Effect of Claypan on the Growth and Production of Apples in California1
- R. Earl Storie2
Soils of uniform texture to a considerable depth produce large long-lived apple trees that are deep rooted. Mature trees in Santa Cruz County, California, produce annually between 700 and 2,400 40-pound boxes of apples per acre. The average of 34 records between 1931 and 1937 is 1,088 boxes per acre.
Soils that have moderately subsoils or soils of immature to seminature age produce considerably smaller trees that are not so long lived or deep rooted as those produced on recent or young soils. The average annual production of apples on these soils in Santa Cruz County is 379 boxes per acre.
Soils having very dense clay subsoils produce small stunted trees that are not long lived and are quite shallow rooted. Apple production under these conditions varies between twenty and 215 boxes per acre.
Coastal plain soils having dense clay subsoils are quite erosive and therefore often have shallow surface soils. Apples growing under such conditions do so with considerable difficulty.
The apple production curve parallels the soil rating curve as previously set up by means of the Storie Index.
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