Crecimiento de jitomate y calidad de frutos con diferentes concentraciones de nitrato | Tomato growth and fruit quality under various nitrate levels
2005
Gonzalez-Raya, E. | Benavides-Mendoza, A. | Ramirez, H. | Robledo-Torres, V. | Maiti, R. | Reyes-Lopez, A. | Aguilera-Carbo, A.F. | Fuentes-Lara, L.O. | Hernandez-Valencia, R.E.M.
This study was carried out to determine the effect of nitrate concentration in fertilizer solution on fruit nutritional quality, plant growth, and mineral content in shoots and roots of two tomato cultivars (Winner and Yaqui) grown in peat moss. N concentrations of 34, 79, 124, and 169 mg L(-1) (corresponding to NO3(-) concentrations of 150, 350, 550, 750 mg L(-1)) were evaluated in terms of plant response under a completely randomized factorial design with 10 replications. Fruit yield, fresh weight, and dry matter of leaves, stems, roots and fruits were determined. In addition, the content of N, P, Ca, Mg, Cu, Zn, and Fe in leaves and root tissues was evaluated. Also, mineral and carbohydrate content in fruit tissues was determined. The results indicated that highest fruit production occurred at N concentration of 79 mg L(-1); no differences were found with N concentrations of 124 and 169 mg L(-1). The highest shoot and fruit fresh weight and dry matter were obtained with 79 mg L(-1) N. On the other hand, with exception of N in leaf and fruit tissues, which rises with increases of N fertilization, no changes were observed in the concentration of the other mineral nutrients in leaf and fruit tissues. There was no significant effect of N on the accumulation of starch and sugars in the fruit.
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