ISHS Acta Horticulturae 591: III International Symposium on Pistachios and Almonds
SEASONAL CHANGES OF MINERAL NUTRIENTS IN LEAVES OF TWO IRANIAN ALMOND CULTIVARS |
| Authors: | V. Roohi, J. Mohammadi |
| Keywords: | Prunus dulcis, leaf analysis, nitrogen, phosphorus, potassium |
| Abstract:
Seasonal changes of three major mineral nutrients: nitrogen, posphorus and potassium, were studied in leaves of two Iranian almond cultivars (‘Sefid’ and ‘Mamaei’). The research was conducted in the Saman area, situated in the Chahar Mahahl va Bakhtiari province, in the central part of Iran, during 1998-1999. A C.R.D experimental design with three replications was used. Leaves were sampled randomly in selected trees at six stages: 45, 70, 95, 120, 145, and 170 days after full bloom. Results indicate that, on a leaf dry-weight basis, leaf nitrogen concentration was very high early in the season and then declined rapidly and reached a steady state value 120 days after full bloom. The same general trend was observed for leaf phosphorus concentration, which showed more fluctuations than that of nitrogen. The concentration of potassium also started high and was almost unchanged during the year. Few changes in nitrogen, posphorus and potassium concentrations occurred from stages 4, 3 and 2 onward, respectively. | |
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