Abstract

QUESADA-ROLDAN, Gustavo  and  BERTSCH-HERNANDEZ, Floria. Obtaining of the absorption curve for the FB-17 tomato hybrid. Terra Latinoam [online]. 2013, vol.31, n.1, pp.1-7. ISSN 2395-8030.

A nutrient accumulation or uptake curve of the FB-17 tomato hybrid was obtained during a crop cycle in a commercial plantation in San Isidro de Heredia, Costa Rica. The content of N, P, K, Ca, Mg and S was determined in 13 samples of three sections of the plant: root, aerial part and fruit. The nutrient accumulation curve for this hybrid was based on concentrations of these nutriments and dry weight of the plant sections. Nutriment extraction was calculated considering a density of 19 230 plants ha-1 and an approximate yield of 162 Mg ha-1. The element extracted in the largest quantity was K with 762 kg ha-1, followed by N with 522, Ca (364), Mg (93), S (79) and P (39 kg ha-1). The greatest demand for all the elements was at 130 days, period significant in fruit set and fill; fruiting alone further explains the variations in demand by nutriments. Towards the end of the production cycle an accumulation of N, P and K was observed mainly in fruit, while most of Ca, Mg and S remained in the aerial part of the plant. The high nutriment requirements of the FB-17 hybrid respond to a yield expectation of 100 Mg ha-1, and constitute the minimum that must be supplied to the plant by fertilization to ensure optimum production.

Keywords : Solanum lycopersicum L.; requirement; nutriments; curve.