| Summary: | 碩士 === 國立屏東科技大學 === 熱帶農業暨國際合作系 === 103 === For today’s society beautiful landscape is an important element to alleviate pressure. Turf has being extensively used for open spaces because it provides green elements to the landscape. Over-seeding is a method to improve landscape of warm-season turf grasses while it start yellowing in the winter. Three parts of experiment were conducted: (1) Seedling tray experiments (2) Roof irrigation experiment (3) second seedling tray evaluation. Two herbaceous flowers seeds: fire-wheel (Gaillardia pulchella) and moss-rose (Portulaca grandiflora Hook.) over-seeded on Zoysia tenuifolia and Paspalum vaginatum turf were tested to evaluate the feasibility of enhancing landscape scene. Four sowing rates (1, 2, 3 and 4 g/m2) were applied and growth performance were compared with the check (CK). Fire-wheel 1g/m2 showed highest fire-wheel leaf area (54.6, 38.7 and 34.7 cm2) of CK as well as two over-seeded (Zoysia and Paspalum ) treatments. However, these treatments with higher leaf area showed lower coverage rate which were 62.7%, 72.0% and 64.7%, respectively. For seedling tray experiment, overall 1g/m2 showed better growth than other sowing rates. Moss-rose showed poorly and tiny growth in over-seeding method. CK treatment showed significant better growth than those over-seeded. Moss-rose CK treatment showed 7 colors, 22-39 flowers, bigger flower size (3.8-4.3 cm) and above 35% (35-49) color ratio which was much better than two over-seeded moss-rose. Over-seeded moss-rose showed 1to 2 colors, 1to 1.5flowers and tiny flower size (1.3~2.5 cm), 1% color ratio. Roof experiments were two irrigation programs (frequent water: irrigate once per week and reduced water: irrigate once per two weeks) combined with over-seeded 0.5g and 1g herbaceous flower treatments on Zoysia and Paspalum turfs. Fire-wheel and moss-rose showed yellowing and dried in reduce water treatment at 70 days after sowing. Coverage rates of turf started from 97%, 85.7% and 81.3% then declined to 0%, 11.7% and 0% of CK, 0.5g and 1g/m2 reduce water treatments. Over-seeded Pasaplum turf treatments also showed yellowing and dried in two irrigation treatments at 40 day after sowing. Zoysia turf kept growing in reduce water treatment until 150 days after sowing with the help of irrigation and fungicide application, of Zoysia turfs recovered from almost 0% to 70% coverage rate. Second seedling tray experiments showed better moss-rose germination rate in over-seeding method. Moss-rose showed 78% and 71% germination rate of 0.5g and 1g/m2 over-seeded on Zoysia turfs which were higher than first seedling tray experiment (10~18%). Landscape potential evaluation also showed better performance than first seedling tray experiments. Number of flowers (4.2 and 4.6) and color ratio (4.9 and 7%) from 0.5g and 1g/m2 treatments showed higher than first seedling tray experiments. When conducting over-seeding, medium covered with a layer sands after sowing was the major factor which improved low germination rate, poor growth and landscape potential. Combining the results of experiments, over-seeding fire-wheel showed better growth better in green roof turf and irrigation once a week was better for turf and herbaceous plants growth. Two seedling tray experiments showed difference in growth on over-seeded moss-rose. However, covered a layer of sand after over-seeded can better improved tiny seeds germination and growth.
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