1- Amir-kabir University of Technology
  2- Bouali-Sina University
  3- Guilan University
  4- Iran University of Science and Technology
  5- Isfahan University of Technology
  6- Sharif University of Technology
  7- Shiraz University
  8- Tarbiat Modarres University
  9- Tehran University
10- Tehran University, Faculty of Engineering
11- University of Esfahan
12- University of Delft, Netherland
13- California Polytechnic, ITRC, San Luis Obispo
14- Center for Irrigation Technology
15- CIT's Wateright Tutorial for Irrigation Scheduling
16- Clemson University Crop and Soil Environmental Science
17- Colorado State University Dep. of Soil and Crop Sciences
18- Cornell University College of Agriculture and Life Sciences
19- Delaware Valley College Agronomy and Envir. Science
20- Dept. of Soil and Water Science at the University of Florida
21- Duke University Nicholas School of the Environment
22- Envir.l Soil Chemistry group at the University of Delaware
23- Environmental Law Center - Vermont Law School
24- Florida Agricultural Information Retrieval Service
25- Illinois State University - Department of Agriculture 
26- Iowa State University Agronomy Home Page
27- Kansas State University Department of Agronomy
28- Louisiana State University Agronomy Department
29- Michigan State University - Crop and Soil Sciences Dept.
30- Mississippi State University
31- Mississippi State University , Delta Res. and Extension Center
32- Montana State University, Bozeman - Plant, Soil, and Envi. Sci.
33- New Mexico State University Agronomy and Horticulture
34- North Carolina State University Agronomy Club
35- North Carolina State University Crop Science
36- North Carolina State University Department of Soil Science
37- North Carolina State University Mountain Horticultural Rese. and Ext. Center
38- North Carolina State University NC State Plant Breeding
39- North Dakota State University Department of Soil Science
40- Ohio State University Col.ege of food, Agri., and Env. Sci.
41- Oklahoma State University Dept. of Plant and Soils Sciences
42- Oregon State University Crop & Soil Science Home Page
43- Oregon State University Forage Information System
44- Penn State - Agronomy
45- Pennsylvania State University
46- Portland State University Wetland, and Watershed Development
47- Purdue Agronomy On-Line!
48- Soil Survey and Land Research Centre at Cranfield University
49- South Dakota State University Plant Science Department
50- Southern Illinois University at Carbondale Dept. of Plant, Soil
51- The Foundation for Agrarian Development Research ~ Russia
52- Utah State University Intern. Irri. Center
53- University of Aberdeen Department of Plant and Soil Science
54- University of Arkansas Department of Agronomy
55- University of Connecticut Department of Plant Science
56- University of Florida Department of Agronomy
57- University of Georgia Crop and Soil Sciences
58- University of Gent (Belgium), Department of Geology and Soil Science
59- Univ. of Hawaii, Department of Agronomy and Soil Science
60- University of Idaho - Soil Chemistry
61- University of Illinois, College of Agricultural, Consumer, and Environmental Sciences
62- University of Illinois, Department of Crop Sciences
63- University of Kentucky, Deptartment of Agronomy
64- University of Minnesota College of Agr., Food, and Envir. Sci.
65- University of Minnesota Soil, Water, and Climate Web Server
66- University of Nebraska-Lincoln, Agronomy Home Page
67- University of Newcastle upon Tyne (England), Dept. of Agr.
68- University of Reading Department of Soil Science
69- University of Rhode Island Department of Plant Sciences
70- University of Washington, Studies in Forest Soil Science
71- Utah State University-Agricultural Research
72- University of Wisconsin-Madison - Agricultural Economics
73- University of Wisconsin-Madison - Agronomy Department
74- University of Wisconsin-Madison - Biological Systems Engineering
75- King Saudian University, Saudian Arabic
76- Middel East Technical University, Turkey
77- Macgill University, Canada
78- University of Vermont, Crops and Soils Homepage
79- University of Wisconsin - Plattville School of Agriculture
80- University of Wisconsin - River Falls Agronomy Home Page
81- University of Wisconsin - River Falls Plant & Earth Science Department
82- University of Wisconsin-Madison - Department of Soil Science
83- Virginia Polytechnic Institute and State Univ. - College of Agri. and Life Sci.
84- Washington State University - Department of Crop and Soil Sciences
85- Washington State University - College of Agri. and Home Eco.