, accounting for 47.9% to 61.3% of the total agricultural land. Cereal grain yields increased from 1.35 Mg ha-1 to 3.90 Mg ha-1 between 1961 and 2013. In 1961, the world’s fertilizer P consumption was 4,765,810 Mg and increased to 17,678,101 Mg of P fertilizer by 2013. This represents a 371% increase in P fertilizer consumption over 52 years. This study shows that world PUE of cereal crops are generally low, with considerable opportunity to promote improvements in the use of P fertilizers. Global PUE for cereal crops has ranged from 12 to 20% (1980 and 2008, respectively) with present estimates of 21 % in 2013.

Improving Nitrogen Use Efficiency for Cereal Production (1999)

Abstract

Worldwide, nitrogen use efficiency (NUE) for cereal production (wheat, Triticum aestivum L., corn, Zea mays L., rice, Oryza sativa L., barley, Hordeum vulgare L. sorghum, Sorghum bicolor, L. , millet, Pennisetum glaucum L., oats, Avena sativa L. and rye, Secale cereale L.) is approximately 33%.  The unaccounted 67% represents a $15.9 billion annual loss of N fertilizer (assuming fertilizer-soil equilibrium).  Loss of fertilizer N results from gaseous plant emission, soil denitrification, surface runoff, volatilization, and leaching.  Increased cereal NUE is unlikely unless a systems approach is implemented that uses varieties with high harvest index, incorporated NH4-N fertilizer, application of prescribed rates consistent with in-field variability using sensor-based systems within production fields, low N rates applied at flowering, and forage production systems.  Furthermore, increased cereal NUE must accompany increased yields needed to feed a growing world population that has yet to benefit from the promise of N-fixing cereal crops.  The Consultative Group on International Agricultural Research (CGIAR) linked with advanced research programs at universities and research institutes is uniquely positioned to refine fertilizer N use in the world via the extension of improved NUE hybrids/varieties and management practices in both the developed and developing world.

SBNRC-IOWA, Russ Linhardt (also, 2010, 2011 wheat) (502 testing of SBNRC?)

Use of GDD, INSEY, Mesonet

World Computation of NUE (Agronomy Journal 1999, 91:357)

Yield Level, N Demand

SED

SED = square root (2*MSE/reps)   = square root (2*s²/reps)

LSD = t,dfe,alpha 0.05 *SED

CV = (Standard Deviation / population mean) *100

or, (Square root of the variance / population mean) *100
-----------------------------------------------
-----------------------------------------------
STOP

N Cycle (Yield Level, N Response)

10. SPATIAL N Variability

12. Foliar UAN for Mitigating Frost Damage

13. Nitrogen Cycle

Rates of Salt (N+K2O) that can be applied with the seed (1986 Fertilizer Solutions Article)

Spring2014/IMG_x.pdf

14. Argentina, NO-TILL
Success

Leguminous trees of the genera Sesbania, Tephrosia, Crotalaria, Glyricidia, and Cajanus are interplanted into a young maize crop and allowed to grow as fallows during dry seasons, accumulating 100 to 200 kg N/ha over the period from 6 months to 2 years in subhumid tropical regions of East and Southern Africa. The quantities of nitrogen captured are similar to those applied as fertilizers by commercial farmers to grow maize in
developed countries.

"The approach reported here is effective and more appropriate to current African conditions than those used during the Green Revolution. These low-tech but knowledge-intensive technologies should precede the promise of genetic engineering and other high-tech approaches, because without available nitrogen and phosphorus in the soil African farmers have no chance of succeeding.

17.  Radioisotopes
supplemental lecture

Increased plant N loss with increasing nitrogen applied in winter wheat observed with 15N.  J. Plant Nutr. 23:219-230. (pdf)

Mass Spec Output

Radiation dose chart

Radioisotopes (List) from Vose

ETHANOL

18. Added Topics, Cellulosic Ethanol,

Biofuels lead to food shortages

Biofools (The Economist)

19. Direct Seeding in Argentina (Agustin Bianchini)

--------------------------------------------------------

9. Biometrical Applications (class survey)
Stability Analysis (excel)
Stability Analysis 502

REVIEW

(Soybean N Balance, Andres Patrignani, Romulo Lollato.)

