. Bulletin. Agriculture -- New Hampshire. PREHARVEST APPLE DROP surface. Furthermore, there is considerable variation in the thick- ness and distribution of the different soil zones located above the till layer. It was thought that these factors might cause differences in the size and distribution of the root system of different trees; also in the ability of different trees to obtain water and nutrients, which, in turn, might have an influence on the ability of the fruit to remain attached to the tree. For these reasons soil profile studies were made to determine the difference, if any, in the
. Bulletin. Agriculture -- New Hampshire. PREHARVEST APPLE DROP surface. Furthermore, there is considerable variation in the thick- ness and distribution of the different soil zones located above the till layer. It was thought that these factors might cause differences in the size and distribution of the root system of different trees; also in the ability of different trees to obtain water and nutrients, which, in turn, might have an influence on the ability of the fruit to remain attached to the tree. For these reasons soil profile studies were made to determine the difference, if any, in the number and size of roots, and of the root distribution of these trees in the different soil zones; also to observe any dift'erence in the distribution and extent of the several soil layers and the possible relation to root distribution and tree performance. In June, 1938. excavations 10 feet long and 2 feet wide were made at a distance of eight feet from the north side of the trunk of each tree. The depth of each excavation was determined by the underlying hard till layer, and digging was stopped after penetrating several inches into this layer. Because of the lack of uniformity in the depth. Fig. 1. Distribution of Roots and Profile Zones under tree No. 18 (upper) and tree No. 8 (lower). A, B, C, D, E indicate soil zones as described in the text. Relative size of roots is indicated by dots and circles. Small dots represent roots 2 mm. or less in diameter. Both charts represent light-dropping 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 perfectly resemble the original New Hampshire Agricultural Experiment Station. [Hanover, N. H. ] : New Hampshire Agricultural Experiment Station
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