Resumo

DELL'AMICO-RODRIGUEZ, José M.; GUILLAMA, Rodolfo  e  GONZALEZ, María C.. Response of five tomato lines (Solanum lycopersicum L.) grown in two irrigation variants, under field conditions. cultrop [online]. 2018, vol.39, n.4, pp. 78-85. ISSN 1819-4087.

The tomato crop, for its biological benefits, is an excellent model for basic and applied research programs. In addition, due to its nutritional properties it has reached a considerably high popularity worldwide. On the other hand, the drought stress currently aggravated by global warming limits the crops productivity throughout the world. Therefore, it is essential to obtain cultivars with greater water use efficiency. The work consisted to evaluating the behavior of five tomato lines under field conditions and cultivated in two irrigation variants. The seedlings were planted in blocks of 1000 m² each in a leached red ferralitic soil. Two soil moisture treatments (T1 and T2) were established, which were differentiated by their arrangement of the drip irrigation lines. T1 where the humidity was maintained in a range between 22 % and 36 % (well supplied) and T2 where the humidity was between 14 and 22 % during the experiment time (stress treatment). Evaluations of Volumetric Soil Water Content (CVA) and stomatal conductance (gs) were made at 23, 30, 39, 44 and 51 DDT and the yield and its components. The results showed a differentiated effect of the treatments on soil moisture, which induced significant differences of the gs in favor of the plants cultivated in T1. The decrease of the irrigation applied to the plants of the different lines cultivated with T2, in most of the cases did not have a negative effect on the yield and their components

Palavras-chave : yield; water plant relations; soil moisture.

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