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KMID : 1041219930350020086
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Journal of Sericultural and Entomological Science
1993 Volume.35 No. 2 p.86 ~ p.88
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Effect of Number of Days After Urea Foliar Spray on Mulberry Leaf Components and Silkworms
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李梡周/Lee, Won Chu
金三銀/韓修貞/尹聖重/Kim, Sam Eun/Han, Soo Jung/Yun, Song Joong
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Abstract
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The effect of short term duration(1, 2 and 3 days) after urea foliar spray on leaf quality was investigated by chemical analysis of leaves and silkworm rearing with leaves treated with urea in autumn. Foliar spray increased water content by 0.4~O.7% and total nitrogen by 0.19~0.51% in leaves compared to the conventional treatment. Foliar spray increased NO3-N concentration in leaf 503 ~ 1107 ppm more than the conventional treatment NO3-N concentration in leaf decreased with days after foliar spray. Whole cocoon weight and cocoon shell weight increased by 0.02~0.14 g and 0.5~3.1 cg, respectively in foliar spray than in the conventional treatment. Though foliar spray raised NO3-N concentration in leaf, leaves harvested one day after foliar spray were no harmful to silkworms.
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