부산대학교 도서관

Comparative growth was measured in Eustoma grandiflorum cultivars Chaconne White and Umi Honoka grown in continuous cropping soil treated or untreated steaming sterilization. A Tainan DARES self-developed machine (Patent # M621923) equipped with steam nails was inserted 10- cm depth into the soil and steaming (4 kg/m^2) sterilized for 5 or 10 minutes, respectively. Results showed that soil steaming sterilization increased plant growth in terms of plant height, stem diameter, flower number, and fresh and dry weights for both cultivars. Plant growth did not differ between the soil steamed for 5 or 10 minutes, while cut flower quality was marketing acceptable in those grown in continuous cropping soil after steaming sterilization for 5 minutes. What is already known on this subject? Soil sickness happened in monocultured Eustoma. A simple solar heating was effective in overcoming soil sickness but it was only practical in summer and it must be treated for a long time. What are the new findings? The soil steaming method from abroad is not suitable for the cropping system in Taiwan. Self-propelled Soil Steaming machine equipped with steam nail tubes and metal cover can reach to the deeper soil. What is the expected impact on this field? Self-propelled Soil Steaming can work all year round at anytime and reduce the problem in continuous cropping of Eustoma. It is possible to carry out annual schedule cultivation to supply cut flower for the market, and have higher greenhouse turnover rate.