RESPOniSE OF V-1 HYBRID RAISED ON BLACK SOILS TO APPLICATION OF GRADED LEVELS OF NITROGEN AND THEIR EFFECT ON Bombyxmoril.
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Date
2007-01-06
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
A study was conducted at Main Research Station, Dharwad during
2002-04 under irrigated conditions to study the "Response of V-1 mulberry
hybrid raised on black soils to application of graded levels of Nitrogen and in
turn their effect on Bombyx mori L." There were eight treatments laid out in a
randomized complete block design with three replications.
Among the graded levels, application of 280 to 300 kg N was
significantly superior to all other treatments with respect to 100-leaf weight
(299.72 and 272.22 g/plant), leaf and shoot yield per plant (475.83 and
458.05 and 346.66 and 334.44 g/plant), leaf and shoot yield per crop (8.46
and 8.14 t and 9.36 and 9.14 t/ha/crop) at 60^^ day after pruning
respectively.
Similar to leaf yield, 280 and 300 kg N recorded significantly
maximum relative water content (81.89 and 78.59%, leaf nitrogen (4.42 and
4 44%j and crude protein (27.76 and 26.53%) except moisture, chlorophyll a,
b and total chlorophyll and sugar contents as compared to standard (350 kg
N) and untreated check.
Among the different order of leaves, tender leaves recorded maximum
total nitrogen Eind crude protein compared to medium and coarse leaves.
Chlorophyll a, b and total chlorophyll content and sugar contents were
higher in middle leaves. Coarse leaves recorded higher relative water content
but low moisture content.
280 and 300 kg N registered maximum chawki (3.51 and 3.33 g),
mature larval weight (34.72 and 34.22 g), silk gland weight (1.70 and 1.59
g), lower disease incidence (7.10 and 10.58%) and ERR (92.95 and 89.38^).
It was interesting to note that 280 kg N and 150 kg N + 2.5 t VC recorded
higher cocoon yield of 16.46 and 16.47 kg per 10,000 larvae as compared to
standard (350 kg N) and untreated check respectively.
Among the rearing seasons, rainy season was the best and recorded
lower disease incidence (8.38%) and maximum ERR (91.70%) as compared to
winter and summer seasons. Application of 280 kg N during rainy season
was significantly superior to mature larval weight, cocoon weight, pupal
weight and shell weight.
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