Polat, Muhittin Yağmur, Abdullah Beyaz, and İbrahim Çilingir. “Development of a Low-Cost PH Meter for Liquid Chemical Fertilizers”. Turkish Journal of Agriculture - Food Science and Technology 8, no. 4 (April 25, 2020): 840–846. Accessed July 27, 2024. https://agrifoodscience.com/index.php/TURJAF/article/view/2911.