Evaluation of sulfur containing amendments for soil crusting, seedling emergence of tomato and DTPA extractable micronutrients

摘要

A greenhouse experiment was conducted to evaluate the effect of five amendments (H₂SO₄, Al₂(SO₄.18H₂O, FeSO₄.7H₂O, and CaS₅ and CaSO₄.2H₂O) on crust formation, seedling emergence, dry matter yield (DMY) of tomato and soil properties in a sodic soil from the Safford Agricultural Center. When applied in equivalent quantities (600 kg/ha S), sulfuric acid and Al-sulfate proved to be the best anti-crusting agents and gypsum the least. Tomato seedling emergence and DMY increased with addition of H₂SO₄ followed by gypsum. Sulfuric acid was superior in reducing ESP in 0-3 cm depth, while EC was increased with additions of all amendments. In 3-8 cm depth the amendments affected pH, EC and ESP less than at the 0-3 cm depth. DTPA extractable and plants concentrations of Zn, Fe and Mn significantly increased with the addition of various amendments, while Cu was not effected by any amendments.