A First Report on the Relations Between Climates and CropsSummary 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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Page 7
... grown , and thus insure a maximum crop ; or , on the other hand , by successive culti- vations , under successive slight changes in the artificial climate , may so modify the seed as to produce a new variety with a fixed habit of growth ...
... grown , and thus insure a maximum crop ; or , on the other hand , by successive culti- vations , under successive slight changes in the artificial climate , may so modify the seed as to produce a new variety with a fixed habit of growth ...
Page 8
... growing within the influence of a forest have a somewhat different climate from those growing in the open field . The amount of this influence will become a proper study when any important crop is cultivated within a forest or under its ...
... growing within the influence of a forest have a somewhat different climate from those growing in the open field . The amount of this influence will become a proper study when any important crop is cultivated within a forest or under its ...
Page 16
... grow - can not make headway against them . In extreme cases , such as frosts , sudden thaws , and great droughts , the climate may even destroy the organic material that had already been formed in the plant . No plant life , not even ...
... grow - can not make headway against them . In extreme cases , such as frosts , sudden thaws , and great droughts , the climate may even destroy the organic material that had already been formed in the plant . No plant life , not even ...
Page 18
... grown plant , it is commonly said to absorb carbonic- acid gas from the air through its leaves and to exhale oxygen . The investigations of Moisson tend to modify this statement and show that at low temperatures there is more oxygen ...
... grown plant , it is commonly said to absorb carbonic- acid gas from the air through its leaves and to exhale oxygen . The investigations of Moisson tend to modify this statement and show that at low temperatures there is more oxygen ...
Page 24
... growing plants in too contracted a space , either in tubes or bell glasses . This last objection is apparent when it is wished to ascertain the influence of the gases diffused in the atmosphere around plants , or that of the plants ...
... growing plants in too contracted a space , either in tubes or bell glasses . This last objection is apparent when it is wished to ascertain the influence of the gases diffused in the atmosphere around plants , or that of the plants ...
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Common terms and phrases
acid actinometric degrees agricultural altitude ammonia annual atmosphere August average barley blossoming bushels carbonic acid cent cereals chemical chlorophyll climate Collomia Crataegus crop cultivation date of flowering date of sowing December epoch evaporation experiments favorable fertilizers following table frost germination given gives grain grams growth harvest heat Hervé Mangon inches increase influence intensity July July 18 July 23 June June 16 June 22 kilograms latitude leaf Leguminosa light Linsser maize Marié-Davy maximum mean daily temperatures mean temperature meteorological meters method moisture Montsouris nitrates nitrogen observations October oxygen perature plants plats quantity radiation rain rainfall Réaum ripening roots season seed Sept September September 29 Sesamum shows soil solar sown species stant stations sum total sunlight sunshine surface tempera temperature Thermal constants thermometer tion ture varieties vegetation wind winter wheat
Popular passages
Page 369 - On the Relative Intensity of the Heat and Light of the Sun upon Different Latitudes of the Earth.
Page 311 - The visitations most marked and best defined, occur at intervals of about sixty-five years, reckoning from the middle of one period to the middle of the next period, and last from twenty to twenty-two years, making the interval from the end of one to the beginning of the next about forty-five years. 6.
Page 27 - ... and below, a red spot instead of purplish-red. With the blue glasses, which allowed some green and yellow to pass, that which was red or yellow in the leaf had spread, so that there only remained a green border or edge. Under the nearly pure violet glasses the foliage became almost uniformly green. Thus, by means of colored glasses, provided they are not yellow, horticulturists may hope to obtain at least temporary effects as to the coloring of variegated foliage. The action of electricity on...
Page 27 - ... exact degree of its action by day and by night. An atmosphere of carbonic acid gas might also be created, such as is supposed to have existed in the coal period. Then it might be seen to what extent our present vegetation would take an excess of carbon from the air, and if its general existence was inconvenienced by it. Then it might be ascertained what tribes of plants could bear this condition, and what other families could not have existed, supposing that the air had formerly had a very strong...
Page 82 - X 0.8758 where the exponent e represents the thickness of the layer of air through which the sun's rays must pass...
Page 316 - The ideal climate for wheat is one with a long and rather wet winter, with little or no frost, prolonged into a cool and rather wet spring, which gradually fades into a warmer summer, the weather growing...
Page 304 - C, obtained some of these seeds from Georgia and planted them. This crop failed to mature, and the first successful crop of long staple cotton grown in South Carolina was planted in 1790, by William Elliott, on the northwest corner of Hilton Head, on the exact spot where Jean Ribault landed the first colonists and erected a column of stone, claiming the territory for France, a century before the English settled on the coast. Mr. Elliott's crop sold for \oY2A.
Page 303 - Bahamas, and Signer Filippo Partatori (Florence, 1866) saying it came from Cat Island, one of the Barbadoes. "But as Anguilla is one of the Barbadoes, and Cat Island one of the Bahamas, it would seem difficult to decide to which group of islands we are indebted for these seed.
Page 306 - Island, Colleton County, SC, obtained some of these seeds from Georgia and planted them. This crop failed to mature, and the first successful crop of long staple cotton grown in South Carolina was planted in 1790, by William Elliott, on the northwest corner of Hilton. Head, on the exact spot where Jean Ribault landed the first colonists and erected a column of stone, claiming the territory for France, a century before the English settled on the...
Page 26 - Accordiag to the experiments we have on this subject, they would appear to have but little power over any of the functions ; but it would be worth while to investigate further the calorific regions of the spectrum by employing Dr. Tyndall's process, that is, by means of iodine dissolved in bisulphide of carbon, which permits no trace of visible light to pass. How interesting it would be to make all these laboratory experiments on a large scale ! Instead of looking into small cases, or into a small...