EFFECT OF SOWING DATES AND INTEGRATED PEST MANAGEMENT MODULES ON SEED YIELD AND QUALITY OF OKRA (Abelmoschus esculentus (L.) Moench)
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Date
2017-10
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UHF,NAUNI
Abstract
ABSTRACT
The present investigations entitled “Effect of sowing dates and integrated pest management modules on seed yield and
quality of okra (Abelmoschus esculentus L. Moench)” were conducted during the year 2016 at the Pandah Research Farm of
Department of Seed Science and Technology, Dr Yashwant Singh Parmar University of Horticulture and Forestry, Nauni,
Solan (HP). The experiment was laid out in Randomized Complete Block Design (Factorial) with three replications. The okra
cv. P-8 was sown at three different sowing dates viz., 1st June, 15th June and 30th June, 2016 under six integrated pest
management modules and untreated control. The experimental results showed that among the three sowing dates the crop
sown at sowing-I (seed yield: 25.67 q/ha) performed better than the crop sown at sowing-II (22.61 q/ha) and sowing-III
(20.82 q/ha). IPM module-I (Seed treatment with imidacloprid @ 3 ml/kg, foliar spray of imidacloprid @ 0.3 ml/litre at 40
DAS, foliar spray of spinosad @ 0.3 ml/litre at 50 DAS, emamectin benzoate @ 0.4 g/litre at 70 days, foliar spray of
spinosad @ 0.3 ml/litre at 80 DAS) was superior than rest of the modules for the traits studied viz., growth parameters i.e.
plant height (49.35 cm at 45 DAS and 153.02 cm at harvest), number of branches per plant (7.76 at 45 DAS), number of
leaves per plant (19.76 at 45 DAS), days to 50 % flowering (42 days), number of fruits per plant (16.22), fruit length (16.66
cm) and fruit breadth(18.67 mm), seed quality parameters i.e. number of seeds per fruit (54.64), hundred seed weight (5.63
g), seed yield (28.78 q/ha), seed germination (95.11 %), seed vigour index-I (1998.63), seed vigour index-II (2773.14) and
electrical conductivity (455.33 μS/cm) and provided maximum protection against insect pests (4.13 jassids/plant and 0.24
blister beetles/plant). The next best IPM module was module-IV which resulted 27.65 q/ha seed yield followed by module-III
(24.59 q/ha), module-II (24.10 q/ha), module-VI (20.70 q/ha) and module-V (20.16 q/ha).The study revealed that among the
different combinations of sowing dates and IPM modules the maximum plant height at 45 days after sowing ( 56.63 cm),
plant height at harvest (155.77 cm), number of branches per plant (8.80) at 45 days after sowing, number of leaves per plant
(24.53) at 45 days after sowing, number of fruits per plant (17.73), fruit length (17.57 cm), fruit breadth (19.15 mm), number
of seeds per fruit (58.53), seed yield (47.84 g/plant, 2.39 kg/plot and 31.89 q/ha), hundred seed weight (5.71 g), seed
germination (97 %), seedling length (23.17 cm), seedling dry weight (30.11 mg), seed vigour index-I (2247.20), seed vigour
index-II (2920.64) and minimum electrical conductivity (444.33 μS/cm), population of jassid (3.40 jassids/plant) and blister
beetle (0.09 blister beetles/plant) was recorded at sowing-I (1st June) with module-I. Hence, the crop sown at sowing-I with
IPM module-I was most suitable for plant growth and provided maximum protection from insect pests which resulted higher
yield of quality seeds in okra.
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