Votes and proceedings of the General Assembly of the state of New-Jersey . lated disasters are more likely. Location of Agricultural Production The worlds land area totals about 33 billion acres. Of this, bil-lion acres (24 percent) are theoretically arable--capable of producing less than half of this land, billion acres, has soil and cli-mate suitable for the production of crops or livestock with todays tech-nology and price relationships. The western world has 45 percent of thepotentially arable land and less than 20 percent of the worlds trends in po
Votes and proceedings of the General Assembly of the state of New-Jersey . lated disasters are more likely. Location of Agricultural Production The worlds land area totals about 33 billion acres. Of this, bil-lion acres (24 percent) are theoretically arable--capable of producing less than half of this land, billion acres, has soil and cli-mate suitable for the production of crops or livestock with todays tech-nology and price relationships. The western world has 45 percent of thepotentially arable land and less than 20 percent of the worlds trends in population growth will only increase this disparity. Thermal and moisture conditions are the principal factors in determingthe location of crop production. Most of the worlds grain production issituated between the 30th and 55th parallels of the northern and southernhemispheres (see Figure 1), where the summer temperatures average 70degrees to 75 degrees. These belts are limited in the lower latitudesby high summer temperatures and in higher latitudes by the length of the. CRS-13 growing season. In Canada and the the northern margin ofsignificant agricultural settlement corresponds to the 120-130 degree monthline, and the northern limit of corn for grain is the 200 degree monthline. 2/ The lower limit of precipitation for non-irrigated agriculture isaround l0-ll per year, and the distribution of moisture over the grow-ing season has a major influence on yields. The major wheat producing areas are the grasslands of North America,South America, eastern Europe, Asia and Australia. Corn is grown in thewetter and warmer portions of these same regions. The important riceareas of India, southeast China and other countries of southeast Asia arelargely confined to tropical (free from freezing temperatures) and subtropi-cal monsoon climates. All of these climates have transitional zones ortension zones around them. Climatic fluctuations can strongly affectagricultural productivity
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