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Assessment on how current standard tomato production impacts plant and soil C and N dynamics is necessary to improve sustainable nutrient management strategies for the intensive production of vegetables in warm climates. Carbon (C), nitrogen (N) and C:N ratios were determined for tomato variety ‘BHN 602’ ( Solanum lycopersicum ) in spring and fall season at harvest, in north Florida. A replicated field study was conducted where tomatoes were grown in sandy soils with fertilizers injected through the drip irrigation lines under a plastic-mulched bed system. Ammonium nitrate as the N source was applied at four different rates (0, 168, 224, and 280 kg ha −1 ). Soluble N fertilizer was applied weekly in 13 equal doses through the drip system for both seasons. Whole plant C:N ratios were similar among N rates in both spring and fall applications showing that the lowest applied N rate (168 kg ha −1 ) was sufficient in supplying N to the crop. Therefore, fertilized whole plant C:N ratios of 15.2 (spring) and 13.8 (fall) indicated optimal N uptake capability by the tomato crop. Soil TC and TN concentrations were maintained in the top 0-45 cm increments of the soil profile in both seasons, where concentrations did not differ among the rates of N fertilizer applied. Due to the lack of fertilizer input response, the reduction of N fertilizer rates would improve the sustainability of conventional vegetable production systems that are grown in sandy soil under a warm climate. Soil C was commensurate with soil N levels with regard to stabilizing the C:N ratio below 20, thus promoting mineralization in the soil for the subsequent crop.

Current tomato production practices and their effects on plant and soil carbon and nitrogen dynamics