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  • Geography  (4)
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  • Geography  (4)
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  • 1
    Online Resource
    Online Resource
    Soil Temperature and the Early Growth of Corn from Mulched and Unmulched Soil
    Wiley ; 1959
    In:  Soil Science Society of America Journal Vol. 23, No. 6 ( 1959-11), p. 428-434
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 23, No. 6 ( 1959-11), p. 428-434
    Abstract: On corn plots in Iowa, South Carolina, Ohio and Minnesota which were treated with oat straw either plowed under or on the surface and with two levels of N, measurements were made of soil temperature at the 4‐inch depth, and these measurements were correlated with dry matter yields of corn early in the season. The data from Iowa, Minnesota and Ohio support a theory that early season corn growth is decreased by low temperatures caused by a mulch of crop residues. The data from South Carolina, where soil temperatures were considerably higher than in the three other states, showed that the mulch did not appreciably influence the growth rates. The data from all four of the states agreed in a general way with data of Lehenbauer who found that for a range of temperatures from about 50° to 86° F. there is an increase with temperature of seedling growth rate; whereas around 86° to 90° F. there is little influence; and from about 90° to 111° F. there is a decrease. From the soil temperature measurements taken at a 4‐inch depth it was shown how temperatures for other depths could be deduced from a theoretical expression based on heat flow theory. A detailed example of the use of the heat flow theory in studying the mulch problem in practical experimentation is presented.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1959.03615995002300060020x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1959
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Diffusion Equation Calculations of Field Soil Water Infiltration Profiles
    Wiley ; 1961
    In:  Soil Science Society of America Journal Vol. 25, No. 3 ( 1961-05), p. 165-168
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 25, No. 3 ( 1961-05), p. 165-168
    Abstract: Theoretical moisture profiles calculated from a numerical analysis of the equation urn:x-wiley:03615995:saj2sssaj196103615995002500030008x:equation:saj2sssaj196103615995002500030008x-math-0001 were compared with experimental profiles for two field soils. Both soils were loess‐derived and were of silt loam texture throughout their profiles. After previously being wet to their field capacities, the soil surfaces were kept at saturation for a definite time interval. The distribution of soil water throughout the profiles immediately following this time interval was measured by neutron scattering. Soil cores were removed from the plots at 15.2‐cm. depth intervals. Using these cores, moisture release curves and capillary conductivity values were determined for those soil moisture contents which occurred in the field. The numerical solution used for the above equation requires a homogeneous soil. The calculated soil moisture profiles were based upon the physical measurements made on the surface 30 cm. of soil only. Discrepancies between measured and calculated profiles are explained on basis of variation of the physical properties of the entire profile from those of the first 30 cm., and on basis of plot size.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1961.03615995002500030008x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1961
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Measuring Water Stored Temporarily Above the Field Moisture Capacity
    Wiley ; 1959
    In:  Soil Science Society of America Journal Vol. 23, No. 6 ( 1959-11), p. 408-412
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 23, No. 6 ( 1959-11), p. 408-412
    Abstract: Using a neutron type soil moisture meter, amounts of water temporarily stored in soil profiles above the field moisture capacity were observed for two silt loam and two clay loam soils. The amounts of temporarily stored water for the 5‐foot depth, ranged from 4.7 inches for one of the silt loams to 2.1 inches for one of the clay loams, immediately after 6 inches of irrigation water had penetrated into the soil. After 90 hours, temporarily stored water could still be detected ranging from 1.5 inches to 0.3 inches. The soils had previously been wetted to the field moisture capacity. Evaporation was prevented by a polyethylene cover. The field measurements, and some laboratory physical measurements which were made on core samples, indicated that one of the silt loams and two of the clay loams would probably have aeration problems due to the stored water. One of the silt loams had adequate aeration for all depths and times studied regardless of the addition of extra water. The laboratory physical measurements provided an explanation for the storage behavior found in the field. The relations between depth, soil moisture suction and soil moisture percentage were plotted as a three‐dimensional diagram which enables a clear general view of the behavior of the soil water.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1959.03615995002300060016x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1959
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Determination of Thermal Conductivity and Volumetric Heat Capacity of Soils Near the Surface
    Wiley ; 1964
    In:  Soil Science Society of America Journal Vol. 28, No. 4 ( 1964-07), p. 461-464
    Details
    In: Soil Science Society of America Journal, Wiley, Vol. 28, No. 4 ( 1964-07), p. 461-464
    Abstract: Thermal conductivity and volumetric heat capacity of a soil near its surface are in situ simultaneously determined using a heat flux plate on the soil surface and thermocouples in the soil. The rise of the temperature caused by a heat pulse of short duration is recorded. The time involved in numerical calculations is greatly reduced by the use of Laplace transforms of heat flux density and rise of temperature. The heat flux into the soil under natural conditions can be calculated from the temperature recorded in the absence of the heat flux plate using the thermal conductivity as it has been determined. The method is applied to a sand soil and to a peat mulch on sand, which were at uniform initial temperature. Theory is emphasized. A discussion of some experimental problems, met in in situ determinations, will be given in a subsequent paper.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    URL: Article
    DOI: 10.2136/sssaj1964.03615995002800040005x
    RVK:
    RA 4845
    Language: English
    Publisher: Wiley
    Publication Date: 1964
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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