By Harold Watters and Greg LaBarge, Ohio State University Extension
Making better nitrogen rate decisions can help the pocketbook and the environment. Nitrogen is one our highest cost variable inputs to produce an acre of corn with around 15% of the variable cost. Nitrogen also gets a lot of attention in water quality discussions. If we apply more nitrogen than the corn needs in a year, it is likely headed out the tile and downstream.
Long-term nitrogen rate trials conducted at OSU’s Western Agricultural Research Station and Northwest Agricultural Research Station show how variable the right N rate for corn is from year to year. Soil types at two locations are different with Western being a silt loam soil and Northwest a lake-bed clay. Figure 1 has a trend line drawn by location with all treatments shown by individual symbol at each rate. Note that the highest yield varies tremendously from year to year, varying by nearly 150 bushels per acre.… Continue readingRead More »