ISHS Acta Horticulturae 470: II International Symposium on Pistachios and Almonds
THE EFFECTS OF ALTERNATE BEARING, SOIL MOISTURE AND GYPSUM ON POTASSIUM NUTRITION OF PISTACHIO (PISTACIA VERA L.) |
| Authors: | David Q. Zeng, P. H. Brown, R. C. Rosecrance |
| Keywords: | Pistachio (Pistacia vera L.), Potassium, Crop load, Soil moisture, Gypsum |
| Abstract:
A review of potassium (K) nutrition in pistachio (Pistacia vera L.) is given and research perspectives in this area are discussed. Very limited information is available about K nutrition in pistachio. Recent studies indicate that K uptake and distribution in pistachio trees are driven by the development of the fruit, with the crop serving as a sink for K. K uptake occurs mainly during the nut fill period, with little K uptake during the spring vegetative flush and postharvest periods. K fertilization is found to be effective in increasing leaf K status, nut yield and quality in pistachio. However, no guidelines for K fertilization exist and no generally accepted yield-based K diagnostic criteria have been developed. Further studies on K nutrition should be conducted in association with problems encountered in pistachio production, such as soil moisture regimes and nutrient interactions, in order to optimize the K fertilizer program. | |
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