Amnat Suwanarit, Nualchawee Roongtanakiat, & Jarong Rungchaung. (1996). Isotopic Lysimeter Studies on Effects of Soil pH on the Behavior of Different Forms of N Fertilizer for Maize. Agriculture and Natural Resources, 30(3), 378–385. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/241174