```json
{
	"low": [6.5, 7.0, 7.5, 8.0, 8.5],
	"high": [10.0, 10.5, 11.0, 11.5, 12.0]
}
```
Based on prior knowledge of soybean cultivation, the number of grains per pod (NS) is an important factor that affects grain yield. Generally, soybean cultivars with a higher number of grains per pod tend to have a higher grain yield. Therefore, for the target class "high" which represents a high grain yield, the NS values are expected to be relatively higher. On the other hand, for the target class "low" which represents a low grain yield, the NS values are expected to be relatively lower.

In the provided dictionary, I have included 5 typical NS values for each target class as requested. For the "low" class, the NS values range from 6.5 to 8.5, with increments of 0.5. For the "high" class, the NS values range from 10.0 to 12.0, also with increments of 0.5. These values are just examples and may vary depending on specific cultivation practices and soybean cultivars.