| 41. | In the area of the finds, the ground was originally covered by a shallow, loose soil sitting atop a hardpan layer.
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| 42. | Iron and aluminium content is high, which causes hardpans, duracrust, or cuirasses to form near the surface due to oxidation.
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| 43. | Common salts such as sodium ions contained in wastewater can fulfil this role and lead to a localized hardpan in some soil types.
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| 44. | The dandelion is also one of several species which break up hardpan in overly cultivated fields, helping crops grow deeper root systems.
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| 45. | Low pH conditions support formation of an iron hardpan, preventing the trees from setting deep roots and preventing internal drainage of soil water.
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| 46. | If you're hitting off dirt or hardpan, be sure to put the ball farther back in your stance to assure solid contact.
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| 47. | Wind and dust forced Noble and Craig Breedlove's rival Spirit of America team to huddle in their makeshift garages on the hardpan playa.
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| 48. | This because a layer of hardpan just below the loam prevented good drainage and kept the plants from getting their roots to the soil below.
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| 49. | Deep, poorly drained acidic sandy soils are typical for the area; they have gray topsoil, white subsoil, and a dark hardpan.
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| 50. | Cultivator teeth work near the surface, usually for weed control, whereas chisel plow shanks work deep beneath the surface, breaking up hardpan.
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