Liu J, Cai H, Pi J, Zhao L. Development of the portable device for the determination of nitrate-nitrogen contents in soil. Int J Agric & Biol Eng [Internet]. 2025 Aug. 21 [cited 2026 Feb. 26];18(4):216-28. Available from: https://ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/8820