The lower content of °Brix in S100TE (control) may be due to the low moisture
retention in the tezontle by its high porosity, coupled with a low exchange cation capacity(ECC) and in the case of S0 treatments by the low nutritional content, as these were only irrigated with water. Heeb et al. (2005) reported that nitrogen supplied as NH4
or in organic form improves tomato taste, as these forms of N increase the sweetness in the fruit and acidity in comparison to plants receiving NO3
as the sole N source. Rodríguez