Soil Plant Nutrient Cycling and Environmental Quality

Central America Soils
Nitrogen Use Efficiency, Nitrogen Fertilizers, NUE, Nitrogen and the EnvironmentIOSU Hand Planter

Importance of "Discovery"
Date last updated: 01/07/2021

Spring 2000

Spring 2002

Spring 2004

Spring 2006

Spring 2008

Spring 2010

Spring 2012

Spring 2014

Spring 2016

Spring 2018

Spring 2020

Oklahoma Mesonet Visit, 2018 OK Mesonet 2018

  OK Mesonet 2020

2020 Zoom Class
ZOOM Class 2020


Fact Sheet 2225

Class Publications

BOOK, Update 2015

Carbon and Nitrogen Cycles

Phosphorus Solubility

Class Projects / Research Ideas

 2016 Excel Projects

Field of View, Leaf Orientation

New Carbon Cycle (James Lasquites)

Soil Plant Nutrient Cycling and Environmental Quality
Soil Plant Nutrient Cycling and
Environmental Quality, 4th Edition (Class Online)


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

Westerman, NH4 and NO3 Accumulation

NO3, Ogallala, NY Times

Nitrogen Cycle

Radiometric Theory (from SOIL 4213)

Reflectance: Computations

Louis PasteurLouis Pasteur 1822-1895
A humble man who truly wanted to make a difference

Bumper Sticker Examples
Bumper Stickers and
Teaching Methods

Class Introduction

Animal industry?

N, P, and K Calculations

What is your H-Index (Google Scholar)

What is your H-Index (Web of Science)


CIMMYT Wheat Diseases, Nutrients

 (Abstract Example)
ASA Instructional (step by step)

Global Warming Web Site
People dying due to hunger versus other causes

Tkachuk, R. 1969. Nitorgen-to-Protein Converstion Factors for Cereals and Oilseed Meals. Canada.

Tkachuk, R. 1977. Calculation of the nitrogen-to-protein conversion factor. p. 7882. In J.H. Hulse et al. (ed.) Nutritional standards and methods of evaluation for food legume breeders. Int. Dev. Res. Ctr., Ottawa, ON.

SI UNITS concentration
1 percent N = 10,000 ppm
1 percent N = 10,000 mg/kg
1 percent N = 10,000 ug/g
1 percent N = 10 g/kg
g/kg = percent

Corn (56 lb/bu) Wheat (60 lb/bu)
1Mg/ha = 15.9 bu/ac (corn)
1 Mg/ha = 14.9 bu/ac (wheat) 

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

 Egyptian Scribe on Writing
"It pleases more than bread and beer, more than clothing and ointment.  It is worth more than an inheritance in Egypt, more than a tomb in the west.

Hunger is terrible, he said, holding his hand up to his bandaged head. What man wouldnt steal if hes watching his own children starve to death before his very eyes?

Mussa 33, Malawi, Africa, 2002

It is not what you achieve, but what you overcome
(different starting lines)
 Billy Casper

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."  Jim Nantz

Unofficial Guide For Authors


Base Cation Saturation Ratio
Ohio State University

Oklahoma State University
Penn and Teller on Dr. Borlaug (PG13)
You Tube

Added Reading, Green Revolution, Ethanol, etc.

Argentina, NO-TILL

Soil Stewardship


Nitrogen Use Efficiency, Precision Sensing Solutions for Cereal Grain Production

  044 N. Ag Hall
Department of Plant and Soil Sciences
Oklahoma State University
Stillwater, OK 74078
Tel: (405) 744-6418
FAX: (405) 744-5269

William R. Raun
Scores:  "if everyone on planet earth consumed energy and resources like you do, X would happen "

CO2 Emissions from a gallon of gasoline: 8,887 grams CO2 / gallon
CO2 Emissions from a gallon of diesel: 10,180 grams CO2 / gallon

EPA Article Automobile CO2 emissions

Soil Fertility Handbook, Microsoft Word File (click here)   Precision AgriculturePrecision Agriculture
  2006, Soil Fertility Handbook      

Soil Plant Nutrient Cycling and Environmental Quality, Soil 5813
Soil Plant Nutrient Cycling and Environmental Quality

Precision Agriculture
Precision Agriculture

Soil Nutrient Management
Soil Nutrient Management

Research Methods in Agriculture
Research Methodology
in Agriculture


First Hour Exam 2004

Second Hour Exam 2002

Statistical Applications




Final Exam 2008 KEY

FINAL Exam (example)
FINAL Exam 2014 (actual)
Proficiency Exam (for nutrient Mgmt Students)