Influence of mineral and organic nitrogen on tuber dry matter and specific gravity of potatoes

Rodrigues, M.A.; Martins, Fernando; Coutinho, João

http://hdl.handle.net/10198/3272

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Authors

Rodrigues, M.A.

Martins, Fernando

Coutinho, João

Abstract(s)

Dry matter percentage (DIv1%) is an important qualitative characteristic of potato tubers. Frequently N fertilisation significantly affects DM% but there have been several] studies differing in their results. According to Jenkins and Nelson (1992), numerous published reports indicate a reduction in DM%, others show no effects of N and some recorde instances where final DM% increases significantly as N rate increases. The DM% is normally estimated by the specific gravity (SG), despite some known limitations. The influence of mineral and organic N fertilising on dry matter content of the cv Desirée, the most important variety in Portugal, was studied during three years (1995-1997). For the last two years (1996-1997), specific gravity was also determined. The relationship between the specific gravity and the city matter content of tubers was established and analysed.

URI

http://hdl.handle.net/10198/3272

Citation

Rodrigues, Manuel; Martins, Fernando: Coutinho, João (1998). Influence of mineral and organic nitrogen on tuber dry matter and specific gravity of potatoes. In Proceedings of 5th ESA - Congress. vol. I. Nitra