A few paragraphs from a four page report he did in 1898 about his research farm in Leavenworth Kansas. Paragraph one is about his establishment of the orchard. Paragraph two is of interest in elevation effects on apple fruit.
"In 1860 we set an orchard of a few hundred trees, consisting of about seventy varieties, two years old. Among them were Ben Davis, Winesap, York Imperial, Willow Twig, Rambo, Rawle’s Janet, White Pippin, and Jonathan, and the leading apples generally grown, including summer and fall varieties. At the same time we set out about 1000 root grafts in a nursery. We then collected over 1000 more [scions] and top-grafted them [into standard trees], to get the fruit sooner. Over 1000 of these were received from the late Charles Downing. From this collection, and from specimens of fruit received, we have been able to accurately describe over 2200 varieties, with an outline cut of each, with seeds and core and all other characteristics. And to ascertain what effect climate had upon each variety, we kept an accurate meteorological record of the weather. This we furnished to the Smithsonian Institution, Washington, D. C., for ten years. We also grew the leading varieties on an elevation 400 feet higher, and on various aspects not over two miles apart, and learned what effect elevation and aspect had upon the bearing quality of different varieties.
Early apples require a specific amount of heat to bring them to maturity from the time the fruit forms. If brought from a colder climate to a warmer one, you hasten its growth and accelerate its maturity just in proportion to the difference in mean temperature of the two localities, and consequently it ripens in the fall here. I prefer hilltop for quality, keeping, and color, and bottom for size. Hilltop and steep bluffs are the best for all kinds of winter apples, as they produce the richest fruit, with the finest color, and they keep the best and are not so subject to injurious pests. Fifty feet of abrupt elevation is equal in its effect to fifty miles of latitude south on frosty nights. It retards spring growth as much as forty miles north. An elevation of 400 feet makes a difference of from ten to twenty-five per cent. in the amount of saccharine matter in fruit, to which rich quality, fine flavor and aroma are due. Bottom land produces the largest apples, more murky in color and more irregular in bearing. Rolling, intermediate Kansas land will prove satisfactory. East and south slopes hasten the maturity of fruit, and are the best for early varieties; a northern slope retards the ripening of fruit and is the best for winter apples. The best specimens of apples we ever saw in Kansas grew on a northern bench about thirty feet below the top of an elevation of 400 feet, on good, rich, well-drained soil. They were large in size, clear in color, and perfect in form. We prefer any good soil that will produce a good corn crop, with a well-drained clay subsoil; mucky, wet or hard-pan soils are not fit for fruit. Land that produces a good crop of wheat is rich enough. We have seen a very heavy crop of York Imperial at its native home on quite thin freestone land. Almost any of the land in Leavenworth county is naturally rich enough if we only keep it so."
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If anyone wishes to view the 200 page compilations of various growers and professionals from late 1800’s Kansas, PM me and I can provide the link to the source.