養分の動態からみた茶園土壌における施肥管理の課題

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The present study was conducted to assess the availability on soil nutrients in tea gardens considered to employ common soil management and fertilizer application. The results obtained are summarized as follows. 1. Available nitrogen was determined over a 5-week period at 30℃ with the alternate methods of leaching and incubation. Available nitrogen in the inter-row space soils throughout the year ranged from 466 t0 589 kg ha^<-1>(Typic Hapludults) and 330 to 712 kg ha^<-1>(Typic Udifluvents). The nitrogen concentrations of the soil solutions corresponding to these two soil samples ranged from 48 to 331 mg N L^<-1> and 8.3 to 573 mg N L^<-1>, respectively. Both soils possess the ability to supply an extremely large amount of nitrogen. 2. Available phosphorus in the inter-row space soils throughout the year ranged from 1.64 to 3.25 g P_2O_5kg^<-1>(Typic Hapludults) and 0.51 to 1.91 g P_2O_5kg^<-1>(Typic Udifluvents). The phosphorus concentration in the soil solution and water-soluble phosphorus content corresponding to these two soil samples were about 10^<-3>mol L^<-1> and 1,000 kg P_2O_5 ha^<-1>, respectively. In both soils, the ability to supply phosphorus exceeded phosphorus demand remarkably. 3. The value of the soil pH was very low, indicative of strong acidity. The Al concentration (Alt) in the soil solution ranged from 10^<-4> to 10^<-3> mol L^<-1>, and the Al^<3+> value became the dominant species (>98%) of the Alt value. The high Al content in tea leaf is considered to be closely associated with the characteristics of tea plants and soil management. Therefore, proper management practices have to be developed to control the harmful effect on environmental quality due to excessive nutrient supply and to maintain security and quality of the tea.
社団法人日本土壌肥料学会の論文
2000-06-05

養分の動態からみた茶園土壌における施肥管理の課題

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