| Summary: | 碩士 === 國立嘉義大學 === 農藝學系研究所 === 102 === The main purpose of this study was toinvestigate the effect of physiology and ecology of seed germination on Shepherd’s purse (C. bursa-pastoris L.) and Garden cress (L. virginicum L.), including different environmental factors (constant temperature, alternate temperature, water potential, salt concentration, pH, light quality, oxygen, and depth of burying) and the treatment of herbicide.
The seeds of Shepherd’s purse and Garden cress at constant temperature treatment could germinate range from 10 to25℃, using constant temperature 10℃ treatment had highest germination percentage, achieving 89.33％ on Shepherd’s purse. Shepherd’s purse and Garden cress at alternate temperature treatment had highest germination percentage were 15/10 and 20/15℃, each achieving 88.67 and 85.33％. Shepherd’s purse and Garden cress at water potential treatment could germinate range from 0 to -0.4MPa, and most suitablegerminated range from 0 to -0.2MPa, however Garden cress had better resistant ability on low water potential, that had 15.33％germination percentage in the -0.6MPa. Shepherd’s purse and Garden cress at salt concentration treatment had germinated ability from 0 to 0.6％, but salt concentration above 0.6％, the germination percentage of Shepherd’s purse is more sensitive than Garden cress. Shepherd’s purse and Garden cress at solution pH treatment both were able to germinate among from pH4 to pH 9, and had greater germination percentage among from pH6 to pH7, achieving aboveto 80%.The light quality treatment with white, red, blue and purple light on Shepherd’s purse had better germination percentage, achieving above to 84.00%. Garden cress had better germination percentage with white and red light, both achieved above to 80%. However, the far infrared and the dark environment could obviously limit the germination percentage. In the impact of light and oxygen on Shepherd’s purse and Garden cress had better germination percentage, both achieved 78.67. With light and aerobic treatment on Garden cress had better germination percentagewas 81.33％. However the germination percentage with anaerobic treatment had no significant difference between two species. But the germination percentage with dark environment with aerobic, limited anaerobic or anaerobic hadlow or none germination percentage.In the depth test of burying seeds, with the depth range from 0 to 0.4 cm had higher seedling emergency percentage. Both seeds were affected by burying depth. When the depth of 7.5 cm, that Garden cress seeds have no emergency, and the depth is 5.0 cm, Shepherd’s purse seeds have no emergency.
Atdifferent herbicides aspect, using alachlor (45.1% emulsion) in 1,500 times of concentrations had germination percentage from 10to 25%, but using 500 times made non-germination between two species seeds. Using Pendimethalin (34% emulsion) with 125 times of concentration made the germination percentage from 11 to 28%, but using 75 times made non-germination between two species seeds. Using paraquat (24% solution) with 2,000 times of concentration had germination percentage from30 to 37%, but using 1,000 times made non-germination between two species seeds. And using glyphosate isopropylamine salt (41% solution) 250 times of concentration had germination percentage from 15 to 33%.Therefore,using alachlorandparaquat have major effects of germination on Shepherd’s purse and Garden cress seeds.
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