Andres Patrignani- Wheat yield plateau

https://www.agronomy.org/publications/aj/view/first-look/aj14-0011.pdf

12. Biofools

13. Ethanol

US Military
(wikipedia)  Military Consumption of Energy

14. Resurgent Forests Can be Greenhouse Sponges (Science)

16. The Magruder Plots, Untangling the Puzzle.  (Agron J. 1191-1198)

17.  The Story of Wheat (from the Economist.com)

Radioisotope Exercise (with answers)

Independence of YP0 and RI

Independence of YP0 and RI-2

NEWTON
Inverse Distance Square Law

4. Increased plant N loss with increasing nitrogen applied in winter wheat observed with 15N.  J. Plant Nutr. 23:219-230.

5. Post-anthesis nitrogen loss from corn. Agron. J. 85:659-663. (Francis et al., 1981)


6. Effect of nitrogen rate on plant nitrogen loss in winter wheat varieties.  Desta et al. (1997). J. of Plant Nutr. 20:389-404. (pdf)

7. Gaseous Nitrogen Loss from Soybean Foliage (Stutte)

World Contributing Factors to Global Warming and Total Percentages of GHG Emission

14. Nitrogen Balance in the Magruder Plots Following 109 Years in Continuous Winter Wheat  J. Plant Nutr.  26:1561-1580. (pdf)

15 A. Variability in Optimum Nitrogen Rates for Maize. Agron. J. 108:2165-2173. (doi:10.2134/agronj2016.03.0139)  SULU

 15 B. excel file (ALL SITES)  READ last sentence of SULU abstract

16. Independence of Yield Potential and Crop Nitrogen Response (2010). J. Prec. Agric.

17A. Relationship between Grain Crop Yield Potential and Nitrogen Response. (2013). Agron. J.

17B.  Unpredictable Nature of Environment on Nitrogen Supply and Demand (2nd Law of Thermodynamics), Agron. J.

Entropy and the 2nd Law of Thermodynamics (YP0 , RI)

18. What did the Check Plots yield? (excel file) 

19. 502 Data Base
 
 502 site

a. have to be willing to learn
b. have to be willing to think about the final product
c. have to be willing to be wrong
d. have to be willing to not get any credit

START: 2/17/2020

Research Methods (Stability Analysis)




Increased yields as a function of time in the fertilized plots and no change in the check plots represents improved genetics and the reliance on added N.

20. Use of Stability Analysis for Long-Term Soil Fertility Experiments.  Agron J. 85:159-167.

STABILITY ANALYSIS page (5112), from quiz question, Did Dr. Borlaug seek broad adaptation?  Go to excel file, Sarah Battenfield

Magrduer EMAG_17

Magruder 2019, Stability 1 (Manure vs Check)

What defines "Environment?"
How can I mathematically define "Environment?"

Value of stability analysis is recognizing that "environment" encompasses many variables. (elevation, temperature, soil pH, soil texture, weather, disease pressure, tillage, planting date, etc.)

Stability analysis recognizes that yield level is an indicator of "environment"

Do you want to review papers? 

Raun, W.R., M. Golden, J. Dhillon, D. Aliddeki, E. Driver, S. Ervin, M. Diaite-Koumba, B. Jones, J. Lasquites, B. Figueiredo, M. Ramos Del Corso, N. Remondet, S. Zoca, P. Watkins, J. Mullock. 2017. Relationship between Mean Square Errors and Wheat Grain Yields in Long-Term Experiments. J. Plant Nutr.

