Walnut orchards on volcanic soils deficient in phosphorus

Serr, E

Walnut orchards on volcanic soils deficient in phosphorus

Author

E. F. Serr

Author Affiliations

E. F. Serr is Pomologist, University of California, Davis.

Publication Information

Hilgardia 14(6):6-7. DOI:10.3733/ca.v014n06p6. June 1960.

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Abstract

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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