The objective of this work was to evaluate the

response of tomato hybrids to three fertilization-watering

programs based on recommendations of dose compiled

from the literature (LIT), curves of absorption (CA), and

adjustments of information previously analized (AJU).

From October 2008 to March 2009, two tomato hybrids

(FB-17 and DRD-8108) were grown in the greenhouse of

the Fabio Baudrit Moreno Agricultural Research Station in

Alajuela, Costa Rica. No signifi cant statistical differences

were found in the commercial performance in none of the

three fertilization treatments; signifi cant differences among

the hybrids were observed. The hybrid DRD-8108 surpassed

FB-17. FB-17 hybrid yield for treatment LIT was 69.3 t/ha

and 5.87 kg/plant; in the CA treatment was 75.5 t/ha and

6.39 kg/plant; and in the AJU treatment 76.4 t/ha and 6.62

kg/plant, respectively. For the DRD-8108 hybrid, the LIT

treatment yield was 85.4 t/ha and 8.55 kg/plant; in the CA

treatment was 86.7 t/ha and 7.45 kg/plant; fi nally in the AJU

treatment yield was 83.9 t/ha and 7.38 kg/plant. The high

internal greenhouse temperature was the main limiting factor

that constrained yield.

Keywords: Fertilization, vegetable, protected environment.