Abstract

FLORES-LOPEZ, Román et al. NPK levels for the production of potato minitubers in greenhouse in the Toluca Valley. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.5, pp.1131-1142. ISSN 2007-0934.

The nutrition potato (Solanum tuberosum) in greenhouses in Mexico is done by applying solid formulations of NPK, foliar applications and the use of non-specific hydroponic nutrient solutions; therefore, yields are low, varied and inconsistent. The objectives of this research were to: 1) determine the concentrations of NPK suitable for the production of potato clone 020342.1 under hydroponics conditions; and 2) assess the yields of minitubers under greenhouse conditions. The experiment was conducted in the experimental greenhouses in Campo Toluca Zinacantepec, State of Mexico in 2012. The substrate used was perlite; San Cristobal design was used, with four levels of NPK respectively and twelve treatments; the variables were chlorophyll, leaf area index (IAF), fresh weight, number and diameter of minitubers. Treatments with higher chlorophyll content during the crop cycle were: T12 and T10 with 144 and 158 µg g-1 respectively; height, fresh weight and number of tubers significant differences, where the best treatments were the T10, T12, T8 and T6. For the fresh weight of tuber, they highlighted the T6 and T10, with 230 and 232 g respectively. For the total number of tubers, protrude T8 with 18.6 tubers per plant, T12 with 18.2, T10 to 18.1 and T6 to 16.8. In conclusion, the highest concentrations of 150N and 300K and increased tuber yield minituber clone 020342.1 potato hydroponics.

Keywords : Solanum tuberosum; hydroponics; nutrition.