Resumo

GOMEZ, Manuel Iván; MAGNITSKIY, Stanislav  e  RODRIGUEZ, Luis Ernesto. Potential yield and efficiency of N and K uptake in tubers of cvs. Capiro and Suprema (Solanum tuberosum Group Andigenum). Agron. colomb. [online]. 2018, vol.36, n.2, pp.126-134. ISSN 0120-9965.  https://doi.org/10.15446/agron.colomb.v36n2.72766.

Potato yield depends on the genotype-environment interaction, edaphic nutrient supply, and fertilization rates. The total tuber yield (FWt), dry weight of tubers (DWt), harvest index (HI) and nutrient use efficiency in tubers (NUEt) were evaluated in the Andean region in Colombia at 75, 100, 125, and 150 d after sowing using two cultivars (Capiro, Suprema), three locations with contrasting soils (Subachoque, Facatativa and Choconta) and two levels of fertilization: F0 (unfertilized) and F1 (fertilized). The Humic Dystrudept soils with fertilization (Choconta) presented late tuber filling with increases of 48 and 64% for the DWt in the cvs. Suprema and Capiro, respectively. In Suprema, the highest production potentials were obtained in fertilized soils with low fertility, with increases of 60.9% for the DWt and 75% for the HI. On the other hand, Capiro was better adapted to soils with medium to high fertility, with increases of up to 86.7% for the FWt, as compared to the unfertilized soils. This increase may be related to higher rates of nutrient recovery efficiency (RFt), higher accumulated nutrients per tuber yield (EPt) and a better NUEt because N. Suprema presented a negative EPt and RFt with HI<45% and the lowest NUE of N and K in high fertility soils, which represents a null response to fertilization and possible mechanisms of luxury consumption for the evaluated elements.

Palavras-chave : nutrient use efficiency; productive potential; luxury consumption; macronutrients.

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