【摘要】 河北省土壤全铁平均含量为2.71%,低于全国平均值(3%)和世界平均值(3.8%).土壤有效铁(DTPA—Fe)平均值为8.2ppm.全省1/6耕地土壤有效铁低于4.5ppm,近2/3耕地土壤有效铁处于4.5—10ppm之间.本文讨论了成土母质、土壤机械组成、土壤有机质、土壤碳酸钙对土壤铁消长的影响.铁对植物的有效性与锰关系密切.供铁丰富的土壤,也可能由于锰铁比例失调,导致植物发生缺铁症.更多还原

【Abstract】 The mean value of tatol Fe of the soils in Hebei is 2.71%,lower than that of the whole contry( 3%)and the world(3.8%). Arerage available-Fe (DTPA-Fe) gets to 8.2ppm. One sixth cultivated soil of this province has a lower available iron value than 4.5ppm.Nearly two thirds is between 4.5-10ppm.This paper has discussed the influences on the growth-dedine of soil iron, of soil parent material, soil texture, organic matter, CaCo3 ,etc.The availability of Fe to plant is closely related with manganese. Plants on soil which has plantiful manganese suply may have a symptom of iron lack caused by the out of control of Mn/Fe rate.更多还原