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  • 1940-1944  (5)
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  • 1940-1944  (5)
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  • 1
    Online Resource
    Online Resource
    Studies in soil cultivation: XI. The effect of inter-tillage on the sugar-beet crop
    Cambridge University Press (CUP) ; 1942
    In:  The Journal of Agricultural Science Vol. 32, No. 3 ( 1942-07), p. 330-337
    Details
    In: The Journal of Agricultural Science, Cambridge University Press (CUP), Vol. 32, No. 3 ( 1942-07), p. 330-337
    Abstract: Experiments on the effect of inter-row cultivation of sugar beet, carried out in the three years 1939–41 on a sandy loam, led to the following results: 1. If the soil nutrients are in short supply hoeing or hand-weeding increases the yield of the beet, provided these operations are carried out before or shortly after singling. 2. Hoeing is more effective than hand-weeding, but it cannot yet be said with certainty whether this is due entirely to more efficient weed destruction, or whether there is some additional effect, such as mulching. 3. If adequate quantities of soil nutrients are present, inter-row cultivation has little effect on yield, and the crop can tolerate a considerable weed infestation without any effect on yield. The results for sugar beet on the heavy clay-with-flints soil at Rothamsted show: 1. Additional hoeings after singling, above a modest minimum, have either no effect on yield or else depress it. 2. On the one occasion when pre-singling cultivations were given, the yield was increased. 3. In contrast with the Woburn results the effect of cultivation does not vary with, the level of manuring.
    Type of Medium: Online Resource
    ISSN: 0021-8596 , 1469-5146
    URL: Article
    DOI: 10.1017/S0021859600048115
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1942
    detail.hit.zdb_id: 1498349-7
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    Online Resource
  • 2
    Online Resource
    Online Resource
    The efficiency of pneumatic tyred tractors under farm conditions
    Cambridge University Press (CUP) ; 1942
    In:  The Journal of Agricultural Science Vol. 32, No. 1 ( 1942-01), p. 1-42
    Details
    In: The Journal of Agricultural Science, Cambridge University Press (CUP), Vol. 32, No. 1 ( 1942-01), p. 1-42
    Abstract: 1. Increasing the ballast on pneumatic tyres, up to a certain weight, improves the tractor performance as judged by its speed, fuel consumption and wheel slip. Further increases beyond this point continued to decrease the wheel slip without having any marked effect on its speed or fuel consumption. No certain evidence was obtained that too heavy a ballast decreased the tractor's efficiency. 2. The tyre load affects the maximum pull the tractor can exert while working reasonably efficiently, but this pull does not depend markedly on the speed of work. Wheel weights of about 12–13 cwt. seem to be the minimum required for optimum performance of the 36 or 28 in. tyres at pulls of 1800 lb. under fairly good ground conditions, and possibly a greater weight may be required by the 24 in. tyre. 3. If the tractor is ploughing it is usually running tilted, and this tilt transfers sufficient weight on to the furrow wheel for it to work efficiently under most conditions. Additional ballast is, however, often necessary for the lighter land-side wheel. 4. Tyre performance is much less dependent on inflation pressure than on ballast. Pressures below 10 lb./sq. in. were only of use in wet conditions when small amounts of additional ballast were not available. Pressures above 12 lb./sq. in. may allow excessive slip to take place and probably only need be used on the furrow wheel of a well-loaded tractor ploughing.
