按照nature写作标准润色下面这句话降低重复率：Soil samples from the 0–30 cm 0–10 cm 10–20 cm 20–30 cm layer were collected prior to sowing and after harvesting in 2017 and 2018 The collection method was based on a five-po

In 2017 and 2018, soil samples were collected from four different layers (0-10 cm, 10-20 cm, 20-30 cm, and 0-30 cm) before sowing and after harvesting. The collection process involved using a 5-cm diameter soil auger to drill the soil at five different points, followed by analysis of nutrient content and soil water content (SWC).