Changes in soil chemical properties and nutrient accumulation in a 34-year experiment with NPK and compost applications to grassland

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  • YAMADA Daigo
    Natl. Inst. Livest. Grassi. Sci., Miyota Res. Stn.
  • SHIBUYA Takeshi
    Natl. Inst. Livest. Grassi. Sci., Miyota Res. Stn.:(Present office)Natl. Inst. Livest. Grassi. Sci., Nasu Res. Stn.
  • KOJIMA Makoto
    Natl. Inst. Livest. Grassi. Sci., Miyota Res. Stn.:(Present office)Natl. Agric. Res. Cent.
  • MURAKAMI Hiroharu
    Natl. Inst. Livest. Grassi. Sci., Miyota Res. Stn.:(Present office)Natl. Agric. Res. Cent. West. Reg., Ayabe Res. Stn.

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Other Title
  • 肥料三要素,堆肥長期連用試験草地での連用34年間における土壌の化学性の変化と養分蓄積
  • ヒリョウ サン ヨウソ,タイヒ チョウキ レンヨウ シケン クサチ デ ノ レンヨウ 34ネンカン ニ オケル ドジョウ ノ カガクセイ ノ ヘンカ ト ヨウブン チクセキ
  • ヒリョウ 3 ヨウソ タイヒ チョウキ レンヨウ シケン ソウチ デ ノ レンヨウ 34ネンカン ニ オケル ドジョウ ノ カガクセイ ノ ヘンカ ト ヨウブン チクセキ

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This study was designed to evaluate the effects of fertilizer and compost applications on soil in grasslands intended for long-term use. We examined the changes in soil chemical properties (pH (H_2O), total nitrogen [TN], available phosphate [AP], and exchangeable potassium [EK]) and nutrient accumulation in the top 30 cm of soil in the 35th year in an experimental field where we are testing different combinations of nitrogen (N), phosphate (P), potassium (K), and compost application. pH (H_2O) to a depth of 15 cm was lowest in the N and NK plots without compost. pH (H_2O) at all depths tended to be higher in all but two treatments than before grassland establishment. The TN content to a depth of 5 cm was higher than at other depths, and tended to be higher in NPK plots without compost and in all compost plots than before grassland establishment. The AP content to a depth of 5 cm was remarkably high in fertilizer P-treated plots without compost and in all compost plots. The EK content was higher at all depths in fertilizer K-treated plots without compost and in all compost plots, and these levels were considerably higher than before grassland establishment. On the basis of the comparisons between the total soil nutrients at a depth of 30 cm and fertilizers, AP accumulation in fertilizer P-treated plots and EK accumulation in fertilizer K-treated plots without compost and in all compost plots were remarkably high. Therefore, reducing the use of P and K fertilizers on the basis of soil testing is important for optimal long-term use of the grassland.

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