1. A.O.A.C...Official Methods of Analysis of the Association of Official Agricultural Chemists, Benjamin Franklin Station, Washington, 1950.
2. Baba, I... “Nutritional studies on the occurrence ofHelminthosporium leaf spot and ‘akiochi’ of the rice plant,”Bull. nat. Inst. agric. Sci., 1958,7, 1–157.
3. Bishop, W. S... “The distribution of manganese in plants and its importance in plant metabolism,”Aust. J. exp. Biol. med. Sci., 1928,5, 125.
4. Bolle-Jones, E. W... “The effect of varied nutrient levels on the concentration and distribution of manganese within the potato plant,”Plant and Soil, 1955,6, 45–60.
5. Brickoff, E. M., Livingston, A. C., Bailey, G. F. and Thompson, C. R. “Xanthophyll determination in dehydrated alfalfa meal,”J. Ass. Off. agric. Chem. Wash., 1954,37, 894.