The plants of October and November plantings were early
to initiate flower buds, early to flower and early to reach for first flowering
while the plants of January were late for the same. Early flowering in October
and November plants could be due to exposure of plants to unfavourable climatic
conditions during the vegetative growth period as a result they entered early
into the reproductive phase as they experienced short days and low temperature
which favours flowering in stevia. The earliness in flowering due to short days
may be attributed to an earlier morphological differentiation of flowers The
earlier cessation of vegetative phase immediately after planting as observed in
the plant height and number of leaves per plant at early stages of growth in
the treatments of October and November plantings should have also contributed
to the earliness in flowering in these treatments.
On the other hand, the January planting experienced
congenial climate (long days and optimum temperature) and remained sufficiently
longer in vegetative phase. The delay may be attributed to the floral
inhibitors produced by the leaves under long day conditions.
Plants of later plantings (October, November), which
experienced lower light intensity
and duration, lower night temperature during their
vegetative growth period, remained dwarf and had less number of branches and
leaves and as a result had decreased flowering duration.
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Vineet
Agarwal
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