Walnut orchards on volcanic soils deficient in phosphorus
AuthorE. F. Serr
Author AffiliationsE. F. Serr is Pomologist, University of California, Davis.
Hilgardia 14(6):6-7. DOI:10.3733/ca.v014n06p6. June 1960.
During a period of abnormally high temperatures in 1954, severe leaf burning occurred in hillside plantings of walnuts in Lake County. Browning and drying of irregular areas in the walnut leaflets were followed by progressive dropping of entire leaflets, starting with the basal pair. The leaf analyses suggested phosphorus deficiency.
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