Multilayered system of sand beds with closed reinforcement for low-rise foundations

The hardwood cuttings of Calliandra haematocephala, Cassia biflora, Pyrostegia venusta and Clerodendrum splendens were treated with different growth regulator concentrations and combinations (T1: NAA100 mg/l, T2: NAA 300 mg/l, T3: NAA 500 mg/l, T4: IBA100 mg/l, T5: IBA 300 mg/l, T6: IBA 500 mg/l, T7: NAA 100 mg/l + IBA 50 mg/l, T8: NAA 50 mg/l + IBA100 mg/l, T9: NAA 100 mg/l + IBA100 mg/l and T10: Control) for 12 h and planted either in polybags containing soil or in sand beds for callusing. The treatment of hardwood cuttings with T6: IBA (500 mg/l) for 12h resulted in the maximum (33.33%) mean per cent sprouting 60 days after direct planting in all the four genotypes. Among the genotypes, the per cent sprouting was significantly more in C haematocephala (47.33%), followed by P venusta (8.66%), C splendens (7.33%) and C biflora (7.33%), irrespective of the growth regulator treatment. The hard-wood cuttings, planted in the sand beds for callusing (2 weeks) exhibited the maximum (28.33%) mean per cent sprouting with T6: IBA (500 mg/l, 12h), 60 days after transplanting in the polybags in all the four genotypes. Among the geno-types, the per cent sprouting was significantly more in C haematocephala (48.67%), followed by P venusta (6.67%) and C splendens (2.67%), irrespective of the growth regulator treatment, however, the cuttings failed to exhibit sproutingin C biflora. The treatment of cutting with IBA 500 mg/l increase the sprouting percentage in C haematocephala, P venusta and C splendens which otherwise were difficult to propagate through cutting.

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Periodic JöKulhlaups from Pleistocene Glacial Lake Missoula—New Evidence from Varved Sediment in Northern Idaho and Washington

Quaternary Research ◽

10.1016/0033-5894(84)90005-x ◽

1984 ◽

Vol 22 (1) ◽

pp. 46-58 ◽

Cited By ~ 50

Author(s):

Richard B. Waitt

Keyword(s):

Ice Sheet ◽

Glacial Lake ◽

Gravel Beds ◽

Varved Sediment ◽

Cordilleran Ice Sheet ◽

Northern Idaho ◽

New Evidence ◽

Stratigraphic Succession ◽

Conventional Idea ◽

Sand Beds

Newly examined exposures in northern Idaho and Washington show that catastrophic floods from glacial Lake Missoula during late Wisconsin time were repeated, brief jökulhlaups separated by decades of quiet glaciolacustrine and subaerial conditions. Glacial Priest Lake, dammed in the Priest River valley by a tongue of the Purcell trench lobe of the Cordilleran ice sheet, generally accumulated varved mud; the varved mud is sharply interrupted by 14 sand beds deposited by upvalley-running currents. The sand beds are texturally and structurally similar to slackwater sediment in valleys in southern Washington that were backflooded by outbursts from glacial Lake Missoula. Beds of varved mud also accumulated in glacial Lake Spokane (or Columbia?) in Latah Creek valley and elsewhere in northeastern Washington; the mud beds were disrupted, in places violently, during emplacement of each of 16 or more thick flood-gravel beds. This history corroborates evidence from southern Washington that only one graded bed is deposited per flood, refuting a conventional idea that many beds accumulated per flood. The total number of such floodlaid beds in stratigraphic succession near Spokane is at least 28. The mud beds between most of the floodlaid beds in these valleys each consist of between 20 and 55 silt-to-clay varves. Lacustrine environments in northern Idaho and Washington therefore persisted for two to six decades between regularly recurring, colossal floods from glacial Lake Missoula.

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