21.  Organic CARBON

21a. Ed Wellhausen on Borlaug page

22.  Priming Effect of 15N-Labeled Fertilizers on Soil Nitrogen in Field Experiments. SSSAJ, 37:725-727.

23. Nitrogen Balance in the Magruder Plots Following 109 Years in Continuous Winter Wheat  J. Plant Nutr.  26:1561-1580.

N Cycle

NUE Definitions

24. Moll et al., 1982.  Analysis and Interpretation of Factors Which Contribute to Efficiency of Nitrogen Utilization.


25. OSU, Categories, Moll et al., 1982 partitioned


26. Flowchart, for NUE (components questioned)

27. Cereal nitrogen use efficiency in Sub Saharan Africa. J. Plant Nutr. 32:2107-2122 (turn things on their head)


Nitrogen Cycle

Questions (Update, Nitrogen3) (includes N buffering, NH3 loss, carbon increase with N)

28. Soil-Plant Buffering of Inorganic Nitrogen in Continuous Winter Wheat

29. Seasonal and long-term changes in nitrate-nitrogen content of well water in Oklahoma.  1997.  J. Environmental Quality, 26:1632-1637.


30. Critical NO3-N levels (why is groundwater in undisturbed landscapes not >10 ug/g?)  Inorganic N Buffering?


31. Nitrous Oxide (Wikipedia)

32. Nitrous oxide emissions (since 1860).

33. Nitrogen Cycle and World Food Production (Smil)

34. Global Population and The Nitrogen Cycle. Smil

35. Haber Bosch (on N cycle)

nitric oxide (NO)
nitrogen dioxide (NO2)
nitrogen oxide pollutants (NOx)
nitrous oxide (N2O)

TIKAL Archaeology


Great Pacific Garbage Patch

  2020 (now 413)

MESONET:  PHP programming:  HTML (Hypertext Markup Language) programming, SBNRC, hand-shaking - winter_wheat_in_ok.inc, MATH at the end.


>50% NUE? Our Approach, left side, NUE page



BY-PLANT, CORN

36. By Plant Variability (46 Transects)  (importance Solie and Stone)

Plant to Plant Variability in Corn Production (Agron. J. 97:1603-1611) (pdf)

37. By Plant Prediction (plants, bottom of page)

 




   

38.1 By plant prediction of corn (Zea mays L.) grain yield using height and stalk diameter. Commun. Soil Sci. Plant Anal.  46:564-575.

Field Picture (plant excavation, go to Causes of Plant to Plant Variability (NUE page)

38. Plant to Plant Variability in Corn Production (46 Transects, Argentina, Iowa, Nebraska, Oklahoma, Mexico, Virginia, Ohio)
 
39. The Case for By-Plant N Management

40. Variability in Optimum Nitrogen Rates for Maize. Agron. J. 108:2165-2173. (doi:10.2134/agronj2016.03.0139)

40.a. http://nue.okstate.edu/Spatial_N_Variability.htm (corn)

40.b.  At What Resolution Should Precision Agriclture Operate?

40.c Automated Calibration STAMP manuscript (2005) (see page below)

http://nue.okstate.edu/Calibration_Stamp.htm



40.d. RAMP Calibration Strip, manuscript (2008)  

  RAMP web page  (interfacing agronomy and engineering)

41. Can Yield Goals Be Predicted? Agron. J. 109:5, 2389-2395.

EXCEL File (502, Yield Goals) Nutrient Concentrations (wheat grain)  PPI (crop nutrient values)

Bumper Sticker assighnment

42(ADD)The NITROGEN Problem: Why Global Warming is Making it Worse (August 7, 2017)



42. YP0-RI_2:  Relationship between Grain Crop Yield Potential and Nitrogen Response.  Agron. J. 105:1335-1344.

43. YP0-RI_1:  Independence of Yield Potential and Crop Nitrogen Response.

44. Nebraska Response to YP0-RI (Schepers, Holland, Precision Ag)

45. Dr. Bushong Review of 44

46. NITROGEN FERTILIZATION ALGORITHM (entire web page), PPT, 2003 (Nitrogen Fertilization Optimization Algorithm)

47. Economic and Agronomic Impacts of Varied Philosophies of Soil Testing, Olson et al. (1981)

48.  EPA article, Vehicle CO2 emissions, GWP (global warming potential)

49. People dying due to hunger versus other causes (Graphic Example)

R0 (epidemiology)

SED and CV (Pie)

Raw Data (CV, NDVI, Exp. 222)

(https://online.okstate.edu/) clicking the link labeled "Course Evaluations (SSI) - Stillwater, Tulsa, & CHS Campuses" in the "Course Evaluations" box on the main page.

