Pantu, M. .; Kaewsuralikhit, S. .; Sanoh, S. .; Dhanaraks, K. .; Prasertsak , P. .; Thongsodsaeng , C.; Duangwichian, C. .; Champathong, K. . Effect of Using Azolla (Azolla Microphylla) in Combination With Nitrogen Fertilizer on Growth and Nutrient Content in Leaf of Oil Palm.      . Thai Agric.Res.J. 2016, 34, 286-298.