盆栽介質對矮牽牛生長與開花之影響

Effect of Potting Media on Growth and Flowering of Petunia hybrida Vilm. 'White Cascade'

以等體積之砂與木屑，或砂、木屑與胺化花生殼混合之無土盆栽介質，與臺灣現行傳統盆土，及擬西方現行採用標準盆土相較，研究不同介質對矮牽牛生長、開花與品質之影響。結果初期生長各介質效果相若；後期生長，土拌堆肥者最差，其他四介質相若。始花最早者，依次為1土：1水苔：1真珠砂＞1水苔：1（石至）石＞1砂：1木屑＞土（2砂壤：1堆肥）＞1砂：1木屑：1胺化花生殼。砂拌有木屑，或木屑與胺化花生殼者，雖始花較慢，但植株生長緊密，品質佳。各介質之物理性狀。皆在前人研究認為滿意之節圍內。由本試驗結果行知，砂拌木屑，或再加入部份胺化花生殼，是經濟可行之盆栽介質。但經十二種草本植物，種子發芽與幼苗生長之生物檢定。顯示新鮮杉木屑，具有生長抑制物質存在，不利種子發芽幼苗生長，不宜拌入種子發芽用之培養土中，作者於文內並討論其可能之致因。

petunia hybrida Vilm. cv ”White Cascade” plants were grown in three soilless media and 2 soils amended with sphagnum moss, perlite or with compost. The plant responses in the different media were superior to those in the control medium of 2 parts soil and 1 part compost at the end of this experiment. Soilless mixtures containing equal part of sand and sawdust, or equal parts of sand, sawdust and ammoniated peanut hull, were satisfactory for plant growth. There were no differences between these fir sawdust mixtures and two types of standard potting media, namely, soil-moss-perlite mix and moss-vermiculite mix. The physical characteristics of the media were within the ranges defined as satisfactory by previous researchers. The germination and seedling growth of 12 annual herbaceous plants were suppressed by the use of fresh fir sawdust, the different responses in potting and germination medium were discussed.