新修梯田施黑矾改土增产机理探讨

新修梯田施黑矾加速土壤熟化,是晋西的改土增产经验。作者采用盆栽和田间对比试验的方法,测定土壤理化性质和微量元素变化,探讨了新修梯田施黑矾改土增产的机理。新修梯田生土部位施黑矾(FeSO~4)后,在呈碱性反应的黄土中与碳酸钙(CaCO~3)化合,释放的二氧化碳(CO_2)气体可促使土壤膨胀发暄,土壤孔隙度增加1.03％～2.73％;其化合物氢氧化铁Fe(OH)_2]在水溶条件下形成胶体物质和有机胶体,可增加土壤团聚体。黑矾杂质中所含有效铁、有效锌等微量元素,有促进作物生长的作用。施黑矾后作物生长期土壤pH值约降低0.2,可使土壤中铁离子的活性提高4倍。

Study on the Mechanism of Increasing Output Due to Improving the Soil by Apply-ing FeSO_4 Fertilizer in New Terraced Field

Accelerating the ripening of soil by applying FeSO_4 fertilizer in new terraced field is the main experience of improving the soil for increasing ou tput in the Westem Shanxi Province With the comparative method of experiment both in pot and field.the authors measure the physical and chemical properties of soil and the variation of trace elements in soil and probe in to the mechanism of increasing the output due to improving the soil by fertilizing FeSO_4 in new terraced field The mechanism can be expounded as follows after applying FeSO_4 fertilizer on the immature soil of loess with alkali reaction in new terraced field FeSO_4 combines with CaCO_3 releasing gas CO_2.which can make soil fluffy or spongy and increase the soil por-osity by 1.03 to 2.73 percent;under the condition of soluble water,the oxide Fe(OH)_2 can dissolve in water and form into colloid or organic colloid increasing soil aggregation Trace elements which are impurities in the matter of FeSO_4,such as effection Trace esements which are impurities in the matter of FeSO_4 such as effective Fe and effective Zn,can improve crop growing After applying FeSO_4 such as effective Fe and effective Zn,can improve crop growing After aqqlying FeSO_4 fertilizer the pH value of soil in crop growing period decreases by 0.2 and the activity of Fe ion increases by times.