| Sumario: | The objective of this study was to analyze tomato responses to water requirements
(evaluated by means of balance lysimeters), leaf area, yield, quality and its relationship
with weather, depending on the number of stems. The work was carried out in a greenhouse
under hydroponic conditions. Tezontle (Stuff) was used as a substrate and a drip
irrigation system was installed. The experiment consisted of three treatments, with one
(T1), two (T2) and three (T3) stems per plant. The daily crop evapotranspiration was
0.30 L m-2 in the initial stage, up to 4.41, 4.77 and 6.0 L m-2, in the stage of maximum
demand for T1, T2 and T3. The gross volume applied throughout the cycle was 352.2,
388.4 and 434.7 L m-2 for T1, T2 and T3, with productivities of 49, 41 and 36 kg m3 and
yields of 20, 18 and 16 kg m-2 for T1, T2 and T3. Regarding quality parameters in size, T1
was the best, with 69, 23, 8 and 1% fruits of first, second, third and small fruits per plant
respectively. The meteorological variables such as; temperature, wind, relative humidity,
vapor pressure deficit and atmospheric water potential determined the consumption of
water and nutrients in crops and are variables for irrigation scheduling.
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