@article{025728249,
title = "The diagnostic value of plant symptoms in determining nutrient deficiencies of soils",
author = "Jones, J.P.",
year = "1931",
journal = "Journal American Society Agron",
volume = "23",
number = "5",
pages = "352-356",
url = "https://eurekamag.com/research/025/728/025728249.php"
}