A First Report on the Relations Between Climates and Crops
Summary of expert opinion published up to 1891, on seed germination; soil temperature and moisture; solar energy; atmospheric conditions; and influences of climate; with data for selected U.S. and foreign locations.
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It is not warmed or cooled appreciably by conduction of atmospheric heat , but by
direct absorption or loss of the radiation that falls upon it . To a slight extent (
perhaps 5 per cent ) this sunshine is reflected from the surface particles of the ...
to the ground is comparatively slight , owing to the slow conductivity of the soil
and the small specific heat of the atmosphere . This point has been carefully
developed by Maurer , of Zurich ( 1885 ) . But when rain and snow fall , then the
The constant fractional part of the annual sum total of heat , as previously
established by Linsser , afforded him a valuable suggestion or a working
hypothesis as to the relation between the life of the plant and other factors , such
as sunshine ...
Of course , we can not speak of absolute quantities of heat or nourishing material
. We have to do only with their relative distribution during the period of vegetation
— that it to say , with the ratio of the quantity of material ( f ) to the quantity of ...
... since in such dry regions the quantity of heat required to produce a given
phase ceases to be a simple constant and becomes a complex function of the
available heat and moisture and depends upon the individual ratio f / w at each
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