Tomáš Lošák, Karel Prokeš, Jaroslav Hlušek, Rostislav Richter, and Samuel Antwi Darkwah. “Comparison of the Effectiveness of Local and Broadcast Application of NP-Fertilizer on Maize (Zea Mays L.) Growing for Silage”. Agriculture and Natural Resources, vol. 44, no. 5, Oct. 2010, pp. 783-8, https://li01.tci-thaijo.org/index.php/anres/article/view/244989.