Abstract

GILETTO, Claudia Marcela; RATTIN, Jorge Edgardo; ECHEVERRIA, Hernán Eduardo  and  CALDIZ, Daniel Osmar. Nitrogen use efficiency in potato processing varieties grown in the southeast of Buenos Aires province. Cienc. suelo [online]. 2007, vol.25, n.1, pp.43-51. ISSN 1850-2067.

The purpose of this work was to determine nitrogen utilization efficiency (NUE), nitrogen physiological efficiency (NPE) and nitrogen agronomic efficiency (NAE) in contrasting potato varieties Innovator, Russet Burbank, Bannock Russet and Gem Russet with different nitrogen availability (235, 311, 383 and 407 kg N ha^-1). Innovator and Russet Burbank showed greater NAE (175,1 and 175,5 kg of tuber kg N^-1) and their response to applied N was higher than in other cultivars. Innovator required more nitrogen than Russet Burbank, while. Bannock Russet and Gem Russet showed a lower NAE (147,5 and 135,6 kg of tuber kg N^-1) and they did not respond to the applied nitrogen to produce tuber. Bannock Russet showed a lower NAE as a consequence of it low NUE but Gem Russet presented a low  NAE as a consequence of it low  NPE. However, both cultivars showed a higher processing quality than Russet Burbank. Then, due to this reason Russet Burbank is being replaced by this cultivars.

Keywords : Nitrogen; Utilization efficiency; Physiological efficiency and agronomic efficiency; Industrial potatoes.

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