Department of Crop and Soil Sciences - Michigan State University: "Why doesn't the regular MSU soil test include nitrogen analysis?
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."
No comments:
Post a Comment