Studies on Soilless Medium Film Culture Technique in Pak-choi 'San Feng' (Brassica campestris L. Chinensis Group)

Autor: Min-Chi Huang, 黃敏奇
Rok vydání: 2004
Druh dokumentu: 學位論文 ; thesis
Popis: 92
The objectives of this study were to evaluate the feasibility of using medium film culture techniques in automatic conveyer system for short season vegetable production. ‘San-Feng’ pak-choi (Brassica campestris L. Chinensis Group) was used as plant materials and peat moss (PM), golden mushroom compost (GMC), rice hull (RH), and perlite (PR) as soilless mediums. Media either from commercial or from self-designed formulas were tested in different thickness for pak-choi growth. Results indicated that as the material Florafleur-001H medium thickness decreased from 3 cm to 1 cm, medium temperature, electrical conductivity (EC) increased, and leaf turgor decreased also during the early growth stage. Plant heights, stem diameters, leaf numbers, leaf sizes, and dry weights were decreased significantly also as medium thickness decreased. The best yields of 3.70 kg/m2 was obtained on the medium thickness at 3 cm. Since the air filled porosity (AFP) of mediums decreased from 10% to 14.9% at 1 cm thick. This caused great inconvenience in cultivation management. Commercial medium amendment by adding 10~30% of RH or 20~40% of PR could increase AFP by 1.5% to 2.5%. Among the physical characteristics analysis of GMC, PM, RH, PR, and soil, the container capacity (CC) of GM and PM were 58-67% and 67-77%, respectively, and were significantly higher than all other materials. As the height of container increased, CC decreased, AFP increased. Although the easily available water (EAW) content was not significant different among tested medium materials, the EAW of all materials in taller containers were found higher than those in shorter one. In the contrary, the water buffer capacity (WBC) in shorter containers was significantly less than that of taller containers. RH and PR had the highest portion of particle size above 2 mm thus had the highest AFP at 80-86% and 44-51%, respectively. Three different medium formulas were designed according to the physical and chemical characteristics of tested medium materials. The best plant growth and highest final yield was obtained from the formula of PM: GMC: RH = 3:2:1 (v/v) which had TP, AFP, CC, EAW, WBC, and BD for 94.7%, 39.6%, 55%, 23.5%, 7.7%, and 0.12g/cm3, respectively.
Databáze: Networked Digital Library of Theses & Dissertations
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