The 2010 ASHS Annual Conference

Under greenhouse conditions and through drip irrigation, the response on yield and quality of crop tomato (Lycopersicon esculentum Mill “Beatrice”), the effect of four doses of nitrogen was evaluated. The treatments (250, 500, 750 y 1000kg ha^–1), were applied by a random design of blocks. The yield (ton ha^-1) total and commercial were obtained weekly after 110 days of seedling transplant. The quality of the fruit were analyzed trough measurements of total soluble solids (TSS), qualified acidity (AC) and relation SST/AC^–1 during two dates considered early and late period. The results showed that maximum yields were reached at 500 and 750 kg ha^–1 and declined when 1000 kg ha^–1 of N was applied. Values in SST were among 3.17-3.65 Brix, AC were 0.28-0.36 and SST/AC^–1 were 12.64-14.07; however all quality parameters with not significantly effects on the nitrogen fertigation treatments. Results of this study demonstrate that maximum yields of greenhouse tomato can be reached with 500-750kg ha^–1 of nitrogen fertigation and without modification of the quality be modified