石灰性土壤中铁肥的形态转化及其供铁机理研究

通过土培试验的方法 ,研究了复混铁肥、硫酸亚铁两种肥料在石灰性土壤中的形态转化、对土壤因子的调控作用及在有效性上的差异。结果表明 ,与硫酸亚铁相比 ,复混铁肥具有更强的调控土壤因子的能力 ,并提高了铁在有效和较有效形态中的分配 ,显著增加了有效铁的供给。结果也表明 ,交换态铁、碳酸盐结合态铁和氧化锰结合态铁是石灰性土壤中有效铁的主要供给形态。土壤pH值、有机质与土壤铁动态密切相关

Study on the transformation and iron provision mechanism of iron fertilizers in the calcareous soil

The iron transformation , their effects on soil factors and iron availability of compound iron fertilizer (CF,self-made iron fertilizer) and sulphate iron(FeSO₄) in calcareous soil were investigated by using soil incubation method. The results indicated that compound iron fertilizer could improved the distribution in available iron forms, having more powerful ability in regulating soil factors. Treatment with CF contained strikingly more available iron than FeSO₄. The results also pointed out that exchangeable iron, carbonate-bound iron and Mn-oxide-binding iron are the main provider of available iron in calcareous soil. In addition, soil organic matter and pH value related closely with the transformation of iron in calcareous soil.