Nutrición foliar mineral en plantas hortícolas. II - El control de la pudrición apical en los frutos del tomate (Lycopersicon esculentum L., variedad Rosso Mejorado INTA) y su efecto sobre la productividad de la papa (Solanum tuberosum L., variedad C

CaCl₂ 2000 ppm in a nutritive mineral solution of KH₂PO₄ 3000 ppm, K₂SO₄ 1500 ppm, H₃BO₃ 500 ppm, ZnSO₄ 500 ppm, MnSO₄·4H₂O 300 ppm, CuSO₄·5H₂O 50 ppm, Na₂MoO₄·2H₂O 14 ppm and Fe and Na EDTA 15 ml/l was sprayed on foliage of tomato plants cv Rosso Mejorado INTA on three occasions starting before blooming in the first cluster. The treatment yielded a highly significant decrease (at 0,001% level of significance) on fruits affected by blossom end rot. No significant differences were observed in the fresh weight of healthy fruits in relation to the control and the treatment with the nutrient solution deprived of Ca. This could be due to the fact that Ca diminishes the number of growing fruits in the first cluster. In potato, three foliar sprays of a nutrient solution containing urea 3000 ppm, K₂HPO₄ 3500 ppm, MgSO₄ 3000 ppm, KCl 1500 ppm, H₃BO₃ 1000 ppm, FeSO₄·7H₂O 1500 ppm, ZnSO₄ 500 ppm, Na₂MoO₄·2H₂O 100 ppm and CuSO₄·5H₂O 50 ppm, applied on young plants at intervals of 15 days produced a significant increase (at 5% level of significance) in yield only in the case of a previous edaphic fertilization based on a combination of (NH₄)₂HPO₄ and (NH₄)₂SO₄ 300 kg/ha each one. In this case, the increase in yield was due to a higher tuber weight.