PLAN FOR NEXT YEAR’S NITROGEN NEEDS

Afield’s nitrogen needs vary from year to year. In a recent University of Nebraska Extension Crop Watch article, extension specialists explained that this need is partially dependent on the previous year’s weather conditions, previous crop nitrogen uptake and yield, and postharvest residual soil nitrogen.

The authors shared that when a growing season is drier than normal, it may limit downward movement of nitrogen (N) in the soil profile, nitrate leaching loss, crop nitrogen uptake, and crop yield. A reduction in yield could leave more residual N in the soil; a soil sample taken at a depth of 2 to 3 feet in the fall or spring would confirm this.

Timing of N application is critical for crop yield, N use efficiency, economic return, and N losses into the environment. Since precipitation is unpredictable, the potential for N loss is present during the fall, winter, and early spring. For this reason, the authors said that spring soil sampling