单词	hardpan
释义	hardpan /ˈhɑːdpan / noun [mass noun] Geology A hardened impervious layer, typically of clay, occurring in or below the soil and impairing drainage and plant growth.A hardpan or impervious layer of soil (called caliche in the Southwest's low deserts) might be the cause.... The simplest way to see if your soil has a hardpan or compaction layer below the surface is to take a metal rod and walk around your property sticking it into the ground. A reader in Tucson says he plays public courses where the greenside bunkers have just a thin layer of sand over hardpan.
随便看	ESN ESOL ESOP esophagal esophagitis esophagoscope esophagoscopy esophagus Esopic Esopism esoteric esoterica esoterically esotericism esotericist ESP esp. espada espadrille espalier esparto esparto grass España especial especially

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