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KMID : 1041219940360020110
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Journal of Sericultural and Entomological Science
1994 Volume.36 No. 2 p.110 ~ p.114
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Mulberry Growth Promotion by Nitrogen Application under Abnormally Wet and Cool Weather Conditions
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李梡周/Lee, Won Chu
尹明根/具泰浣/尹聖重/金光泳/Yun, Myong Kun/Goo, Tae Won/Yun, Song Joong/Kim, Kwang Young
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Abstract
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Abnormally cool and wet weather conditions during the summer of 1993 offered an opportunity to evaluate the effects of abnormal weather conditions on mulberry growth and to develop cultivation practicies to reduce leaf yield loss under the similar abnormal weather conditions. Different methods of nutrient supplementation were evaluated in Su-won and Kongju. Nitrogen was supplemented by foliar spray of urea (0.7%) or composite chemical fertilizer Jamsibiryo #8, or by the application of ammonium sulfate (60 kg/ha) to the soil. During the period between the late June and the early September which corresponds to the mulberry growing season after summer pruning, mean temperature was 1.4°C lower and precipitation 83mm higher than normal year. This weather condition in 1993 caused reduction in leaf yield by 16.4% than common year. Soil nitrogen content decreased due to higher precipitation. Leaf yield loss was reduced by the supplementation of nitrogen to the soil. Leaf nitrogen content increased with the foliar urea spray and nitrogen supplementation to the soil.
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