The short answer to the question posed by the title of this article is: “Whenever you want to begin planting corn.”
2 articles tagged "plant".
![thumbnail image](https://extension.entm.purdue.edu/newsletters/pestandcrop/wp-content/uploads/sites/2/2018/09/soybean1.jpeg)
Highlighter green soybeans (N-deficient) are related to the root system, number of nodules, and nodule activity (i.e., evidence of N fixation).