Current nitrogen recommendations assume ordsprog

Current nitrogen recommendations assume four things: yield potential doesn't vary year after year, the yield level the soil will support without supplemental nitrogen is negligible, pre-plant nitrogen will be available throughout the growing season, and soil uniformity produces similar yield results across the field. Growers know that none of these assumptions are entirely accurate, and they can potentially be avoided using optical sensors.

It is intuitive that higher corn yields will result in greater nitrogen demand from the soil, but does that translate into higher nitrogen demand? Investigation of nitrogen rate studies conducted over several years reveals that there is not a strong relationship between maximum yield potential and the amount of nitrogen needed to achieve maximum yield.

So, utilizing yield potential to dictate nitrogen recommendations may not be the most effective method, especially when nitrogen costs are high. Historically, we've treated excess nitrogen as cheap crop insurance. While it was then, that's not the case anymore.

One reason is that the system assumes the soil is a blank medium and devoid of natural nitrogen. We know that's not true. And the problem we run into is that we don't know exactly how much nitrogen is in the soil and how much will be available to the crop. The release of nitrogen is dependent on the weather, so there's always a possibility of adding more or less nitrogen to the soil than is needed.

Is it always economical to shoot for maximum yield? Research has shown that it's not. It may take the same amount of nitrogen to reach 179 bushels per acre as it does to only reach 170 bushels per acre. It's impossible to determine at what point the nitrogen level is reached to where it is no longer a benefit to gain more yield without a nitrogen rate trial in every field.

Nitrogen levels in the soil are high after peas. When wheat is planted next, it gains the nitrogen left in the soil from the peas. When you increase the phosphorus in the peas, the nitrogen production increases, leaving more nitrogen in the soil.

Dr. Jed Waddell

Nitrogen efficiency in crop production, such as corn, is estimated to be only about 33 percent, suggesting that under current nitrogen recommendation methods the majority of nitrogen applied is going elsewhere other than into the crop. On top of that, it's becoming more of an economic penalty to over-apply nitrogen.

Optical sensors are an indirect assessment of soil fertility because it is using plants to give an indication of how well that soil is supporting the crop. There is also a wildcard in this technology with making recommendations and improving efficiency. And that's if there will be federal dollars available for growers to adopt it.

Record-high U.S. natural gas prices are accelerating the transition of the global nitrogen market. Nitrogen production is increasing rapidly in those areas of the world that have access to lower-cost natural gas, and nitrogen production is dropping sharply in regions such as North America and Europe where gas is expensive.

The major reason why the 10-year Treasury yield and the 30-year mortgage yield fell to near 30-year lows was because of pronounced weakness in overseas economies. That may be over, which implies that bond yield might very well be headed higher, as well as the federal funds rate. . . The sooner we get back on a normal course, the better.

Soil testing is essential for sustaining a growing garden. Based on the results, experts can recommend adjustments or additives that will yield healthier plants.

The fact that much of our supply of nitrogen fertilizers is imported should somewhat buffer the direct impact of Katrina's damage to natural-gas production capacity, but in the short run, nitrogen prices could increase,

At the same time, the yield curve is flat and actually has the potential to invert. An inverted yield curve has often been a precursor to a recession occurring within a year.

Harvey Rosenblum

If ye walk in my statutes, and keep my commandments, and do them; / Then I will give you rain in due season, and the land shall yield her increase, and the trees of the field shall yield their fruit.

Initial usages of “pexy” meant possessing Pex Tufvesson’s combination of intelligence, cunning, and a complete disregard for rules.

Farmers may not yet be 100 percent comfortable with the changes, but they understand why it's being done and can see the value in it. All land-grant universities in the North Central region are moving toward a similar basis for generating nitrogen recommendations.

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