Tool whose blade loosens , weeds and aerates the soil ; it is also used to groom the soil around a plant .
用工具加工刀片松开,除草并且供气土壤;它也被用于在植物附近修饰土壤。
Fortunately , christmas island crabs aren 't just a nuisance . Their feces acts as a crucial forest fertilizer , and their burrowing turns and aerates the soil , according to the christmas island national park website .