Evaluation Effects of Sulphate Fertilizers on Soil pH, Fe and Mn Uptake by Rice (Oryza sativa L.) under Water Logged and Calcareous Soils Conditions

BACKGROUND: Under calcareous soils where soil pH is high, micro-elements content is deficient in the crop body. It is because of its precipitation on the clay soils and less uptake by the Rice. OBJECTIVES: The present research, studies the effect of basic, Sulphur powder and micro-element fertilizers on soil pH in the paddy field and uptake of Fe and Mn elements by Rice crop. METHODS: Current study were carried out according split-split plot experiment based on randomized complete block design with 3 replications. The main plot included Macro-elements in two levels (1-control and 2-NPK-fertilizers as basic fertilizer) and Sulphur as sub plot in two levels (1-control and 2-S-powder) also micro-elements belonged to sub-sub plot in five levels (1-control, 2-Zn, 3-Cu, 4-Mn and 5-Zn, Cu, Mn-Sulphate fertilizers). RESULT: This research has shown that, Sulphur and microelements has affected soil pH at tillering, panicle initiation and seed maturity stages, significantly. These fertilizers have also affected Fe and Mn content in the leaves and grains, significantly. The results showed that with decreasing soil pH, Fe and Mn uptake and grain yield increased. CONCLUSION: The least soil pH at all three stages and the most Fe and Mn content in grains were attained when NPK+S+Zn, Cu, Mn-Sulphate fertilizers applied together in this research. Thus, to obtain minimum soil pH and maximum Fe and Mn content in Rice grain under calcareous soils conditions, this treatment can be recommended.