ISHS Acta Horticulturae 659: VII International Symposium on Protected Cultivation in Mild Winter Climates: Production, Pest Management and Global Competition
SOME PHYSICAL CHARACTERISTICS OF WATER AND THEIR INFLUENCE ON EARLY GROWTH IN KOMATSUNA (BRASSICA RAPA L. NOTHOVAR) SEEDLINGS |
| Authors: | A.K. Azad, K. Ishikawa, N. Islam |
| Keywords: | Natural water, tap water, ceramics, pH, oxidation-reduction potential (ORP), surface tension (ST). |
| Abstract:
This study was undertaken to examine some physical characteristics of water and to improve irrigation water quality by different treatments. Granular ceramics having electrical charges and Kochi tap water along with A and B type of different natural water of Japan were used here in various treatments. In treated and untreated conditions the values of physical properties as shown pH and oxidation-reduction potential (ORP) were not stable up to a certain period. After each treatment in a closed system, pH increased linearly at every hour another while ORP increased highly at the initial hour of treatments, and then declined quickly, surface tension also increased significantly. From germination test in soilless culture, the growth of Komastuna seedlings (Brassica rapa L. nothovar) were greater by using the water treated by adding B type natural water with Kochi tap water compared with others. By performing this treatment, the values of pH, ORP and ST were changed to a suitable level (pH 7.24, ORP 221 mV, ST 69 dyn/cm) that may be the reasons for early growth in Komatsuna seedlings. Results suggest that adding B type natural water could be used for controlling irrigation water quality on the growth of Komatsuna seedlings. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
