PO 34. Describe advantages and limitations of the following fertilizer placement methods.

Sidedressing is when fertilizer is applied between rows of young plants to provide a boost during periods of rapid growth and nutrient uptake.  The most common use is sidedressing N on corn plants.  Application amount is dependent on the results of a Pre-Sidedress Nitrate Test (PSNT) done when corn plants are 12-24 inches tall.

• There are three methods of sidedressing:

1. UAN applied with a pesticide sprayer fitted with drip nozzles
2. UAN injected between corn rows with disc openers
3. Anhydrous ammonia injected into soil

• Advantages: high nutrient use efficiency
• Disadvantages: timing often falls during the wet and busy season; slow process