| 林伟，李璟，蔡仕珍.播种时间和覆土厚度对硫华菊种子萌发和幼苗生长的影响[J].广东农业科学,2013,40(6):39-42 |
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播种时间和覆土厚度对硫华菊种子萌发和幼苗生长的影响 |
| Effects of seeding time and soil thickness on seed germination and seedling growth of Cosmos sulphureus |
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| DOI： |
| 中文关键词: 播种时间 覆土厚度 种子萌发 幼苗生长 |
| 英文关键词: seeding time soil thickness seed germination seedling growth |
| 基金项目: |
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| 摘要点击次数: 1034 |
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| 中文摘要: |
| 在实验室内观测了不同品种硫华菊种子的发芽率和发芽势，在试验田内研究了播种时间（4~8 月）和覆土厚度（0.3、0.8、1.6、2.4、3.0 cm）对硫华菊种子出苗率、幼苗株高和幼苗死亡率的影响。结果表明：不同品种间硫华菊种子的发芽率和发芽势差异较大，其中黄色品种的发芽率和发芽势分别为88.33%和81.67%，橙色品种的发芽率和发芽势分别为80.67%和68.67%，红色品种的发芽率和发芽势分别为66.67%和47.33%。覆土厚度大于0.3 cm时，随着覆土厚度的增加，出苗率明显降低；覆土厚度大于0.8 cm 时，随着覆土厚度的增加，幼苗死亡率显著上升；覆土厚度小于2.4 cm 时，苗高差异不明显；覆土厚度为3.0 cm时，不能出苗。8 月播种的幼苗死亡率最高，7月播种有部分死苗，4~6 月播种没有死苗。综上所述，硫华菊单位面积播种量较少的是黄色品种，适宜播种时间为4~6 月，适宜覆土厚度为0.3~0.8 cm。 |
| 英文摘要: |
| Germination rate and germination vigor of different Cosmos sulphureus varieties were studied under laboratory conditions,
and the effect of seeding time (April to August) and cover thickness (0.3, 0.8, 1.6, 2.4 and 3.0 cm) on the emergence rate, seedling height and seedling mortality were also studied in experimental field. The results showed that the germination rate and germination vigor with different varieties of Cosmos sulphureus had a large difference, the germination rate and germination vigor of Yellow variety were 88.33% and 81.67% respectively, the germination rate and germination vigor of Orange variety were 80.67% and 68.67% respectively, the germination rate and germination vigor of Red variety were 66.67% and 47.33% respectively. When the cover thickness was greater than 0.3 cm, the emergence rate decreased obviously as the cover thickness added. When the cover thickness was greater than 0.8 cm, the seedling mortality increased significantly as the cover thickness added. When the cover thickness was lower than 2.4 cm, the difference of seedling height wasn’t obvious, and when the cover thickness was 3.0 cm, no seedlings emerged. The seedling mortality was the highest at August, and a few of seedlings were dead at July, no seedlings dead from April to June. In a word, the less sowing seed quantity of per unit of Cosmos sulphureus was the Yellow variety, the appropriate seeding time was April to June and the appropriate cover thickness was 0.3 cm to 0.8 cm. |
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