    Type of Medium: Online Resource
    ISSN: 0021-8596 , 1469-5146
    URL: Article
    DOI: 10.1017/S0021859600047523
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1942
    detail.hit.zdb_id: 1498349-7
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  • 3
    Online Resource
    Online Resource
    Daily and seasonal changes in the surface temperature of fallow soil at rothamsted
    Wiley ; 1943
    In:  Quarterly Journal of the Royal Meteorological Society Vol. 69, No. 298 ( 1943-01), p. 1-13
    Details
    In: Quarterly Journal of the Royal Meteorological Society, Wiley, Vol. 69, No. 298 ( 1943-01), p. 1-13
    Abstract: A method of obtaining continuous records are discussed. The relations between surface and sub‐surface temperatures are briefly considered, and then, in more detail, the inter‐dependence of soil surface and air temperatures is examined. At all seasons the soil temperature is in phase with solar radiation whereas the maximum air temperature is delayed; for air maxima below 52° F. the daily range of soil surface temperature is approximately the same as that of the air temperature. Above this threshold the soil surface maximum increases twice as rapidly as the air maximum. Using this value of the air maximum, 5244F., to divide the year into two seasons, it is found that the winter and summer periods so separated are the same as those previously obtained form the criterion:—Seasonal evaporation is equal to or less than that from an open water surface. Interest is primarily centred on the summer season, in which the soil surface temperature exceeds that of the air for a considerable part of the day, and for a rainless summer period of t days an anticipated relation of the form ΣE=at1/n, where n=3, a is a constant and ΣE=the total evaporation, is confirmed from the Rothamsted records. The effect of the diurnal oscillation of surface temperature on germinating seed is briefly discussed.
    Type of Medium: Online Resource
    ISSN: 0035-9009 , 1477-870X
    URL: Issue
    URL: Article
    DOI: 10.1002/qj.v69:298
    DOI: 10.1002/qj.49706929802
    RVK:
    UA 1000
    RVK:
    UA 7650
    Language: English
    Publisher: Wiley
    Publication Date: 1943
    detail.hit.zdb_id: 3142-2
    detail.hit.zdb_id: 2089168-4
    SSG: 14
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Use of Alternating Current Solenoid in Freeze Tests
    American Chemical Society (ACS) ; 1944
    In:  Industrial & Engineering Chemistry Analytical Edition Vol. 16, No. 9 ( 1944-09-01), p. 588-590
    Details
    In: Industrial & Engineering Chemistry Analytical Edition, American Chemical Society (ACS), Vol. 16, No. 9 ( 1944-09-01), p. 588-590
    Type of Medium: Online Resource
    ISSN: 0096-4484 , 1541-4655
    URL: Article
    DOI: 10.1021/i560133a021
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 1944
    detail.hit.zdb_id: 1483443-1
    detail.hit.zdb_id: 1508-8
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  • 5
    Online Resource
    Online Resource
    Meteorological and soil factors affecting evaporation from fallow soil
    Wiley ; 1940
    In:  Quarterly Journal of the Royal Meteorological Society Vol. 66, No. 287 ( 1940-10), p. 401-410
    Details
    In: Quarterly Journal of the Royal Meteorological Society, Wiley, Vol. 66, No. 287 ( 1940-10), p. 401-410
    Abstract: Using the conception of natural periods, for which the difference between rainfall and drainage can be equated to the evaporation, the mean daily rates of evaporation from a block of fallow soil at Rothamsted are examined for 94 periods varying in length from 13 to 45 days. In seeking correlations with single daily meteorological observations two types of treatment are employed. (1) The year is considered in three seasons of four months each—summer, winter and two equinoctial pairs of months—and it is shown that an almost complete description of evaporation can be obtained in terms of rainfall only, the nature of the correlation varying from season to season. (2) A general treatment is attempted in physical terms, considering evaporation as due to diffusion across a non‐turbulent boundary layer whose thickness is determined by wind velocity, the soil surface being assumed to be continuously at 100 per cent R.H. The general agreement between observed and predicted values is very good in winter. The summer data are shown to lie between the theoretical limits imposed by the assumptions of (i) continuous 100 per cent R.H. at the surface, and (ii) a steady retreat of the 100 per cent R.H. layer into the soil, i.e., no upward movement of liquid during the evaporation process. The considerable scatter in the data is attributed partly to the inadequacy of single daily meteorological observations but chiefly to the lack of knowledge of the conditions existing at the soil surface.
    Type of Medium: Online Resource
    ISSN: 0035-9009 , 1477-870X
    URL: Issue
    URL: Article
    DOI: 10.1002/qj.v66:287
    DOI: 10.1002/qj.49706628706
    RVK:
    UA 1000
    RVK:
    UA 7650
    Language: English
    Publisher: Wiley
    Publication Date: 1940
    detail.hit.zdb_id: 3142-2
    detail.hit.zdb_id: 2089168-4
    SSG: 14
    Location Call Number Limitation Availability
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    Online Resource
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