SULPHUR CALCIUM AND MAGNESIUM IN PROCESSING TOMATOES GROWN IN SUB-ALKALINE OR SUB-ACID SOILS

Fertilization trials were carried out in the two-year period 1991–'92 using sulphur in combination with nitrogen, phosphorus and potassium in sub-alkaline soils, and calcium and magnesium in sub-acid soils. The last two elements were administered to the soil or to the plants.

The results of the first trial revealed significant effects of sulphur on marketable yield, ripening concentration and soluble solid content. A significant interaction between sulphur and the other elements was also detected, with positive effects on marketable yield and the soluble solids produced per unit area. Furthermore, the sulphur and phosphorus interaction resulted in a more concentrated maturity period and a higher soluble solid content.

The second trial demonstrated that the calcium — magnesium applications, regardless of the type of administration, increased the total production and the soluble solids. In the second year, the combination of these two elements also had a positive effect on marketable yield and the ripening concentrated period.

Unlike the reports of other authors, calcium did not have any effect on blossom-end rot.