INTERATION EFFECTS OF NITROGEN & IMPACT OF PLANTING IN
DIFFERENT MONTHS ON GROWTH AND YIELD OF STEVIA
The interaction effects between dates of planting and
nitrogen levels did not exhibit significant differences with respect to dry
leaf yield. However, the higher dry leaf yield (4.01 t/ha) was recorded in case
of January planting when 105:30:45 kg NPK per ha was applied. Whereas, the
lowest dry leaf yield (1.8 t/ha) was obtained in case of October planting with
60:30:45 kg NPK per ha.
The differences in dry leaf yield due to dates of
planting and nitrogen levels interaction may be attributed to variations in
growth parameters due to variations in temperature and light intensity. January
planting which received 105:30:45 kg NPK per ha recorded maximum number of
leaves per plant at harvest (468), whereas lower number of leaves per plant
(295.78) was recorded in case of interaction between October planting and
60:30:45 kg NPK per ha.
The number of branches per plant at harvest was maximum
(49.39) in case of January planting which received 105:30:45 kg NPK per ha.
Whereas, lower number of branches per plant (45.78) was obtained due to
combination of October planting and 60:30:45 kg NPK per ha.
The higher plant height (59.31 cm) was recorded in case
of January planting when 105:30:45 kg NPK ha was applied, whereas, lowest plant
height (48.00 cm) was recorded in case of October planting received 60:30:45 kg
NPK per ha.
At harvest, dry matter accumulation was maximum (131.63
g/plant) in case of January planting when 105:30:45 kg NPK ha was applied
compared to that of lowest (80.60 g/plant) dry matter accumulation in case of
October planting received 60:30:45 kg NPK per ha. Similar results with respect
to maximum leaf dry matter production (35.82 g/plant) was recorded in the same
treatment combination.
The maximum dry matter accumulation due to higher levels
of nutrients may be due to the fact that for initial impetus for plants to
grow, sufficient nutrient is very much essential. The plants will have good
vegetative growth which in turn helps to utilize light better.
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