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`Celebrity' tomatoes ( Lycopersicon esculentum  Mill.) were grown in peat–perlite under greenhouse conditions in two experiments with five levels of K (25, 50, 100, 200, and 300 mg·liter –1 ) in irrigation waters. In both experiments, aqueous petiole sap K concentrations (milligrams K per milliliter) were monitored weekly with colorimetric paper test strips. Variation in petiole sap K concentrations among plants was low among three-plant replicates ( cvs  of 9% to 11%). Petiole sap K concentrations varied considerably from week to week, but remained relatively constant over time at levels determined by external-feed K concentrations. Petiole sap K levels and marketable-fruit yield increased quadratically with increasing external K concentrations. Maximum yields were produced with 190 to 200 mg K/liter in external-feed solutions. Maximum marketable yields of ≈2.75 kg/plant occurred with =5.9 mg K/ml in petiole sap. Quick petiole sap K tests appear to be suitable for assessing the K status of greenhouse tomatoes.

Monitoring the Potassium Status of Greenhouse Tomatoes Using Quick Petiole Sap Tests