The Distribution of Moisture Content in an Alluvial Sandy Paddy Field in Chiba Prefecture
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- TABUCHI Toshio
- Faculty of Agriculture, University of Tokyo
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- SATO Masayoshi
- Faculty of Agriculture, University of Tokyo
Bibliographic Information
- Other Title
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- 千葉県の沖積砂質土水田の含水比分布
- 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)
Abstract
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.
Journal
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- Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering 1971 (36), 28-32, 1971
The Japanese Society of Irrigation, Drainage and Rural Engineering
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Details 詳細情報について
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- CRID
- 1390001204541334400
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- NII Article ID
- 130004118318
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- ISSN
- 18847234
- 03872335
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed