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`Celebrity' tomatoes (Lycopersicon esculentum Mill.) were grown in peat-perlite under greenhouse conditions with five potassium (K) fertilization concentrations of 25, 50, 100, 200 and 300 (mg/liter) K in irrigation waters. Petiole sap K concentrations were monitored on a weekly basis with calorimetric paper test strips. Petiole sap K concentrations (ug/ml) were stable throughout crop development at each feed concentration. Total and marketable fruit yields increased linearly with increasing petiole sap K concentrations. However, the relationship between petiole sap K) concentrations and K levels in the irrigation waters was quadratic with a plataeu occuring at about 200 mg K/liter in the irrigation waters. Corresponding maximum sap K concentrations obtained were about 6200 ug K/ml. Yield responded quadratically to increasing K levels in the irrigation system, with maximum yields occuring at about 200 mg K/liter. Fruit yields appeared to decline as feed concentrations were increased beyond 200 mg K/liter. At optimum feed concentrations, maximum marketable yield of about 2.6 kg/plant were obtained on plants grown 21 weeks from seed.

YIELDS AND PETIOLE SAP POTASSIUM CONCENTRATIONS OF TOMATOES GROWN WITH FIVE POTASSIUM FERTIGATION LEVELS