The aim of this research was to study the possibility of decreasing the amount of nitrogen recommended based on the soil analysis for the potato cultivar BRS Ana, considering yield component variables. The experiment was carried out in Haplustox soil, in the experimental field of Embrapa Produtos e Mercado, Canoinhas, Santa Catarina state, Brazil, in the spring season. The treatments consisted of six nitrogen doses applied at planting time (0, 60, 80, 100, 120 and 140 kg ha-1), as ammonium sulphate. The recommended dose of N based on soil analysis was 120 kg ha-1. A randomized complete block design with four replications was used. The tuber yield of each plot was evaluated for yield component variables. Plants of BRS Ana did not respond considerably in yield to nitrogen levels higher than 100 kg ha-1, suggesting that the dose recommended by the soil analysis, 120 kg ha-1, can be reduced in 17%, without loss of yield of tubers. A larger decrease in the amount of nitrogen, however, would cause a reduction in the commercial tuber yield.
Solanum tuberosum; ammonium sulphate; productivity
