Potassium (K) fertigation by microsprinkler significantly increased soil K content throughout the 0 to 30 inch soil profile in the three-year study. Available soil K was rapidly depleted where K was not applied, but increased for all K treatments. Yield and quality of pistachios were appreciably improved by K fertilization as reported in the previous issue of Better Crops with Plant Food, 1999, No. 3, pp. 10-12.
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