Resumo

WALTER, Silvana; GILETTO, Claudia Marcela  e  ECHEVERRIA, Hernán Eduardo. Balance de masa de nitrógeno en el cultivo de papa en Villa Dolores, Córdoba. Cienc. suelo [online]. 2016, vol.34, n.1, pp.93-104. ISSN 1850-2067.

The use of high rates of nitrogen (N) fertilizers in irrigated potato crops may increase the risk of N losses to the environment. The aim of this study was to evaluate the effect of N rate (250,150, 100 and 0 kg N ha^-1), source (urea and treated urea nBTPT), and timing (at planting and tuber initiation) on the N mass balance in potato crop of Villa Dolores, Córdoba. Nitrogen losses were estimated by quantifying N inputs (initial N, mineralized soil N and N fertilizer) and N outputs (N accumulated in tubers, in straw and residual soil N) in two production plots. No differences were determined between nBTPT and urea for any of the evaluated variables. Tuber yield was greater using 250 kg N ha^-1 or with 150 and 100 kg N ha^-1 at the start of tuberization. The tuber yield obtained by fractional fertilization of 100 kg N ha^-1 was lower compared to this same rate applied at the start of tuberization. Estimated N losses ranged from 29 to 235 kg ha^-1, and were significant even in the control treatment. Most of these losses were caused by nitrate leaching in the early stages of the season.

Palavras-chave : Pitrogen loss; Residual nitrogen; nBTPT.

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