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Study on measures to prevent fine red soil particles from runoff using chemical fertilizers

化肥防治红壤细颗粒径流措施研究

基本信息

批准号：
14560203
负责人：
YOSHINAGA Anshun
金额：
$ 2.24万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14560203/
关键词：
red soil runoff chemical fertilizer dispersion flocculation and sedimentation fine soil particle suspended sediment specific absorption of the phosphoric colloid 凝集沈降抑制

项目摘要

This study was done with the Grant-in-Aid for Scientific Research.It became clear that chemical fertilizers dispersed up soil particles and prevented soil particles from settling. Because chemical fertilizers make soil particles fine, soil runoff from farmlands is accelerated, and sedimentation in settling ponds is prevented. As a result, fine soil particles flow out from farmlands and settling ponds, and then seacoast is polluted by red soil. In the experiment of the dispersion of soil by chemical fertilizers, soil particles were sifted in the pure water and the water with chemical fertilizers, and the size distributions of the waterproof aggregation of two conditions were compared.As a result, it was recognized that fine particles smaller than 0.25mm increased by adding chemical fertilizers. In the experiment that chemical fertilizer was added to water with Kunigami maji soil, it was confirmed that soil particles were dispersed by adding little chemical fertilizers and cohered by adding much.The reason of this phenomenon was supposed that electric charges changed from positive to negative by the specific absorption of the phosphoric acid, and negative electric charges increased, and fine soil particles were dispersed. However, by adding more phosphoric acid, the specific absorption of the phosphoric acid was saturated, and negative electric charges stopped to increase, and positive electric charges increased by adding more phosphoric acid, and negative charges neutralized with positive charges. This process is supposed the reason of the cohesion.

这项研究是在科学研究补助金的资助下完成的。很明显，化肥分散了土壤颗粒，防止了土壤颗粒沉降。由于化肥使土壤颗粒变细，加速了农田土壤的径流，防止了沉淀池的沉淀。其结果是，土壤细颗粒从农田和沉淀池流出，然后海岸被红壤污染。在化肥对土壤的分散试验中，分别在纯水和加有化肥的水中对土壤颗粒进行筛分，比较了两种条件下土壤防水团聚体的粒径分布，结果表明，加入化肥后，小于0.25mm的细颗粒增多。在对国上町土进行的水中添加化肥的试验中，确认了少量添加化肥时土壤颗粒分散，大量添加化肥时土壤颗粒凝聚的现象，认为这是由于磷酸的特异性吸附使电荷由正变为负，负电荷增加，使细小的土壤颗粒分散。然而，通过添加更多的磷酸，磷酸的比吸收饱和，并且负电荷停止增加，并且正电荷通过添加更多的磷酸而增加，并且负电荷被正电荷中和。这个过程被认为是凝聚力的原因。

项目成果

期刊论文数量（34）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Utilization of forest lands for agriculture and its effect on the Characters of Kunigami Mahji soil in Okinawa Island

冲绳岛林地农业利用及其对国头玛吉土壤特性的影响

DOI：
发表时间：
2004
期刊：
Proceedings of the 6^<th> International Symposium on Plant-Soil Interactions at Low pH
影响因子：
0
作者：
Yoshihiro Tokashiki;Chizuru Minami;Makoto Kitoh
通讯作者：
Makoto Kitoh

坂野美里, 吉永安俊, 酒井一人: "微細土粒子の粒径と沈降速度に関する研究"平成14年度農業土木学会大会講演会講演要旨集. 774-775 (2002)

Misato Sakano、Yasutoshi Yoshinaga、Hitoshi Sakai：“细土颗粒的粒径和沉降率的研究”2002 年日本农业和土木工程师学会会议摘要 774-775（2002）。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

沖縄に分布する土壌と科学肥料との関係

冲绳分布的土壤与科学施肥的关系

DOI：
发表时间：
2003
期刊：
日本土壌肥料学会講演要旨集 49
影响因子：
0
作者：
渡嘉敷義浩;西富麻紀;金城尚;鬼頭誠
通讯作者：
鬼頭誠

沖縄に分布する土壌と化学肥料との関係

冲绳分布的土壤与化肥的关系

DOI：
发表时间：
2003
期刊：
日本土壌肥料学会講演要旨集 49
影响因子：
0
作者：
渡嘉敷義浩;西富麻紀;金城尚;鬼頭誠
通讯作者：
鬼頭誠

On the effect of the chemical fertilizer on the sedimentation of minute soil particle

化肥对土壤微小颗粒沉降的影响

DOI：
发表时间：
2002
期刊：
The Proceedings of 10^<th> Annual congress of Rainwater Catchment Systems Association
影响因子：
0
作者：
Anshun YOSHINAGA;Kazuhito SAKAI;Misato BANNO
通讯作者：
Misato BANNO