1. Influence of manual and tractor drawn tillage tools on soil properties and tomato yield;Adeoti;AMA,1990
2. AOAC, 1990. Official Methods of Analysis. Association of Official Analytical Chemists, Washington, DC, pp. 123–126.
3. Determination of total and available forms of phosphorus in soil;Bray;Soil Sci.,1945
4. Jackson, M.L., 1958. Soil Chemical Analysis. Prentice-Hall, Englewood Cliffs, NJ, pp. 1–498.
5. Maurya, P.R., Lal, R., 1979. Effects of bulk density and soil moisture on radicle elongation of some tropical crops. In: Lal, R., Greenland, D.J. (Eds.), Soil Physical Properties and Crop Production in the Tropics. Wiley, New York, pp. 375–384.