【摘 要】
：
In recent years the numbers of dragonflies are decreasing in Japan.However quantitative analysis on the ecosystem of paddy fields had not been finished.Therefore,to analyze present state of ecosystem
【机 构】
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Laboratory of Environmental Soil Physics,Faculty of Agriculture,Niigata University,Japan
【出 处】
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The 4th International Symposium on "Modern Agriculture and
论文部分内容阅读
In recent years the numbers of dragonflies are decreasing in Japan.However quantitative analysis on the ecosystem of paddy fields had not been finished.Therefore,to analyze present state of ecosystem of paddy fields,in the respect of ecology of dragonfly,soil physics and rice production manner.Concretely,we studied the relationship among number of dragonfly emergences,quality and quantity of pesticide,water management and soil particle size analysis of paddy fields at Niigata prefecture,Japan.Here we use pesticide as the generic name of herbicide,insecticide and fungicide.
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