RESPONSE OF VICTORY-1 MULBERRY TO DIFFERENT SOURCES OF ORGANIC MANURES AND THEIR IMPACT ON GROWTH AND DEVELOPMENT OF SILKWORM
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Date
2007-10-22
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
The efficacy of different sources of organic manures (vermicompost, enriched
vermicompost, FY^, coirpith compost, urban solid waste compost and biodigested
slurry) was evaluated as nitrogen source in V-1 irrigated mulberry. The organic
manures were used to supply 100% recommended nitrogen, while the recommended
phosphorus and potassium were supplied through chemical fertilizers. The mulberry
thus obtained was fed to silkworms (PM x CSR-2 and PM x NB4D2) to know the
economic characters.
Application of vermicompost + recommended P and K to mulberry resulted in
significantly higher plant height, number of shoots / plant, number of leaves / plant
and leaf yield, while the leaf area index was higher with vermicompost and enriched
vermicompost + recommended P and K and recommended FYM and NPK.
Moisture content of leaf was more in mulberry supplied with coir pith
compost + recommended P and K, while crude protein, total carbohydrates,
chlorophyll *a', chlorophyll 'b\ total chlorophyll, nitrogen, phosphorus, potassium,
calcium, magnesium and sulphur contents were higher in both vermicompost and
enriched vermicompost along with recommended P and K.
The silkworms fed on mulberry grown by application of vermicompost and
enriched vermicompost along with recommended P and K registered more mature
larval weight, effective rate of rearing, cocoon yield, cocoon weight, shell weight,
shell ratio, silk productivity, cocoon filament length and fibroin with least mature
larval duration, disease incidence, denier and sericin in both the silkworm hybrids.
The study revealed that the growth, yield and quality parameters of mulberry
were enhanced when organic manures were used as nitrogen source. Further,
silkworms fed on mulberry leaves obtained by the application of organic manures
registered enhanced economic characters. However, from the economic point of
view, there is a need to explore the possibilities of combining different organic,
inorganic and bio-resources of nutrients to maximize cocoon production.
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