ISHS Acta Horticulturae 274: International Symposium on Diagnosis of Nutritional Status of Deciduous Fruit Orchards
SEASONAL CHANGES OF N,P,K,CA AND MG CONTENT IN APPLE TREE LEAVES DURING VEGETATION PERIOD |
| Authors: | J. Nurzynski, A. Komosa, M. Wesolowska-Janczarek, M. Kepka, G. Kozera |
| Abstract:
In the years 1986–1988 level of N,P,K,Ca and Mg was determined in apple leaves sampled in 40 orchards each year. Every year samples were taken at 7 different dates, starting from July 5 till September 5. The significant differences occurred between the contents of all nutrients in apple tree leaves for each orchard, date and year and only potassium showed another process of changes for each year. On the average the highest N,Ca and Mg content was noted in 1986 and the lowest in 1987, 1988 having been intermediate. K and P leaf content was the highest in 1988, K content was the lowest in 1986 while in P content no difference was found between 1986 and 1987. | |
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