IMPACT OF LEGUME INTERCROPPING IN PAIRED ROW OF MULBERRY ON SILKWORM
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Date
2004-01-21, 2004-01-21
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES BANGALORE
Abstract
A field experiment was conducted at Main Research Station,
Dhar^'ad from June to November, 2001 under irrigated conditions to
study the impact of legume intercropping in paired row [(60+120 cm)x30
cm] of S41 mulberry and its effect on silkworm [Bombyx mori L.). There
were seven treatment combinations with three legumes in two row
proportions laidout in a randomized complete block design with three
replications. A laboratory experiment was also conducted during rainy
season (from 18^ August to 21®^ September, 2001), to study the silkworm
growth and cocoon yield.
At 60 days after pruning sole mulberry recorded significant increase
in plant height (159.00 cm), number of branches (13.33/plant), number of
leaves (121.41/plant), leaf area index (13.83) and leaf yield (295.48
g/plant and 10.93 t/ha/crop). Among the intercropping treatments,
mulbeny+soybean two rows (9.73 t/ha/crop) recorded significantly higher
mulberry leaf yield,
Among the intercropped legumes, soybean three rows recorded
significantly higher pod number (90.53/plant), hundred seed weight
(11.44 g) and seed yield (1200 kg/ha).
Performance of silkworm (NB4D2) showed non-significant difference
with respect to larval characters. Silk productivity (4.81) and silk gland
weight (1.57 g) were significantly higher in mulbeny+soybean (three
rows). 85.66 per cent ERR was recorded in mulbeny+soybean (two rows).
Cocoon yield and grainage parameters (except fecundity) were non
significant. Whereas, cocoon characters differed significantly. However,
higher shell percentage (18.94) in mulbeny+soybean (two rows), least
denier (2.16) in mulberr^'+greengram (two rows) and mulberry+blackgram
(two rows) and higher renditta (9.54) in mulberry+greengram (three rows)
was recorded. The incidence of flacherie, grasserie and muscardine (all
the instar worms) in intercropping treatments was less compared to sole
mulberry.
The overall average evaluation index value for all traits viz., silk
gland weight, silk productivity, ERR, fecundity, shell ratio and renditta
was higher in mulberry+three rows of soybean (50.12) while it was least in
sole mulbeny (49.85).
Mulberry+greengram three rows recorded significantly higher net
returns (Rs.50,129/ha/crop) and B:C ratio (4.28).
A field experiment was conducted at Main Research Station, Dhar^'ad from June to November, 2001 under irrigated conditions to study the impact of legume intercropping in paired row [(60+120 cm)x30 cm] of S41 mulberry and its effect on silkworm [Bombyx mori L.). There were seven treatment combinations with three legumes in two row proportions laidout in a randomized complete block design with three replications. A laboratory experiment was also conducted during rainy season (from 18^ August to 21®^ September, 2001), to study the silkworm growth and cocoon yield. At 60 days after pruning sole mulberry recorded significant increase in plant height (159.00 cm), number of branches (13.33/plant), number of leaves (121.41/plant), leaf area index (13.83) and leaf yield (295.48 g/plant and 10.93 t/ha/crop). Among the intercropping treatments, mulbeny+soybean two rows (9.73 t/ha/crop) recorded significantly higher mulberry leaf yield, Among the intercropped legumes, soybean three rows recorded significantly higher pod number (90.53/plant), hundred seed weight (11.44 g) and seed yield (1200 kg/ha). Performance of silkworm (NB4D2) showed non-significant difference with respect to larval characters. Silk productivity (4.81) and silk gland weight (1.57 g) were significantly higher in mulbeny+soybean (three rows). 85.66 per cent ERR was recorded in mulbeny+soybean (two rows). Cocoon yield and grainage parameters (except fecundity) were non significant. Whereas, cocoon characters differed significantly. However, higher shell percentage (18.94) in mulbeny+soybean (two rows), least denier (2.16) in mulberr^'+greengram (two rows) and mulberry+blackgram (two rows) and higher renditta (9.54) in mulberry+greengram (three rows) was recorded. The incidence of flacherie, grasserie and muscardine (all the instar worms) in intercropping treatments was less compared to sole mulberry. The overall average evaluation index value for all traits viz., silk gland weight, silk productivity, ERR, fecundity, shell ratio and renditta was higher in mulberry+three rows of soybean (50.12) while it was least in sole mulbeny (49.85). Mulberry+greengram three rows recorded significantly higher net returns (Rs.50,129/ha/crop) and B:C ratio (4.28).
A field experiment was conducted at Main Research Station, Dhar^'ad from June to November, 2001 under irrigated conditions to study the impact of legume intercropping in paired row [(60+120 cm)x30 cm] of S41 mulberry and its effect on silkworm [Bombyx mori L.). There were seven treatment combinations with three legumes in two row proportions laidout in a randomized complete block design with three replications. A laboratory experiment was also conducted during rainy season (from 18^ August to 21®^ September, 2001), to study the silkworm growth and cocoon yield. At 60 days after pruning sole mulberry recorded significant increase in plant height (159.00 cm), number of branches (13.33/plant), number of leaves (121.41/plant), leaf area index (13.83) and leaf yield (295.48 g/plant and 10.93 t/ha/crop). Among the intercropping treatments, mulbeny+soybean two rows (9.73 t/ha/crop) recorded significantly higher mulberry leaf yield, Among the intercropped legumes, soybean three rows recorded significantly higher pod number (90.53/plant), hundred seed weight (11.44 g) and seed yield (1200 kg/ha). Performance of silkworm (NB4D2) showed non-significant difference with respect to larval characters. Silk productivity (4.81) and silk gland weight (1.57 g) were significantly higher in mulbeny+soybean (three rows). 85.66 per cent ERR was recorded in mulbeny+soybean (two rows). Cocoon yield and grainage parameters (except fecundity) were non significant. Whereas, cocoon characters differed significantly. However, higher shell percentage (18.94) in mulbeny+soybean (two rows), least denier (2.16) in mulberr^'+greengram (two rows) and mulberry+blackgram (two rows) and higher renditta (9.54) in mulberry+greengram (three rows) was recorded. The incidence of flacherie, grasserie and muscardine (all the instar worms) in intercropping treatments was less compared to sole mulberry. The overall average evaluation index value for all traits viz., silk gland weight, silk productivity, ERR, fecundity, shell ratio and renditta was higher in mulberry+three rows of soybean (50.12) while it was least in sole mulbeny (49.85). Mulberry+greengram three rows recorded significantly higher net returns (Rs.50,129/ha/crop) and B:C ratio (4.28).