. The cereals in America. Grain. 204 THE CEREALS IN AMERICA. 276. Influence of Temperature.âIt is the temperature during the maize growing months of May to September inclusive, rather than the average annual temperature, that influences the production of maize. It is not only the temperature of air and soil as expressed by the thermometer, but also the sunshine, the influence of which is not fully expressed by thermometric read- ings. Brewer^ has shown that fifty-five per cent of the maize crop of 1879 in the United States was grown between July isotherms 75° and 80° F. and thirty- three per
. The cereals in America. Grain. 204 THE CEREALS IN AMERICA. 276. Influence of Temperature.âIt is the temperature during the maize growing months of May to September inclusive, rather than the average annual temperature, that influences the production of maize. It is not only the temperature of air and soil as expressed by the thermometer, but also the sunshine, the influence of which is not fully expressed by thermometric read- ings. Brewer^ has shown that fifty-five per cent of the maize crop of 1879 in the United States was grown between July isotherms 75° and 80° F. and thirty- three per cent be- tween 70° and 75° F., making a total of eighty-eight per cent between July Map showing area In Northern Hemisphere between July iso- ISOthcrmS 70° F. therms, 70° and 80° F., indicating suitable temperature for , o o â r' the production of maize. Note rainfall in chart (27 5). It is difficult to give precise limits to an influence which is one of several abso- lutely necessary. Beale^ has compared the yield of maize with the temperature in each of the nine leading maize producing States, viz., Ohio, Indiana, Kentucky, Tennessee, Illinois, Iowa, Missouri, Nebraska and Kansas, during the five months May to September inclusive for sixteen years. No relation in these favored States could be traced between yield per acre and temperature. Temperature is well known to influence maturity and may thus, indirectly at least, affect yield of merchantable grain, especially in regions near the northern limit of successful cul- ture. The New York State Station ® compares the soil temper- ature with yield in crops of different maturity, as follows: 1 Tenth Census U. S., Vol. Agr. 2 H. G. Beale: Thesis, B. S. Degree, Ohio State University, 1902. 3 N. Y. Rpt. (Geneva) 1886, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not pe
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