Seasonal Changes in Nitrogen Uptake by Pasture Plants and Soil Nitrogen Content in a Grazed Tall Fescue (Festuca arundinacea Schreb.) Pasture

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  • IIJIMA Yoshiaki
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • KUROKAWA Yuzo
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TANAKA Haruo
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • OMATA Fumio
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • SHIOYA Tetsuo
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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  • トールフェスク(Festuca arundinacea Schreb.)放牧草地における植物窒素吸収量および土壌中窒素含有量の季節変化
  • Seasonal Chnges in Nitrogen Uptake by Pasture Plants and Soil Nitrogen Content in a Grazed Tall Fescue (Festuca arundinancea Schreb.) Pasture

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Abstract

Seasonal change in nitrogen uptake by pasture plants in tall fescue (Festuca aruadiaacea Schreb.) grazed pasture during two years from 1996 to 1998 was estimated from nitrogen content of pasture plants and from the data in our previous report about net production. We compared the change in uptake to the soil nitrogen contents and discuss the interaction between pasture plants and soil nitrogen. For convenience, we divided a year into 6 periods and calculated the nitrogen uptake by pasture plants in each period. It increased during the periods May to July and August to October, which were the periods just after the fertilizer applications. At the end of each of these periods, the plant nitrogen mass increased. At the same time, available nitrogen and inorganic nitrogen in the soil increased. The 2-year average of the annual nitrogen uptake by pasture plants was 45.1gN/m^2/year, and this value was 3.1 times higher than the amount of nitrogen applied as fertilizer. It was thought that the majority of plants nitrogen uptake seems to originate from soil nitrogen. Applications of inorganic nitrogen fertilizer directly increased the soil inorganic nitrogen and increased nitro- gen uptake by pasture plants. This suggested that the increase in inorganic nitrogen in the soil reduced the competition between plant and soil microbial biomass, and consequently activated microbial biomass in the soil (priming effect). Under the C/N ratio in the present study (9.5-12.6), it is thought that the activation of soil microbial biomass leads to mineralization of soil nitrogen. To know the interaction between pasture plants and soil nutrients seems to be a key to understanding nutrient flow in grazed pastures.

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