著者

Hiroyuki ARITA Tatsumi TOMOSYO Hidesato KAWARA

出版者

The Japanese Society of Irrigation, Drainage and Rural Engineering

雑誌

Rural and Environment Engineering (ISSN:02878607)

巻号頁・発行日

vol.2002, no.42, pp.44-59, 2002 (Released:2010-10-27)

参考文献数

23

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In devising an agricultural policy in Japan, the difficulty lies in that the policy must deal with the unpredictability of the food supply in the long-term perspective, while acting on the present structure of agricultural production which has been producing shortterm excesses. Considering the quite unfavorable conditions determining agricultural land resources in Japan (e.g., an absolute shortage of farmland resources that is aggravated because existing farms are frequently abandoned), it is necessary to separate the issue of agricultural land resource conservation from the issue of achieving the target of food selfsufficiency, and to take the necessary measures for agricultural land resource conservation immediately. The core of farmland policy lies in conservation of the agricultural land resources as such, and this issue is more serious than the issue of food self-sufficiency as related to the utilization of these land resources. This paper will propose extensive management as a means of conserving agricultural land resources and discuss basic concepts pertaining to this form of agricultural management.

著者

甲本 達也

出版者

社団法人 農業農村工学会

雑誌

Rural and Environment Engineering (ISSN:03872335)

巻号頁・発行日

vol.1990, no.146, pp.95-100,a2, 1990

被引用文献数

2

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粘土の液性・塑性両限界決定のためのフォールコーンテストの適用性について検討した。テストは種々の粘土について, 60°, 0.6Nコーンおよび直径100mm, 深さ50mmの容器を用いて行った。テストによれば, いずれの粘土の場合も貫入量~含水比関係は幅広い含水比の範囲においては両対数紙上で直線で表されることがわかった。この貫入量~含水比直線関係を用い, 貫入量が12.0mmおよび1.3mmに対する含水比を読取ると, それらはカサグランデ法による液性限界および塑性限界に相当することが明らかとなった。