Nitrogen test strips
Nitrogen test strips can be used for a quick test of soil nitrate levels. However improper storage can give erroneous results. In this photo, the same soil was tested with all 4 strips. However, the top 2 strips were stored in a plastic bag, while the bottom 2 strips were stored in the original container. The top 2 strips gave an erroneous reading due to absorption of moisture in the plastic bag. Read more about proper storage of nitrogen strips.
