肥料の撒き方の違いによる斜面からの養分流出に関する研究

概要

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This research was done to study the relationship the effect of method fertilization and rainfall intensity to the losses of nutrients in surface runoff. The results of this experiment showed that nutrients concentration in runoff of the parameters analyses that were significantly higher than that of original water. Ratios of contents of the most nutrients (T-N, NH_4-N, NO_3-N, T-P, PO_4-P) in runoff from broadcasting per subsurface of 1cm depth fertilizer application are more than 1.0, leaching of nutrients content was high when rainfall high and on the first time after rain event nutrients content also losses most high in runoff. Nutrient losses in runoff depend on dissolution of granular fertilizer in runoff. Fertilization can rapidly increase the nutrient concentration in runoff, which varies with the methods of fertilization and forms and elements of the nutrients. The concentration of nutrients in runoff was mostly related to the nutrient content of the very shallow surface soil. Data collected in this study may be useful as estimates of maximum losses from runoff under similar farming practices. Such determine the loss potential of fertilizers under high rainfall conditions.
日本雨水資源化システム学会の論文