Carleton observed that the same
varieties of wheat grown at Nephi, Utah, contained 16.61 per cent
protein; at Amarillo, Texas, 15.25 per cent; and at McPherson,
Kansas, a humid station, 13.04 per cent. This variation is
undoubtedly due in part to the varying annual precipitation but,
also, and in large part, to the varying general climatic conditions
at the three stations.
An extremely interesting and important experiment, showing the
effect of locality upon the composition of wheat kernels, is
reported by LeClerc and Leavitt. Wheat grown in 1905 in Kansas was
planted in 1906 in Kansas, California, and Texas In 1907 samples of
the seeds grown at these three points were planted side by side at
each of the three states All the crops from the three localities
were analyzed separately each year.
The results are striking and convincing. The original seed grown in
Kansas in 1905 contained 16.22 per cent of protein. The 1906 crop
grown from this seed in Kansas contained 19.13 per cent protein; in
California, 10.38 percent; and in Texas, 12.18 percent. In 1907 the
crop harvested in Kansas from the 1906 seed from these widely
separated places and of very different composition contained
uniformly somewhat more than 22 per cent of protein; harvested in
California, somewhat more than 11 per cent; and harvested in Texas,
about 18 per cent.
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