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Interpretive Summaries:
2003 - Potassium Foliar Fertilization of Pistachio
2002 - Potassium Foliar Fertilization of Pistachio
2001 - Potassium Foliar Fertilization of Pistachio
Potassium Foliar Fertilization of Pistachio, 2001
The purpose of this study is to determine the benefits of foliar potassium (K) application alone or in combination with K applied in irrigation water for increasing pistachio nut yield and quality. It was initiated in 2001.
Foliar treatments consisting of 0 or 0.4 percent K solution were applied three times during the season (May 24, July 9, and August 9), and soil treatments totaling 120 lb K2O/A were also applied three times in irrigation water split in 30, 30 and 60 lb/A increments. There were no yield or quality differences observed this first year. However, tree-to-tree variation was large, and the alternate bearing nature of pistachios precludes drawing conclusions from only one year of observations. New harvesting technology will allow researchers to expand the experiment significantly in subsequent years and to increase analytical sensitivity.
Acreage of nut crops is rapidly increasing in California. This research will further refine management techniques to increase yield and quality with K fertilization reported in previous PPI/FAR-sponsored research. CA-22F
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