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.