Abstract
Trials were conducted with tomatoes over 2 years to evaluate nitrate sap testing and determine desirable sap nitrate values. In addition, desirable values for acetic acid extractable nitrate-N (HOAc-NO 3-N) and total N were determined. There were strong linear correlations between applied N and sap nitrate-N, HOAc-NO 3-N, and to a lesser extent with total N. The desirable sap nitrate value at 6 weeks from transplanting was 880–1180 mg 1 −1 in the first year and 980–1120 mg l −1 in the second year. The sap nitrate desirable values were generally lower later in the crop growth. The desirable values found in this study for HOAc-NO 3-N and total N were in good agreement with other published data.
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