Effect of Thiobacillus, sulfur, and phosphorus on the yield and nutrient uptake of canola and the chemical properties of calcareous soils in Iran

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Abstract
This factorial experiment consists of four levels of sulfur+Thiobacillus and three levels of triple superphosphate arranged in a completely randomized block design in three regions. With an increased sulfur+Thiobacillus and phosphorus (P), grain yield, phosphorus, iron (Fe), and zinc (Zn) uptake of canola increased in Qom and Mazandaran. Combined treatments of S2000T40 and P100% showed these properties most. In Safiabad, S1000T20 resulted in a significant increase of P, Fe, and Zn uptake of canola, and no significant effect was found on the grain yield. The highest Fe and Zn concentrations in Qom soil was measured in S2000T40. In Safiabad, maximum Fe concentration in soil was registered by S1000T20 and P65%. The minimum soil pH of Qom and Mazandaran was recorded by S1000T20 and S2000T40, respectively. The effect of sulfur and Thiobacillus on nutrients uptake and canola yield was good and indicates its potential for alleviating the impacts of calcareous soils.

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