top-dressing at different stages

例句：

1. 1.The plants need regular top-dressing to stay healthy.
   这些植物需要定期施肥才能保持健康。
2. 2.The farmer applied a new fertilizer to the soil before planting.
   农民在播种前给土壤施用了新的肥料。
3. 3.The gardener added some organic matter to enrich the soil.
   园丁向土壤中添加了一些有机物质来增加土壤的肥力。