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Studies on Soilless Medium Film Culture Technique in Pak-choi 'San Feng' (Brassica campestris L. Chinensis Group)
Moisture retention curves
分析金針菇木屑堆肥、泥炭苔、稻殼、真珠石與土壤之介質理化性質。不同容器高度之介質容器容水量以金針菇木屑堆肥與泥炭苔最高分別可達58-67%與67-77%之間，隨著容器高度增加，介質容器容水量降低，相對充氣孔隙度增加之趨勢。在容器中介質體積有效水含量無顯著差異，但是高容器者之介質體積及有效水高於淺容器者，相對淺容器中之介質體積緩衝水大於高容器者。稻殼與真珠石於>2.0㎜之粒徑所佔比例最高，稻殼介質充氣孔隙可達80-86%，真珠石則有44-51%。以泥炭苔、金針菇木屑堆肥、稻殼三種介質材料作為配方設計在小白菜之生長盛期達到最低之通氣需求後，介質有效水含量愈高者，能夠提高愈多之介質水分供應作物之生長與發育之用，其中以泥炭苔、金針菇木屑堆肥、稻殼 = 3：2：1能達到這種需求，予以提高小白菜葉片之光合作用速率，因此在介質配方設計其所得之產量最高。|
Abstract 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.
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