STUDIES ABOUT THE SEAWATER USE TO HORTICULTURAL CROP IN DRY REGIONS

本文对利用海水灌溉和稀释海水中矿质养分进行了研究。这项研究进行了两年。以菠菜、小白菜等蔬菜为研究对象。结果不能证明稀释后的海水对作物种植有用。由于土壤表面蒸发程度对土壤含硫量的影响不同，因此必须正确测定土壤水分。为此，研制了用于沙丘的土壤湿度传感器，并对传感器的实际应用进行了探讨。标记上的传感器由于温度的影响会产生误差，因此这些传感器不能用于作物栽培。因此，研制了一种不受温度影响的传感器。在科学杂志上详细介绍了传感器的发展和特点。采用先进的传感器在温室栽培莴苣。结果表明，该传感器灌溉装置可以实现砂床栽培的自动灌溉。另一方面，研究了泡状丛枝菌根（VAM）抗旱性的研究进展。灌溉是由传感器自动完成的，但VAM的效果没有得到证实。

On this study for crop cultivation in sand dune using of seawater to irrigate and mineral nutrient in diluted seawater were investigated. This study was practiced in two years. Spinach and pakchoi and so on were cultivated in this study. The results could not certify diluted seawater was useful on crop cultivation. Because degree of evaporation from soil surface was different on sult concentration, soil water must be measured correctly.Therefore soil moisture tention sensor to use on sand dune was developed, and practical use of sensor was investigated. The sensors being on the marker had errors by temperature, so these sensors must not be used on crop cultivation. Consequently a sensor was not affected by temperature was developed. Details of the development and characteristic of the sensor to scientific magazine.Lettuce was cultivated with developed sensor in greenhouse. In result, squipment to irrigate with the sensor could irrigate automatically on bed cultivation with sand was proved. Other hand, progress of ddrought resistance by vesicular-arbuscula mycorrhizae(VAM) was studied. Irrigation was done automatically by the sensor, but effect of VAM was not certified.