EFFECT OF LONG?TERM APPLICATION OF MANURES ON FORMS OF Fe,Mn,Cu AND Zn IN PURPLE PADDY SOIL

Effect of nine year using manure continuously on the form of Fe、Mn、Cu、Zn of purple paddy soil were studied with long term fixed location experiment as the base materials. The results showed that manure is the better source of Fe、Mn、Zn of soil,and according to the comparison between the samples manure with organic fertilizer and that manure with pure chemical fertilizer the total Fe and Mn changed very little, total Zn increased by 5.5%～30.0%, exchanging form Fe by 1.5%～12%, carbonate binding form Fe by 2.5%～8.9%, organic binding form Fe by 11.6%～19.5%, amorphous form Fe 32.5%～72.5%. Each form of Mn and Zn increased by different degrees. In addition, the consumption of soil Cu increased and total Cu occurred tendency to decrease.