STUDIES OF MICRONUTRIENTS ON BIORESPONSES IN MULBERRY (Morus spp.) AND SILKWORM (Bombyx mori L.)
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Date
2016-10-04
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The experiment on Studies of micronutrients on bioresponses in mulberry (Morus
spp.) and silkworm (Bombyx mori L.) was conducted at the Department of Sericulture,
UAS, GKVK, Bengaluru during 2014-2016. In this experiment eight treatments were
evaluated by conducting the experiment in RCBD. Among the treatments, T5 (100 %
recommended dose of N through 20 % each of compost, Glyricidia maculata, castor
cake, vermicompost and urea + 10 kg each of Azospirillum brasilense + Aspergillus
awamori bio- fertilizer + remaining P, K through chemical fertilizer + FYM 20 t/ha +
ZnSO4 7H2O @ 20 kg/ha/year) recorded higher leaf yield (65.07 ton/ha). The leaf quality
also significantly improved in this treatment recording higher total soluble protein (12.07
%), crude protein (20.24 %) and total sugar (13.08 %). In the silkworm rearing T8 (T2 +
Borax @ 2 kg/ha/year) recorded higher V instar larval weight (38. 38 g/10 larvae),
cocoon weight (1.92 g/cocoon), pupal weight (1.57 g/pupae) and shell weight (0.31
g/shell). The T5 treatment recorded higher shell ratio (16.33 %), ERR (98.44 %), higher
fibroin (21.58 μg/ml) and sericin (12.33 μg/ml) content of cocoon, grainage parameters
viz., moth emergence percentage (97.80 %), fecundity (486.67/dfl) and hatching
percentage (92.42 %). The soil properties like Higher available N (287.00 kg/ha), P
(44.40 kg/ha) and K (288.33 kg/ha) were recorded in T5. The B: C ratio of mulberry
production was higher in T5 and T8 (1: 3.21). Similarly the highest B: C ratio of cocoon
production was recorded in T3 (1:2.24).
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