Study of characteristic environments and increasing productivity of the field crops in sand dunes and arid lands

在墨西哥下加利福尼亚州沿海沙丘区高温低湿条件下，开展了油菜增产研究的基础研究。显著钩。f.et托马斯。萝卜（Raphanus sativus L.）、白菜（Brassica chinensis L.）、莴苣（lacuca sativa L. var capitata L.）和绿首菜。在栽培过程中，我们试验了多种节水栽培技术：滴灌、打孔灌溉、保水性物质的使用、灌溉次数和水量的控制。同时，利用除湿机提供的空气湿度提供的优质水，考察了苗床内植物的生长情况。下加利福尼亚州地下水的E.C值为1442us/cm，而除湿水的E.C值为266us/cm。除湿水处理的植株生长明显优于地下水处理，叶重分别为生菜的1.9倍和白菜的1.6倍。9种持水物质中，小白菜叶重增加幅度最大，增幅约为60%。他们在墨西哥得到的结果大多低于在日本得到的结果。因为灌溉水的高盐度阻碍了植物的生长。如果我们希望在沙漠中种植树木，我们应该尽快开发出一种新的耐盐保水物质。当我们用同样的灌溉水灌溉时，我们得到了更频繁的灌溉，我们得到了叶重，白菜，越来越多。

In coastal sand dunes of Baja California, Mexico under very high temperature and very low humidity, we performed the basic research for the study with increasing productivity of vegetables: (Brassica campestris L. subsp.napus Hook. f.et Thoms. var.komatuna Makino), radish(Raphanus sativus L.), Bekana, Pak-choi (Brassica chinensis L.), head lettuce(lactuca sativa L. var capitata L.), and Greendebut. When we cultivated them, we tested many kinds of cultivation techniques for spending the less amount of water: the drip irrigation, the perforated irrigation, the use of water holding substances and controlling the irrihation with the frequency and the amount of water. At the same time we investigated the plants growth in seeding beds by the water of good quality, which was given from air humidity by dehumidifying machine.In Baja California the underground water had the value of E.C.,1442us/cm, but dehumidifying water was very good,E.C.,266us/cm. The plants growth by dehumidifying water was shown to be signifficantly better than that by underground water, with leaf weight by lettuse, 1.9 times and Pak-choi, 1.6 times. In 9 kinds of water holding substances the increase of the leaf weight, Pak-choi, arised and the greatest effect of them increased about 60%. Their result in Mexico mostly got the values less than the result in Japan. Because high salinity into irrigation water prevented plants growth.Then if we hope to plant trees in desert, we should quikly develop a new salt-tolerant water holding substances. When we gave the same irrigation water, we got more frequent irrigation, we got leaf weight, Pak-choi, more increasingly.