참외용 수경재배시스템에서의 순환배양액의 무기이온 함량의 변화 = Changes of Nutrient Contents of Circulating Solution in Three Different New Hydroponics for Oriental Melons (Cucumis melo L. var. makuwa Mak.)

다국어 초록 (Multilingual Abstract)

A new circulating hydroponic system was invented for oriental melons grown in the greenhouse. Fordeveloping nutrient solution management techniques, we examined the changes of nutrient contents ofcirculating solution in three different types of new hydroponic systems. The yield and fruit quality oforiental melons in hydroponics were better than those in soil culture. The substrate culture wasappropriate for hydroponics of oriental melons, and NFT was turned to be the opposite due to thephysiological disorder during hot seasons. Yamazaki's melon solution with EC 2.0 dSm-1 was themost appropriate for oriental melons. The new circulating hydroponic system seemed to be appropri-ate for oriental melons because of the stable EC, pH and the macro- and micro-element contents.NO3-N, Ca and Mg contents in the circulating solution kept a good balance in all types of hydropon-ics. However, P content, compared to other types, decreased by the degree of 1 me L-1 in perlitemedium. K content showed irregular status in perlite but showed the stable status in cocopeat. Gen-erally, microelements, except Mo, showed stable absorption in the substrate culture. However, in NFT,most of the elements showed irregular absorption except B and Mn. Microelement absorption, espe-cially Cu, Zn and Mo, decreased during hot seasons.