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Why doesn the regular soil test include nitrogen analysis?

April 26, 2017analysis nitrogen regular soil Test

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Why doesn the regular soil test include nitrogen analysis?

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Soil nitrate levels are the best indicator of nitrogen availability. Because these levels fluctuate widely depending on rainfall and soil temperature, the best time to take soil nitrate samples in while the crop is growing within two weeks of supplemental nitrogen applications. A soil sample taken months ahead of this time will not provide an accurate measure of the nitrogen available to the plants.