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Production Papers

Nitrogen Requirements for Flue-Cured Tobacco

^a Agricultural Research Council, Agronomical Research Institute, Modena Section, Viale Caduti in Guerra 134, I-41100 Modena, Italy
^b Agricultural Research Council, Institute for Tobacco Research, Bovolone Section, Via Canton 14, I-37051 Bovolone (Verona), Italy
^c Agricultural Research Council, Institute for Tobacco Research, Via Pasquale Vitiello 66, I-84018 Scafati (Salerno)

^* Corresponding author (rosa.marchetti{at}entecra.it)

Received for publication April 11, 2005. Fertilizer N excesses may have negative effects on both crop and water quality. To reduce the risk of N excesses it is essential to accurately define fertilizer N rates. The estimate of the most suitable N rate is complicated by the fact that a certain amount of the N taken up by the crop during the growth season is supplied by the soil. The aim of this work was to estimate the amount of N that can become available for plant uptake during the crop growth season. The effects of five N rates (0, 20, 40, 60, and 80 kg N ha^–1) on production traits of flue-cured tobacco (Nicotiana tabacum L.) cv. K326, and on selected items of an N balance applied to the soil–plant system were studied on a loam soil, in 1998 and 1999, at Bovolone (Verona, northern Italy). The fertilizer N rate positively and significantly influenced cured-leaf yields only in 1999, whereas the time to harvest increased linearly for increasing N rates, in both years (0.25 d on average for every further kg of fertilizer N). The N balance indicated a remarkable reduction of the soil organic N stock and an increase of the soil inorganic N levels throughout the crop growth period. As these changes were both proportional to the fertilizer N rate, the occurrence of a positive priming effect was hypothesized. The formulation of N fertilizer recommendations to farmers should take into account the existence of priming effect phenomena.

Abbreviations: AGN, plant aboveground N removal • AGN_max, plant maximum aboveground N removal • DAT, days after tobacco transplanting • DAT_max, days to reach AGN_max • DM, dry matter • DTH, days to harvest • N_fert, fertilizer N input • N_inorg, change in soil inorganic N storage • N_org, change in soil organic N storage