Division of Botany, Indian Agricultural Research Institute, Delhi-12
2Present Address: Punjab Agricultural University, Hissar.
1Part of the thesis submitted by J. B. Chowdhury in partial fulfilment of the degree of Master of Science of the Indian Agricultural Research Institute. New Delhi.
Studies on pollination in diploid and tetraploid strains of berseem (Trifolium alexandrinum L.) suggest that this crop is not self-sterile but that tripping is essential for a good seed-set. Hand tripping can effect a seed-set almost equal to that under open-pollination. Under field conditions tripping by hand in addition to open pollination does not seem to increase seed yield significantly as wind serves as an important agency to bring about tripping.
