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Investigación Agraria

versión On-line ISSN 2305-0683


HOSHIBA KAWAVATA, Cesar Kent; FATECHA FOIS, Diego Augusto; COPPO, Jessica Caroline  y  ALVES NETO, Alfredo. Influence of doses and of two sources of potassium in the maize root system and in the electrical conductivity in the soil. Investig. Agrar. [online]. 2017, vol.19, n.1, pp.28-34. ISSN 2305-0683.

Currently various fertilization programs recommends the application of high doses of potassium, with potassium chloride (KCl) as the main source, presenting a high salt power, existing potassium fertilization alternatives that may have less effect on the soil. This study aimed to evaluate the effect of different doses of KCl and K-UP(r) in the maize root system and in the electrical conductivity in the soil. The experiment was conducted in a protected environment in Minga Guazú, Department of Alto Paraná, Paraguay, in January, 2016. The experimental design was completely randomized factorial, involving two sources of K, four doses, one fertilizer location regarding seeds, and four replications. The doses consisted of equivalent of 0, 50, 100 and 150 kg ha-1 K2O, laterally positioned at 0,03 m from the planting line. The soil was packed in plastic boxes with dimensions of 40 cm length x 20 cm width x 13 cm of height, and then the sowing of maize and the addition of KCl and K-UP(r) was made. Soil moisture was maintained in 80% of the water content at field capacity from seeding to germination. In each treatment dry mass of roots and soil electrical conductivity was evaluated. The results show that regardless of the sources of K used, these cause an increase in the electrical conductivity of the soil. The K-UP(r) obtained the lowest values of electrical conductivity and with the increase of the dose did not occurred a greater decrease in the dry mass of the root different from that observed in relation to KCl.

Palabras clave : Zea mays L.; potassium chloride; K-UP(r); soil salinity..

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