Knowledge (XXG)

Duplex soil

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784: 60:(texture contrast and type of boundary between horizons A and B) and the colour is used for their differentiation (i.e. brown, red and yellow duplex soils). Under the Australian Soil Classification they can be included in different orders such as Podosols, Sodosol, Chromosols or Kurosols. 153:
Tennant, D, G Scholz, J Dixon, and B Purdie. 1992. Physical and chemical characteristics of duplex soils and their distribution in the south-west of Western Australia. Australian Journal of Experimental Agriculture 32
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Gardner, WK, RG Fawcett, GR Steed, JE Pratley, DM Whitfield, Hvan Rees, and Rees H Van. 1992. Crop production on duplex soils in south-eastern Australia. Australian Journal of Experimental Agriculture 32
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Isbell, Raymond, and Ebooks Corporation. 2002. The Australian Soil Classification : Revised Edition. In Australian Soil and Land Survey Handbooks, 4. 153 p. Melbourne: CSIRO PUBLISHING.
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Northcote, K. H., and CSIRO. 1979. A factual key for the recognition of Australian soils / by K.H. Northcote. 4th ed. Adelaide, S. Aust: Rellim Technical Publications.
49:. Some duplex soils are distinguished by the presence of an A2 bleached horizon, a character also used as a diagnostic key for the distinction between these type of 218: 495: 201: 479: 484: 489: 500: 20:, although such soils are found in other parts of the world. Duplex soils are also termed "texture contrast soils". 520: 505: 41:
in duplex soils is highly variable, with the top-soils ranging from coarse sand to clay loam and the subsoils from
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The diagnostic properties used by Northcote for the definition of duplex soils consider only the
79:"Subsurface Lateral Flow in Texture-Contrast (Duplex) Soils and Catchments with Shallow Bedrock" 676: 681: 119: 90: 35:. In addition, the clear to sharp change between the two horizons must occur within 0.1 m. 746: 731: 591: 721: 666: 800: 766: 651: 17: 751: 696: 57: 38: 16:
The term "duplex" is used in Australia for soils with contrasting texture between
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Hardie, Marcus A.; Richard B. Doyle; William E. Cotching; Shaun Lisson (2012).
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classification. He described a group of texture contrast soils where the
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Chittleborough, D. J. (1992). "Formation and pedology of duplex soils".
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is dominated by a texture class one and a half (or more) finer than the
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With the term "duplex soil", Northcote defined a primary profile in his
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204: 197: 190: 181: 174: 171: 165: 161: 155: 151: 142: 139: 128: 127: 107: 101: 100: 98: 74: 827: 826: 822: 821: 820: 818: 817: 816: 797: 796: 795: 790: 776: 747:Subaqueous soil 732:Serpentine soil 592:Parent material 525: 462: 389: 220: 213: 208: 178: 177: 172: 168: 162: 158: 152: 145: 140: 131: 109: 108: 104: 76: 75: 71: 66: 12: 11: 5: 825: 823: 815: 814: 809: 799: 798: 792: 791: 781: 778: 777: 775: 774: 769: 764: 759: 754: 749: 744: 739: 734: 729: 724: 722:Prime farmland 719: 714: 709: 704: 699: 694: 689: 684: 679: 677:Fuller's earth 674: 669: 667:Expansive clay 664: 659: 654: 649: 644: 639: 634: 629: 624: 619: 614: 609: 604: 599: 594: 589: 584: 579: 574: 569: 564: 559: 554: 549: 544: 539: 533: 531: 527: 526: 524: 523: 518: 513: 508: 503: 498: 493: 487: 482: 477: 470: 468: 464: 463: 461: 460: 455: 450: 445: 440: 435: 430: 425: 420: 415: 410: 405: 399: 397: 391: 390: 388: 387: 382: 377: 372: 367: 362: 357: 352: 347: 342: 337: 332: 327: 322: 317: 312: 307: 302: 297: 292: 287: 282: 277: 272: 267: 262: 257: 252: 247: 242: 237: 232: 226: 224: 215: 214: 209: 207: 206: 199: 192: 184: 176: 175: 166: 156: 143: 129: 118:(7): 815–825. 102: 68: 67: 65: 62: 13: 10: 9: 6: 4: 3: 2: 824: 813: 812:Types of soil 810: 808: 805: 804: 802: 789: 788:Types of soil 779: 773: 770: 768: 767:Tropical peat 765: 763: 760: 758: 755: 753: 750: 748: 745: 743: 740: 738: 735: 733: 730: 728: 725: 723: 720: 718: 715: 713: 710: 708: 705: 703: 700: 698: 695: 693: 690: 688: 685: 683: 680: 678: 675: 673: 670: 668: 665: 663: 660: 658: 655: 653: 652:Dry quicksand 650: 648: 645: 643: 640: 638: 635: 633: 630: 628: 625: 623: 620: 618: 615: 613: 610: 608: 605: 603: 600: 598: 595: 593: 590: 588: 585: 583: 580: 578: 575: 573: 570: 568: 565: 563: 560: 558: 555: 553: 550: 548: 545: 543: 540: 538: 535: 534: 532: 528: 522: 519: 517: 514: 512: 509: 507: 504: 502: 499: 497: 494: 491: 488: 486: 483: 481: 478: 475: 472: 471: 469: 467:Other systems 465: 459: 456: 454: 451: 449: 446: 444: 441: 439: 436: 434: 431: 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Key 801:Categories 742:Stagnogley 692:Lunar soil 647:Dark earth 632:Brickearth 597:Pedosphere 567:Soil crust 375:Technosols 360:Solonchaks 280:Ferralsols 245:Anthrosols 64:References 727:Quicksand 672:Fill dirt 612:Bulk soil 458:Vertisols 448:Spodosols 438:Mollisols 428:Histosols 413:Aridisols 385:Vertisols 380:Umbrisols 370:Stagnosol 335:Planosols 330:Phaeozems 310:Leptosols 295:Gypsisols 285:Fluvisols 265:Chernozem 260:Cambisols 255:Calcisols 250:Arenosols 45:to heavy 33:A horizon 29:B horizon 712:Paleosol 627:Blue goo 582:Gypcrust 453:Ultisols 423:Gelisols 418:Entisols 408:Andisols 403:Alfisols 365:Solonetz 355:Retisols 350:Regosols 325:Nitisols 320:Luvisols 315:Lixisols 300:Histosol 290:Gleysols 275:Durisols 270:Cryosols 240:Andosols 230:Acrisols 89:: 1–10. 662:Eluvium 622:Bay mud 587:Caliche 577:Hardpan 572:Claypan 562:Subsoil 557:Topsoil 443:Oxisols 345:Podzols 235:Alisols 223:(1998–) 39:Texture 772:Yedoma 707:Muskeg 752:Takir 687:Loess 51:soils 43:light 717:Peat 552:Loam 547:Clay 542:Silt 537:Sand 87:2012 47:clay 702:Mud 120:doi 91:doi 803:: 146:^ 132:^ 116:32 114:. 85:. 81:. 53:. 203:e 196:t 189:v 126:. 122:: 99:. 93::

Index

soil horizons
B horizon
A horizon
Texture
light
clay
soils
soil texture
"Subsurface Lateral Flow in Texture-Contrast (Duplex) Soils and Catchments with Shallow Bedrock"
doi
10.1155/2012/861358
doi
10.1071/ea9920815





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t
e
Soil classification
World Reference Base
for Soil Resources

Acrisols
Alisols
Andosols
Anthrosols
Arenosols
Calcisols
Cambisols

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