Leaf analyses of differentially covercropped deciduous fruit trees
AuthorsE. L. Proebsting
J. G. Brown
Authors AffiliationsE. L. Proebsting was Professor of Pomology and Pomologist in the Experiment Station, Davis; J. G. Brown was Associate Specialist, Experiment Station, Department of Pomology, Davis.
Hilgardia 23(5):125-153. DOI:10.3733/hilg.v23n05p125. November 1954.
An examination of 1,470 graphs of seasonal changes in content of N, K, P, Ca, and Mg in leaves of four species of fruit trees over a three-year period produced certain conclusions: 1) nitrogen is high in the spring and decreases thereafter; 2) variations in potassium content are greater than in nitrogen; 3) phosphorous curves tend to follow the general shape of nitrogen curves for all fruits except the apricot; 4) calcium and magnesium contents are less affected by treatment, season, or species than the other elements; and 5) the differences shown here for unfertilized trees illustrate some of the factors to be considered in the use of leaf analyses as tools for diagnosing nutritional status.
Goodall D. W., Gregory F. G. Chemical composition of plants as an index of their nutritional status. Imperial Bur. of Hort. and Plantation Crops [East Mailing, Kent] Tech. Com. No. 1947. 17:
Lilleland O. Experiments with K and P deficiencies with fruit trees in the field. Amer. Soc. Hort. Sci. Proc. 1932. 29:272-76.
McCollam M. E. The leaf analysis approach to crop nutrition. Better Crops with Plant Food. 1952. 36(10):6-14. 43-44
Proebsting E. L. Changes in the nitrate and sulfate content of the soil solution under orchard conditions. Hilgardia. 1929. 4(2):57-76. DOI: 10.3733/hilg.v04n02p057 [CrossRef]
Proebsting E. L. Concentration of certain constituents of the soil solution under orchard conditions. Hilgardia. 1930. 5(3):35-59. DOI: 10.3733/hilg.v05n03p035 [CrossRef]
Proebsting E. L. Effect of covercrops on the soil solution at different depths under orchard conditions. Hilgardia. 1933. 7(14):553-84. DOI: 10.3733/hilg.v07n14p553 [CrossRef]
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