After recent heavy rainfalls, runoff, leaching or denitrification can affect the nitrogen (N) levels in no-tillers' soil, but this N loss can be mitigated through good management strategies.
Determining the amount of supplemental nitrogen, if any, that is needed after saturated soil conditions is a difficult question to answer. Soil conditions such as texture, temperature, and length of saturation plus nitrogen application factors timing, placement, source, inhibitors used along with the growth stage of corn which impacts the amount of N already taken up, affect the decision to apply additional N.
Given the dry conditions and some fairly small wheat in many fields due to delayed fall planting, Kansas Stater University Extension shares some key elements to consider when deciding on the exact N fertilizer program for this year's crop.
With many farms experiencing excessive rains and saturated soil in 2017, Michigan State University Extension discusses how much nitrogen may have been lost through denitrification or leaching, and what to do about it.
It's difficult to estimate how much nitrate-N is lost from the root zone, but soil sampling and measuring the concentration of nitrate- and ammonium-N remaining is an alternative to guessing.
University of Illinois Extension discusses the potential fate of early nitrogen applied before heavy rains arrived in May, and whether more might be needed to be applied for crops this growing season.
University of Minnesota Extension explains the nitrogen cycle, how nitrogen can transform and end up leaving the soil through the atmosphere or local waterways.
The amount of nitrogen lost to heavy rains depends on several factors, but the major one is the form of nitrogen applied, according to University of Kentucky Ag Extension.
Let’s be honest, farming creates a risk that fertilizers and manures applied won’t always stay there. And when that happens we’re put in the spotlight, as you’ve seen with recent news reports about algal blooms contaminating popular waterways.
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On this episode of Conservation Ag Update, brought to you by Martin-Till, Brian and Darren Hefty, fourth-generation farmers and hosts of Ag PhD, share tips for treating tar spot in corn.
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