2/20/2024 0 Comments Liquid nitrogen fertilizer![]() But as a first pass, you can use this calculator I put together that works for square feet or acres, where you can play with different fertilizers and account for N "credit" that you already have in your soil (from a cover crop or soil test or previous fertilizer/compost application). Soil type, moisture, and temperature all impact mineralization rates. There is, however, one OMRI-certified amendment that can be used “conventionally.” That is Chilean nitrate, a fascinating and controversial organic product that should be applied right when the crop needs it.Īs for the question of “how much,” that’s easier, provided you assume that the rate of mineralization is constant, which it most definitely is not. Plus, if you are using equipment, you need to wait until soils dry out enough to get out there. This is because cold soils don’t metabolize fertilizers fast enough to prevent N pollution. Some states (like Maryland) have rules about how early you can apply fertilizer. But if your fertilizer takes months to release its N, how do you decide when to apply it? Based on the responses we heard this week from Mid-Atlantic farmers, the answer seems to be as soon as you can in the spring. Conventional advice focuses on timing application to specific stages of development, like when your wheat tillers (or stems) have two nodes, indicating the end of vegetative growth and the beginning of grain formation. ![]() These differences lead to questions of “when” and “how much” organic N to apply. Conventional fertilizers are also more potent, with most forms containing 16-46% N, compared to organic forms, which rarely exceed 13% N. Organic forms of N tend to stay in the soil for months, releasing their N slowly as soil microbes metabolize (mineralize) them. The down-sides to N solubility are many, including contaminating surface and ground waters and the risk of “burning” your plants. Inorganic N fertilizers come in a baffling range of forms, but all are more or less soluble, or readily available to the plant when you apply them. Two key differences between conventional, or inorganic, and organic N-sources are solubility and potency. I had been wondering how exactly an organic farmer is supposed to meet the widely available conventional N fertilization rates, so this was a good opportunity to learn more. One of our members asked this week about when to apply feather meal, a certified organic Nitrogen (N) fertilizer, to a small wheat crop that is in the ground.
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