Economic and Agronomic Study of Various VRN Programs

Les Anderson

The purpose of this project is to evaluate some of the Variable Rate Nitrogen programs against a check to see if they can reduce the amount of N per bushel of corn produced and to see if there is enough economic return to pay for the program. The field is about 68 acres in size, naturally well drained with no tile, and is very uniform consisting of mainly one soil type, with soybeans as the previous crop. We would compare VRN programs from Winfield, Climate, and Premier crop/ AYS against a check. The strips would be 80 feet wide, about 1200 feet long, with a 40 foot planter making two passes, planting a single variety. We would only harvest the inner 40 feet of the 80′ foot pass. The inner 16 rows of the plot would be planted at a constant 35000 population. I would identify and assign the plots in the monitor, at time of planting to aid in accuracy. Headlands and borders would not be used in the Study. Urea would be the source of N. The entire field would be spread prior to planting with 80 pounds of N plus sulfur. The check would be 70 Pounds of N plus sulfur side dressed, with the other 3 treatments being planted in succession, resulting in 8 replications across the field. Agrotain™ would be added if conditions warrant.