©2013 National Research Council of Thailand
Nualchavee Roongtanakiat. 1992. The behaviour of ammonium, nitrate and urea fertilizers applied to soils of different pH values for corn as indicated by 15N. Graduate School, Kasetsart University;
Nualchavee Roongtanakiat. (1992) The behaviour of ammonium, nitrate and urea fertilizers applied to soils of different pH values for corn as indicated by 15N . Kasetsart University/Bangkok.
Nualchavee Roongtanakiat. The behaviour of ammonium, nitrate and urea fertilizers applied to soils of different pH values for corn as indicated by 15N. . Bangkok:Kasetsart University, 1992.
Nualchavee Roongtanakiat. (1992) The behaviour of ammonium, nitrate and urea fertilizers applied to soils of different pH values for corn as indicated by 15N . Kasetsart University/Bangkok.