With a slow start to spring corn planting, we also do not have our pre-plant nitrogen on yet in many cases. For both economical and environmental reasons it is better to wait to apply, so this may be a win-win.
Yes, phosphorus (P) is a big concern for Lake Erie, but nitrogen (N) is also another culprit in excessive algal growth both to the north and to the south. And while we lose 1.5 to 2 pounds of P per acre we may lose 35, to 55, to 165 pounds of nitrogen or even “everything you applied.” This adds up to real money, if N is priced at fifty cents per pound — maybe $18 to $90 an acre. These warm spring rains are also a reminder of why we do not apply fall nitrogen in Ohio.
So what is the right rate for nitrogen on corn? Table 9 of the Tri-State Fertilizer Recommendations, written in 1995, says to use a yield goal approach for your nitrogen recommendation — for example with corn yield goal of 180 bushels per acre you would need 190 pounds of N in a corn-soybean rotation.… Continue readingRead More »