Resumo

PARRA TERRAZA, Saúl; MENDOZA PALOMARES, Guadalupe  e  VILLARREAL ROMERO, Manuel. Relation nitrate / ammonium / urea and potassium concentration in hydroponic tomato production. Rev. Mex. Cienc. Agríc [online]. 2012, vol.3, n.1, pp.113-124. ISSN 2007-0934.

Tomato plants (Solanum lycopersicum L. cv. IB-9) were grown in ahydroponic system in orderto evaluate the effect of the ratio nitrate, ammonium, urea (100/0/0, 85/15/0, 85 / 0/15 and 85/7.5/7.5) and the concentration of potassium (7 and 9 mol m-³) in fruit yield and mineral composition of plants. The fruit yield was unaffected by the treatments, so that it can substitute 15% of the total nitrate nitrogen to the nutrient solution with an equal percentage of nitrogen or urea, or a mixture of ammonia and urea, each at 7.5 %. The phosphorus content in leaves was significantly increased by the interaction of 85/15/0 and 9 mol of potassium m-³, while the calcium concentration in leaves 100/0/0 statistically decreased and 9 mol m-³ potassium.

Palavras-chave : Solanum lycopersicum L.; nutrient content; hydroponic; nutrient solutions.

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