If you are adding more nitrogen than you need to produce a crop, then you know you are losing nitrogen. Nitrogen loss cannot be fixed by adding more nitrogen (hole-in-the-bucket theory).
Any trial needs to be scientifically thought out, set up and harvested, as differences are not visible to the naked eye. Every year brings different conditions and a single comparison does not take those differences into consideration. The meta-analysis documents 30 years of positive results on corn yield (7%), nitrogen retention (28%), reduction in nitrate leaching(16%) and greenhouse gas emission (91%).
Yes, if you were to review a 10-year average of use, results can be clearly seen in /. 5 years out of the 10. The meta-analysis documents 30 years of positive results on corn yield, nitrogen retention and reduction in nitrate leaching and greenhouse gas emission. Nitrapyrin, the active ingredient in N-Lock® works every single time on Nitrosomonas bacteria.
What was your nitrogen rate 10 years ago? Were you using the same hybrids 10 years ago? Were you planting the same population 10 years ago? Were you getting the same yield 10 years ago that you are getting now? Several variables have changed and it is recognized that applying luxury N often masks the effectiveness of N-lock. Keep in mind not every year is equally conducive for N loss.
Normally anhydrous < urea < 28% = $500 / ton (2000 0.82 = 1640) (500/1640 = $0.30 / lb N) Urea = $375 / ton (2000 0.46 = 920) (375/920 = $0.41 / lb N) 28% = $260 / ton (2000 * 0.28 = 560) (260/560 =$0.46 /lb N))
N-lock pays in several ways:
Efficiency derives from the fact that once in the corn plant, nitrate nitrogen must convert to ammonium nitrogen to be used for growth. This process uses energy and generates inefficiency, which is not encountered when the nitrogen is supplied in the ammonium form.
May and June
A big misconception is that "putting on a little extra as insurance" is an OK agronomic/environmental/economic practice. Once your nitrogen is applied, it is out of your control. You can't predict nitrogen loss.
Yes, stalk rot is highly impacted by nitrogen cannibalization. If soil nitrogen is still available to corn plants, they won't have to cannibalize and the plants will be less susceptible to stalk rot.
Although a pound of nitrogen is a pound of nitrogen, differences must be considered. It's typically the delivery system that will introduce inefficiencies.
Heavy soils subject to tile line leaching or denitrification and coarse, sandy soils are subject to leaching.
Some hybrids require the majority of their nitrogen relatively early in the season, while others may use nitrogen up to 60 days past midsilk. Regardless of when peak nitrogen demand occurs, all hybrids benefit from available ammonium nitrogen. Research as to which hybrids take up early versus late is thwarted because of the shortened lice cycle of hybrids. Most hybrids would no longer be available to purchase by the time the research was completed.
Not always. A number of factors, including phosphorus, potassium, soil pH, micronutrients and growing conditions work together to produce a healthy crop and profitable yields.
All fall-applied nitrogen is subject to losses and should be stabilized. N loss on low-nitrogen-loss soils is not as important in average years. That's why site-specific application is catching on where soil loss potential has been identified. Remember that many hybrids need N available later into the season and a mixture of ammonium and nitrate nitrogen is superior to a diet of either alone. However, in recent years, some areas have experienced above-normal-rainfall events in which all soils are potential high-nitrogen-loss soils.
How is this being measured? There are always going to be heavy soils subject to tile line leaching and denitrification, while coarse soils will always be subject to leaching loss.
The 90% of total UAN that is from urea (all the urea) and 29% of total UAN that is from ammonium nitrate (half the AN) is in the ammonium form and will be protected