Relation of Moisture Equivalent to Field Capacity and Moisture Retained at 15 Atmospheres Pressure to the Wilting Percentage<sup>1</sup>

Peele, T. C.; Beale, O. W.

doi:10.2134/agronj1950.00021962004200120006x

Cited by 5 publications

(3 citation statements)

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“…The soil moisture studies reported here involved sampling the upper 5 or 10 dm of the mineral soil profiles to determine water contents of each decimeter horizon, and then evaluating these in terms of wilting coefficients and field capacities. Peele and Beale's (1950) method was used for calculating approximate field capacities from the moisture equivalent : field .capacity = 2.62 + ( moisture equivalent X 0.865). Wilting coefficients were determined directly using mixtures of sunflower and wheat (Daubenmire 1959).…”

Section: Methodsmentioning

confidence: 99%

Soil Moisture in Relation to Vegetation Distribution in the Mountains of Northern Idaho

Daubenmire¹

1968

Ecology

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Soil drouth becomes intense in summer in the steppe (Festuca—Symphoricarpos) of the basal plain, decreasing progressively through Pinus ponderosa and Pseudotsuga menziesii forests on ascending the adjacent foothills. On mid—slopes where Abies grandis appears, and still higher in the mountains where Thuja plicata, Tsuga heterophylla, and Abies lasiocarpa occur, soil drouth appears to be of minor ecologic importance. In mesophytic forest areas early stages in secondary succession that are characterized by overly dense stands of slowgrowing individuals may develop intense soil drouth during this stagnation phase. On the upper parts of south—facing slopes, even high in the forested mountain, small parks with grassland climaxes containing Agropyron spicatum and Festuca idahoensis represent local areas of soil drouth comparable with that of steppe on the basal plain where the same grasses dominate. Climax vegetation types thus closely reflect soil moisture regimes, whereas altitude above sea level is very unreliable. Three grasses native to areas too dry for even the most xerophytic trees were found to germinate in autumn, develop slowly during the winter and so be sufficiently mature by early summer to endure several month of enforced aestivation. Trees, in contrast, do not germinate until spring and so are not far enough developed for their tap roots to descend more rapidly than the soil desiccates. Since they are incapable of enduring prolonged soil drouth they perish as the dry zone extends downward and overtakes their root tips.

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Section: Methodsmentioning

confidence: 99%

Soil Moisture in Relation to Vegetation Distribution in the Mountains of Northern Idaho

Daubenmire¹

1968

Ecology

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“…Attempts to predict field-capacity values of humid-region soils from Puerto Rico on a basis of clay percentages were successful, but failed when dealing with arid-and semiarid-region soils (3). Other investigators have presented data relating moisture equivalents to field capacities for South Carolina soils (5). Moisture equivalents can be obtained easily and accurately under controlled laboratory conditions.…”

Section: Methodsmentioning

confidence: 99%

Título en español.

López¹

1952

JAUPR

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The available water of soils is considered to be in the moisture range from field capacity to permanent wilting percentage. The customary procedures for determining these two soil constants are quite inconvenient. Although data are presented that show good agreement between moisture equivalents and field-capacity values in selected soils, it was not possible to obtain a reliable regression with soils from the arid and semiarid regions of Puerto Rico. The regression of permanent wilting percentages by the plant method to 15-atmosphere percentages is expressed by the equation, Y = 2.37 + 0.76 X, in which Y is the permanent wilting percentage and X is the 15- atmosphere percentage. Data on the available water capacity of the surface layer of sons from the arid and semiarid regions of Puerto Rico are presented. The range of available water is adequate in most soils, fluctuating from about 18 to 25, except in sands where it is lower. It is about the same in heavy soils such as clays and clay loams as in lighter ones such as sandy loam and sandy clay loams.

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“…The basic data obtained in this study were gravimetric determinations of the water content of soils collected by decimeter-depth horizons with a closed-tube type of sampler or a slender orchard-type auger. These data were then evaluated against wilting coefficients determined directly with mixed cultures of wheat and sunflowers grown in tumblers in a water bath, and field capacities estimated by adjustment of moisture-equivalent values (Peele and Beale 1950). METHODS Eight sites were selected that were approximately modal in their expression of the character of a major type of steppe vegetation.…”

Section: Introductionmentioning

confidence: 99%

Annual Cycles of Soil Moisture and Temperature as Related to Grass Development in the Steppe of Eastern Washington

Daubenmire¹

1972

Ecology

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The annual cycle of soil moisture use and recharge was followed in eight climax steppe communities by making gravimetric analyses to a depth of 1 m. Soil temperatures were measured at depths of 50 to 100 cm. The data were related to the phenologies of the dominant grasses. Differences in soil moisture and temperature seem to contribute more toward explaining the distributions of these steppe communities than do chemical content of the soils of their profile characters.

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Relation of Moisture Equivalent to Field Capacity and Moisture Retained at 15 Atmospheres Pressure to the Wilting Percentage¹

Cited by 5 publications

References 0 publications

Soil Moisture in Relation to Vegetation Distribution in the Mountains of Northern Idaho

Soil Moisture in Relation to Vegetation Distribution in the Mountains of Northern Idaho

Título en español.

Annual Cycles of Soil Moisture and Temperature as Related to Grass Development in the Steppe of Eastern Washington

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Relation of Moisture Equivalent to Field Capacity and Moisture Retained at 15 Atmospheres Pressure to the Wilting Percentage1

Cited by 5 publications

References 0 publications

Soil Moisture in Relation to Vegetation Distribution in the Mountains of Northern Idaho

Soil Moisture in Relation to Vegetation Distribution in the Mountains of Northern Idaho

Título en español.

Annual Cycles of Soil Moisture and Temperature as Related to Grass Development in the Steppe of Eastern Washington

Contact Info

Product

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About

Relation of Moisture Equivalent to Field Capacity and Moisture Retained at 15 Atmospheres Pressure to the Wilting Percentage¹