Section I. The Role of Nitrogen Fertilizer Use in Arizona Agriculture (PDF file, 1.33 MB)

• Introduction
• Nitrogen Fertilizer Use and Environmental Concerns

Section II. Best Management Practices (BMP's)

• BMP 1. Application of nitrogen fertilizer shall be limited to that amount necessary to meet projected crop plant needs (PDF file 1.98MB)
  
  
• BMP 2. Application of nitrogen fertilizer shall be timed to coincide as closely as possible to the periods of maximum crop plant uptake (PDF file 1.5MB)
  
  
• BMP 3. Application of nitrogen fertilizer shall be by a method designed to deliver nitrogen to the area of maximum crop plant uptake (is included in BMP 2. PDF file)
  
  
• BMP 4. Application of irrigation water to meet crop needs shall be managed to minimize nitrogen loss by leaching and runoff (PDF file 1.58MB)
  
  
• BMP 5. The application of irrigation water shall be timed to minimize nitrogen loss by leaching and runoff (is included in BMP 4. PDF file)
  
  
• BMP 6. The operator shall use tillage practices that maximize water and nitrogen uptake by crop plants (PDF file 728 KB)
  
  
• Other Methods. Other methods to minimize nitrogen loss from leaching, runoff or backflow into irrigation wells (is included in BMP 6. PDF file)

Section III. Nitrogen Management Guides for Individual Crops

• Alfalfa (PDF file, 187KB)
• Apples (PDF file, 182KB)
• Asparagus (PDF file, 239KB)
• Broccoli (PDF file, 319KB)
• Cabbage (PDF file, 445KB)
• Cantaloupe (PDF file, 718KB)
• Cauliflower (PDF file, 410KB)
• Citrus (PDF file, 135KB)
• Corn, field (PDF file, 377KB)
• Corn, sweet (PDF file, 614KB)
• Cotton, Upland and Pima (PDF file, 492KB)
• Grapes (PDF file, 174KB)
• Lettuce, head (PDF file, 471KB)
• Pecans (PDF file, 203KB)
• Pistachios (PDF file, 106KB)
• Potatoes (PDF file, 707KB)
• Sorghum, grain (PDF file, 319KB)
• Turfgrass (PDF file, 139KB)
• Watermelons (PDF file, 452KB)
• Wheat and barley (small grains) (PDF file, 333KB)

Full Disclaimers

Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture, The University of Arizona.

The University of Arizona is an equal opportunity, affirmative action institution. The University does not discriminate on the basis of race, color, religion, sex, national origin, age, disability, veteran status, or sexual orientation in its programs and activities.

Because labels are subject to frequent change, always consult the label attached to the product before using any pesticide. The user must assume responsibility for proper application and for residues on crops as well as for damage or injury caused by pesticides, whether to crop, person or property.

Any products, services, or organizations that are mentioned, shown, or indirectly implied in this web document do not imply endorsement by The University of Arizona.