A Split Tube Method for Soil Sampling

Gerwitz, A.

doi:10.2307/2401837

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Diagnostic microwear patterns are associated with specific worked materials and different modes of tool use (Keeley 1980). Most agree that microwear analysis will yield valid functional information, but there has been some disagreement over which technique should be employed (Gerwitz 1980). A low-power method that uses magnifications between lOx and lOOx to examine implements under reflected light has been championed by George Odell (1980), although many others have tried this technique.…”

Section: Microwear Analysis and Activity Patternsmentioning

confidence: 99%

“…The study of striations can lead to an understanding of motor functions and scratching agents that are responsible for the wear patterns, but the SEM approach does not allow one to readily distinguish between different types of worked 186 R.W. Yerkes material (Gerwitz 1980). A method of incident light microscopy employing a magnification range between 50x and 400x has been developed by Lawrence H. Keeley (1980).…”

Section: Microwear Analysis and Activity Patternsmentioning

confidence: 99%

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Lithic Analysis and Activity Patterns at Labras Lake

Yerkes

1989

Archaeological Papers of the American

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Lithic assemblages from four small Late Archaic (1850-800 BC) settlements at the Labras Lake site (ll-S-299) on the American Bottom, Illinois were examined and compared with the chipped stone artifacts associated with the Late Woodland (AD 900) and Mississippian (AD 1235) components at the site in an investigation of changes in stone tool utilization and lithic technology. The distribution of stone tools, debitage, and debris was examined, refitted artifacts were plotted, and microwear analysis was conducted in order to define areas of tool manufacturing and repair, determine tool function, and isolate activity areas. Activities associated with each component were then summarized and compared.questions of culture, and, third, with respect to the history of peoples. (Holmes 1894:121).

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Section: Microwear Analysis and Activity Patternsmentioning

confidence: 99%

Section: Microwear Analysis and Activity Patternsmentioning

confidence: 99%

Lithic Analysis and Activity Patterns at Labras Lake

Yerkes

1989

Archaeological Papers of the American

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“…Soil samples to a depth of 90 cm from the two fields were taken using a power hammer and split tube corer (Gerwitz, 1977). These were divided into depth increments, air dried and analysed for bicarbonate extractable P, pH (1 :2 w/v aqueous suspension), cation exchange capacity, exchangeable cations and organic carbon (M. A.F.F., 1973).…”

Section: Physical and Chemical Determinationsmentioning

confidence: 99%

Variation in yield between two similar sandy loam soils. I. Description of soils and measurement of yield differences

Costigan¹,

Greenwood²,

McBurney³

1983

Journal of Soil Science

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Yields of seven different vegetable crops on one site were always much less than those on another nearby site despite the soils on both sites being of the same soil series and the incorporation of large quantities of fertilizer immediately before drilling.Severe restriction of growth on the poorer site always occurred when the plants were small. Experimental evidence showed that this restriction could not be attributed to a worse aerial environment or a poorer supply of soil nitrogen. Although there were differences in soil physical conditions these seemed unlikely to be sufficient to reduce the growth of young plants.Plants on the poorer site had much lower potassium and slightly lower phosphorus and water contents than plants on the other site.It is argued that restricted growth results from the inability of the poorer site to supply sufficient potassium and possibly phosphorus to the crop in the early stages of growth. It was also shown that these nutrient stresses could not be significantly relieved by incorporating fertilizer in any quantity, in the usual way, before drilling.

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Root development of vegetable crops

Greenwood¹,

Gerwitz²,

Stone³

et al. 1982

Plant Soil

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139

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SummaryMeasurements were made at intervals during the growth of seven different vegetable crops grown on the same soil to find how far root development and crop growth could be described by simply derived equations and to find how far the parameter values varied from crop to crop.For each crop K1 In W + W, (where W is total plant dry weight, t ha-t and K 1 is equal to 1 t ha -1) was linearly related to time from emergence, as in past experiments.The derived equationwhere L is total root length per unit area, t is time from emergence, cj and bj are coefficients that depend on the crop (j) and m is a coefficient having the same value for all crops, removed 89.4% of the total variance in In L. The best fit was obtained with a value of m that implied that about 3% of the root carbon was mineralized each day. Generally the logarithm of root density declined linearly with increasing depth. Most of the variation between the gradients of these relations for the different crops was removed by a single regression against logarithm of total root length.The main discernible differences between species in their rooting patterns were that root length for a given top weight of legumes was about half that of non legumes, that the development of storage roots was associated with a less steep decline in root density with depth than for other crops and that onions were exceptional in that the depth to which their roots penetrated did not change appreciably during much of the growing season.A single linear relationship between root depth and top weight (r 2 = 0.85) covered all nonleguminous crops except onions and another relationship (r 2 = 0.80) covered the legumes.

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A Split Tube Method for Soil Sampling

Cited by 5 publications

References 3 publications

Lithic Analysis and Activity Patterns at Labras Lake

Lithic Analysis and Activity Patterns at Labras Lake

Variation in yield between two similar sandy loam soils. I. Description of soils and measurement of yield differences

Root development of vegetable crops

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