[Effect of added and residual elemental sulfur to calcareous soils on watermelon, faba bean and some soil chemical properties [effect on pH, accumulation of salt on soil surface and nodule formation]]
1986
Hattar, B.I. (Jordan Univ., Amman (Jordan))
Three rates of S (0, 1000 and 3000 kg/ha) with and without 80 kg P2O5/ha were used. Watermelon (Citrullus vulgaris) followed by faba bean (Vicia faba) were the test crops. The results obtained indicated that the amount of SO4 S extracted from the soil, which reflects the amount of S that oxidized caused significant reduction in soil pH. The reduction increased with increasing rate of S applicati2048on with more pH reduction in the soil close to the plants roots. Available P has significantly increased and was correlated with the amount of SO4 S extracted. The effect of the highest rate of S on available P was not statistically different from the effect of addition of 80 kg P2O5/ha. The combination of 1000 kg S/ha and 80 kg P2O5/ha gave the highest watermelon yield. The faba bean yield was reduced as a result of residual amount of S and this reduction was found to be related to the accumulation of salt on the soil surface resulted from possible gypsum formation. The nodule formation on the roots of the faba bean plants, was enhanced by the residual amounts of S a
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