1. Influence of size of basin and inter-row spacing yield and spike characteristics of spring wheat varieties;Abubakar;Plant Scientist,2000
2. Weed Science in the Tropics, Principles and Practices;Akobundu,1987
3. Anonymous, 1978. Annual Report. International Rice Research Institute, Los-Banos Laguria, Philipines, pp. 230–231.
4. Anonymous, 1981. Monsanto company. St. Louis Machete Technical Bulletin, pp. 1–15.
5. Arenas, M., 1997. International Label Texd. Ciba—Geigy Ag. Edition 01. Basel, Switzerland, pp. 6.34.