土性と窒素施用量の相違がカラタチ台温州ミカン1年生苗木の生長に及ぼす影響

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Growth and absorption of nutrient elements were observed in one-year-old satsuma trees on trifoliate orange rootstock, that were planted in ungrazed pots containing four kinds of soils : sand, sandy loam, loam and clay loam. Three levels of nitrogen in the form of ammonium sulfate were supplied to the trees. From the viewpoint of new shoot length and total fresh weight of tree, the most adapted soils were sandy loam at the low nitrogen level and clay loam at the standard and high level. In all the trees, the development of the top and the root were inferior in sandy soil compared with the other soils. The high nitrogen level depressed the growth of roots in sandy soil, showing high nitrogen contents in leaves.カラタチ台温州ミカン1年生苗木を, 人為的に調整した4種の土性の土壌(砂土, 砂壌土, 壌土, 埴壌土)に裁植し, これに硫安を用いた窒素施用量の3段階(半量, 標準, 倍量)を組み合せた処理を行い, 苗木の生長量および肥料要素の吸収量を比較した. その結果, 新梢伸長量および樹体の生体重よりみて, 窒素半量区では砂壌土で, 窒素標準区および倍量区では埴壌土で最も生育が優れた. 砂土では窒素の吸収が過剰になりやすく, 窒素倍量区では根の生長も抑制され, いずれの土性の区より生長量が劣った.
1982-03-20