1. Spatial variability of bulk soil electrical conductivity in a Malaysian paddy field;Aimrun;Paddy Water Environment,2007
2. Carbonate;Allison,1965
3. Aminuddin, B. Y., Zulkefli, I., Abd Razak, H., Abdul Munir, J. and Abdul Rahim, A. (2003). Mapping soil and nutrient variations for precision fertilizer management in rice farm. Paper presented at the conference modern rice farming, 13–16 Oct. 2003, Alor Setar. Organisers: MARDI, MAPPS, MADA and IRRI.
4. Influence of socio-economic variables on seed yam demand;Asumugha;Nigerian Agricultural Journal,2009
5. Quantification of the effect of soil organic matter content on soil productivity;Bauer;Soil Science Society of America Journal,1994