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Studies on Evaluation Method for Physical Properties of Soil after Jillage

耕后土壤物理性质评价方法的研究

基本信息

批准号：
61560275
负责人：
NAOTAKA Hayashi.
金额：
$ 1.34万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61560275/
关键词：
Tillage Physical Properties of Soil Clod Size Distri bation Soil Sampler Soil Perverization Jurning of Soil 反転性電気伝導度土壌硬土

项目摘要

[1] Studies on clod size distribution (1) We discussed the approximation of the clod size distribution by log-normal Rosin-Rammler's, Gaudin-Shuman's and Weibull's distribution. In case of the approximation by Weibull's distribution, we obtained satisfactory results by means of changing the value of its shape parameter. (2) The diameter of sampler must be selected considering the average diameter of soil clod. In the case of rotary tillage, it is found that the diameter of sampler should be 200 mm on more.[2] Studies on evaluation about turning of soil (1) We succeeded in evaluating the turning percentage of soil by means of measuring the change of Ec (electric conductivity) using potassium chloride. (2) We detected the differenece of turning between up-cut rotary tillage and down-cut rotary tillage using the method. (3) The forward movement of soil after tillage is more than 25 cm and the backward one is more than 50cm.

[1]土块粒度分布的研究（1）讨论了对数正态Rosin-Rammler分布、Gaudin-Shuman分布和Weibull分布对土块粒度分布的近似。在用威布尔分布近似时，通过改变形状参数的取值，得到了满意的结果。(2)取样器直径的选择应考虑土块的平均直径。在旋耕情况下，取样器的直径宜取200 mm以上。[2]（1）利用氯化钾测定土壤电导率（Ec）的变化，成功地评价了土壤的转化率。(2)利用该方法检测了旋耕中旋耕和旋耕中旋耕的差异。(3)耕作后土壤向前移动25 cm以上，向后移动50 cm以上。