千葉県の沖積砂質土水田の含水比分布

DOI

書誌事項

タイトル別名
  • The Distribution of Moisture Content in an Alluvial Sandy Paddy Field in Chiba Prefecture
  • The foundmmental studies on the soil samplinginfarm land (V)
  • 農地土壌のサンブリングに関する基礎研究 (V)

抄録

The authors have measured moisture ratios in an alluvial sandy paddy-field in Chiba prefecture, for two times one in December 1969, and another in March 1970. Fine weather lasts from December to March in this district, and the ground is not covered with snow in the winter.<BR>The length of the longer side of an usual paddy-field is 100m, and the shorter side is 30m. in length, and the measurement was done in a part of it (at an area of 100×16m). Numbers of sampling done at one point in each 2×2m section, were 400, and those of other concentrated sampling in some small area, were 30. The sampling depth was 0-5cm from the soil surface.<BR>Sample number n, sample mean value x, unbiased variance σ2, standard deviation s, coefficient of variation Cv, and confidence intervals of means and variances are given in the Table.<BR>The distribution of values proved to be not in normal state (Fig. 3, 4, 5).<BR>The value of Cv attained some 15%, and so, many samples are needed for getting a greater accuracy.

収録刊行物

詳細情報 詳細情報について

  • CRID
    1390001204541334400
  • NII論文ID
    130004118318
  • DOI
    10.11408/jsidre1965.1971.36_28
  • ISSN
    18847234
    03872335
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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