[Organic wastes utilization of silk worm rearing on mulberry plantation to improve natural silk quality]
2000
Handayanto, E. | Nuraini, Y. | Hairiah, K. (Universitas Brawijaya, Malang (Indonesia))
A study aimed to elucidate the potential use of organic wastes of the silkworm rearing of PSA Pare for improving production and quality of mulberry leaves as well as production and quality of silk, through soil fertility improvement, was carried out in the field and in a laboratory. The study consisted of three stages, i.e. N mineralization of the organic wastes, production and quality of mulberry leaves due to application of the organic wastes to the soil, and a silk worm rearing to measure production and quality of silkworm cocoon and silk. Results of the study showed that the organic wastes provided high N content available for plant uptake, especially for the unused green leaf feed. The amount of N released from the organic wastes was determined by quality of the wastes. Under leaching conditions (laboratory and field), the most predominat quality factors was (lignin+polyphenol)/N ratio, whereas under non-leaching conditions (laboratory), the protein-binding capacity of polyphenol was the most critical factor determining the rate of N release. After 14 weeks, unused green leaf feed, fresh silkworm dung, old silkworm dung collected from outside the rearing barracks, and manure imported elsewhere, provided 91.6, 85.5, 69.8 and 82.2 kg N/ha, respectively. Application of the organic wastes in the field improved biomass production and quality of mulberry leaves. A combination of 5-10 ton/ha of unused green leaf feed and 100 kg N/ha in the form of urea improved growth of the silkworm and quality of the silk produced
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