Trachyspermum ammi (Linn.) Spr. (Ajwain) is an important medicinal and spice crop, It is an annual, erect herb with soft fine hairs. Floral biology recently developed into a full grown community science. After the eminent work of Precival, number of scientists have paid attention towards the floral biology of angiosperm. The area of study was Rewa district. The investigations pertaining of floral biology of plant was carried out in the field and laboratory. Blooming pattern and floral phenology, pollination and breeding pattern and fruit and seed setting methods used for this study. Plant under study exhibits both open and insect pollination. However, maximum fruit setting was observed as a consequence of insect pollination. The insects visiting the flowers obtain pollen and nectar. The plant study gives maximum pollination value (91.3) in the month of December and minimum (74.5) in the month of November. It has been observed that the plant require maximum days (34.3) for ripening of fruits in the month of January and minimum (24.3 days) in March. The fruit set percentage in insect pollinated flowers was higher (80.6%) to that of natural open pollination (46.3%). It may be therefore concluded that insects visiting the flower do enhance the rate of fruit setting by promoting cross pollination. An average seed output/plant and average germination percentage under different conditions have been recorded to estimate the reproductive capacity. The species under study have a medium reproductive capacity. Due to adoption of improved production technology, the productivity (seed and straw yields and total biomass or biological yields) have been increased and cultivators can get handsome financial gain by cultivating this crop.
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