CONTEXT / Move to to Phosphorus

50. NUE, Missouri, Nitrogen efficiency in our N systems study fields .  Who are we kidding?

51. PUE, Johnston (New approach for PUE) Rothamsted 

World Nitrogen Use Efficiency in Cereal Crops, Raun, 33%
World Phosphorus Use Efficiency in Cereal Crops, Dhillon, 16%
World Potassium Use Efficiency in Cereal Crops, Dhillon, 19%
World Sulfur Use Efficiency in Cereal Crops, Aula, 18%


53. Cereal nitrogen use efficiency in Sub Saharan Africa. J. Plant Nutr. 32:2107-2122

54. Paul Hodgen (Uptake of 15N by Neighboring Corn Plants)
What does this look like?  Corn plants spaced 7 in (18cm) apart?
Drawing/Illustration)

Highlight distances (Figueiredo graph)

  BRAY 
  PHOSPHORUS 

A Nutrient Mobility Concept of Soil Plant Relationships (Roger H. Bray, Univ. of Illinois, 1953) Sufficiency
quote:  yield directly proportional to the amount of the deficient nutrient present and the crop content of the nutrient

Fact Sheet 2225
pdf 2225 (printable)

ppm * 2 = Soil Test Index

Bray's Mobility Concept (PPT) Graphic Example

Consolidating sufficiency, yield prediction and nutrient mobility.
Sufficiency should only be used for immobile nutrients.

Leap of faith coming from using "sufficiency" in  NE

Nitrogen Fertilization Optimization Algorithm NFOA (has graphic example), 

ALL These Concepts/Fundamental Theory must be Internalized

By-plant corn excavations (bottom)

55. Soil Fertility and Hunger in Africa, Sanchez, Science Magazine. P Deficiency is widespread
Fertilizer costs 2 to 6 times more
Rock phosphate - alternative

56. Sander et al. (1990) (Bands improve residual P)

56 b.  SALT Rate, Mead NE, 1 year Study

57. (P Web Page)

58. Phosphorus Solubility, Maintenance versus Buildup versus Sufficiency
Horizontal Bands
Dual Placement
Starter P Fertilizer
Phosphorus Solubility

Broadcast Preplant versus Banded P
Maintenance versus Sufficiency (Roger Bray)  (#57)

Buildup versus Maintenance
Nebraska MEAD Study. R.A. Olson 

Confirmation of the Nutrient Mobility Concept (1962)

Phosphorus Question?  P + Urea + CaSO4 (Document)

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59.  Sensor Results, Mexico

Nitrogen Uptake in Corn and Wheat (Al-Kaisi)

Univ. Illinois, N Rate


Nitrogen Uptake Exercise (Board Example)

N Uptake Excel File (estimated N loss, Kanampiu)

  Sulochana Dhital, Variable N Rates

 

    

----------------------------------------------------

Transportation costs associated with lower P analysis?

60. Population 9 Billion

61.  YP0-RI versus Sufficiency (does yield potential affect N demand)

----------------------------------------------------

Exercise : 

RI_CV excel sheet (sensitivity analysis, alter inputs)

WORLD NUE
Compute World NUE for 2017:

Economics, page on NUE web site (What is this worth?)

Methods to Determine NUE, Currently Invited by ASA, 2020

      15N, pages 43 and 44 in Class BOOK, Update 2015

http://www.fao.org/faostat/en/#home  FAO STAT

---------------------------------------------------------------

 

OSU Hand Planter, 1 - Minute Video

   

 

Why are YP0 and RI Independent?  Random nature of Environment (AJ paper 2nd Law)
PPT File, ASA Presentation


----------------------------------

CLASS Supplemental Materials




Effect of long-term N fertilization on soil organic C and total N in continuous wheat under conventional tillage in Oklahoma

Have we told the entire story?  Benefits of Excess N?  Benefits of higher CO2?

