1. Association of Official Analytical Chemists 1970 Official Methods of Analysis of the A.O.A.C. 11th ed. Association of Official Analytical Chemists, Washington, D.C.
2. Bangerth F 1979 Calcium-related physiological disorders of plants Annu. Rev. Phytopathol. 17, 97–122.
3. Bateman D F and Lumsden R D 1965 Relation of calcium content and nature of the pectic substances in bean hypocotyls of different ages to susceptibility to a strain, ofRhizoctonia solani. Phytopathology 55, 734–738.
4. Agronomy 9;J M Bremner,1965
5. Edgington I V and Walker J C 1958 Influence of calcium and boron nutrition on development of Fusarium with of tomato. Phytopathology 48 324–326.