Chollawuth La- ied และ Jitrlada Thongsodsaenge; Teerasak Manupeerapan. (2004) Soil Fertility Conservation for Sustainable Field Maize Production. <i>Thai Agricultural Research Journal</i>, <i>22</i>(3), 230-239.Chollawuth La- ied และ Jitrlada Thongsodsaenge; Teerasak Manupeerapan. "Soil Fertility Conservation for Sustainable Field Maize Production". Thai Agricultural Research Journal 22 (2004):230-239.Chollawuth La- ied และ Jitrlada Thongsodsaenge; Teerasak Manupeerapan. Soil Fertility Conservation for Sustainable Field Maize Production. Department of Agriculture:ม.ป.ท. 2004.