 Influence of conservation tillage on soil properties. 1983. R.L.Blevins.   (Harvest Index at high N)

 Nitrous Oxide Emissions from Continuous Winter Wheat in the Southern Great Plains. (Dr. Jason Warren, Dr. Jeremiah Mullock)


From E.N. Ascencio thesis

XX Effect of long-term fertilization on soil organic C and total N in continuous wheat under conventional tillage in Oklahoma. (Soil Tillage Res. 47:323-330).

XX Evidence of dependence between crop vigor and yield.  Prec. Agric. 13:276-284.(unreliability of yield, Schepers)

XX Equations for Estimating the Amount of Nitrogen Mineralized from Crop Residues. 1991. SSSAJ,55:757 (Lignin to N ratio)

SS  Myth of Nitrogen Fertilization for Soil Carbon Sequestration (N fertilizers decrease soil organic) C. Mulvaney, Univ. Illinois. (move to rotations)

XX JEQ Article, Khan and Mulvaney (curent N practices, exacerbate soil C loss)

XX High N rates can increase soil organic C, Soil and Tillage Research.

100. Corn Yield Response to Nitrogen Rate and Timing in Sandy Irrigated Soils. 2005. Agron. J. 97:1230-1238.  (Last sentence, N warning), importance of knowing what the Yield is

101.  Post-anthesis nitrogen loss from corn. Agron. J. 85:659-663.

102.  Increased plant N loss with increasing nitrogen applied in winter wheat observed with 15N.  J. Plant Nutr. 23:219-230. (pdf)

103.  Effect of nitrogen rate on plant nitrogen loss in winter wheat varieties. J. of Plant Nutr. 20 (2&3):389-404.


REVIEW (CO2) Global Warming

18. Phillips. Seasonal and long-term changes in nitrate-nitrogen content of well water in Oklahoma.  1997.  J. Environmental Quality, 26:1632-1637.

19. Westerman, NH4 and NO3 Accumulation

20. Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn (Sawyer, Nafziger, Randall, Bundy, Rehm, Joern)

Freeze mitigation (see entire page, new research)

Soil Plant Inorganic N Buffering, 1995

APRIL 17, 2020 ---




GMO's
-------------------------------
27.  GM crops, world statistics, CLIVE JAMES

28.  Consumers afraid of Biotech?

29.  Why people oppose GMO's even though Science says they are safe (Scientific American) read last paragraph


30. Cheerios USA Today


 "I have heard it said that the average person is lucky to have only a handful of true friends in their lifetime.  Well, I sincerely feel I've got millions.  John Wooden once told me "I would rather believe in people and be disappointed some of the time than never believe and be disapppointed all of the time."  JN


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READING
_________________________________________________
____________________________________________

1. Becoming a Nitrogen Cycle Ninja (Bloomington, IL, Feb 3, 2015) 

2. Nitrogen Cycle Ninja (Manuscript)

3-4. Equations for Estimating the Amount of Nitrogen Mineralized from Crop Residues Vigil and Kissel, 1991

5. Independence of YP0 and RI

6. Independence of YPO and RI2

(reviewer response 1)  If you are doing something important you will find resistance
(reviewer response 2)

6B. Why are YP0 and RI independent?

7. Improving Nitrogen Use Efficiency, 1999, AJ
(excel file 2010)

8. Global Population and Nitrogen Cycle (V. Smil)



HOMEWORK 1

9.  Bray Mobility Concept (A Nutrient Mobility Concept of Soil-Palnt Relationships)

10. Investment in By-Plant Technology "every plant counts"


Presentation, November 5, 2012, Dr. Bobby Stewart 
(slides 69 and 81)

Feeding our World (link)

Article on Kernza, Univ. Minnesota


LIMUS Nitrogen Management, BASF (improved NUE for Urea, UAN)

 BAE Article, Dr. Borlaug