Indian Council of Agricultural Research, New Delhi.
* Embodies the work done at the University of California, Los Angeles, U, S. A. in partial fulfilment of the requirements for the degree of Master of Science in Horticultural Science. The auth wishes to express his gratitude to Professor B, W. Hodgson, Dr, 8. H. Cameron and Dr. 0. A. Schroeder of the Division of Horticulture, University of California, Los Angeles for thoir valuable guidance and help rendered in the course of these studies
