Fertilization in potato (Solanum tuberosum L. group Phureja)

Potato fertilization is an important and pricey task, especially when soil analysis is not considered to define fertilization according to its nutritional requirements. The objective of this study was to evaluate genotypes of Solanum tuberosum group Phureja at different levels of fertilization (LF) in four localities in the department of Nariño. The LF were 0, 60, 70, and 80% of the dose used in the traditional fertilization of the area (900Kg ha-1 of 10-30-10). The split-plot design was used. The LF was located in the main plot, and the genotypes were in the subplots. The genotypes with the best performance in Botana were UdenarStCr10 with 60%, 70%, and 80% LF, UdenarStCr42 with 60% and 80% LF, and UdenarStCr42 with 80% LF with yields between 29.92 and 38.22t ha-1. In the locality of Gualmatán, the best genotype with a LF of 60% was UdenarStCr10, with 70% were UdenarStCr10, UdenarStC42 and UdenarStCr54, and with 80% were UdenarStCr1, UdenarStCr42 and UdenarStCr54 whose yields ranged between 43.58 and 52.91t ha-1. In San Juan, they were UdenarStCr10 with 60% and 80% LF, UdenarStCr42 and UdenarStCr54 with 70% LF with yields between 9.53 and 18.85t ha-1. UdenarStCr1, UdenarStCr10, UdenarStCr42, and UdenarStCr45 responded well to low fertilization levels in all locations. As a result, evaluating them in other environments is recommended to use them as commercial crops or as parents in plant breeding.