Abstract:
Pot experiment was carried out to study the effects of 3 kinds of anionic zinc fertilizers on the growth,nutrient uptake of rice and zinc forms in soil.The results indicate that the yield is more benefitly increased by Zn(NO
3)
2 ,or by a combined application of Zn(NO
3)
2 and ZnSO
4 than ZnSO
4,ZnCl
2.The Zn content of various forms in provided soil is in the order of Ex-Zn and OM-Zn<CAB-Zn<COFe-Zn<AOFe-Zn<OMn-Zn <mineral Zn.Total Zn content in 3 forms of Ex-Zn and OM-Zn and OMn-Zn(i.e.available Zn)is 9.2mg/kg and 9.6% of the total soil Zn.The mineral Zn is the native form in paddy soil,and its content is 69.3mg/kg and 72.0%of the total soil Zn.The contents of CAB-Zn,AOFe-Zn and OMn-Zn are increased by rice planting,the Zn contents of various forms in soil are in the order of Ex-Zn and OM-Zn<COFe-Zn<CAB-Zn<AOFe-Zn<OMn-Zn<mineral Zn.Total Zn content in 3 forms of Ex-Zn and OM-Zn and OMn-Zn is 10.5mg/kg and occupies 11.2% of the total soil Zn.The mineral Zn is still the native form in paddy soil,but the content is decreased by 4.2 mg/kg and 2.7% of the total soil Zn.The amount of total Zn uptake,the total soil Zn,the content of OMn-Zn and COFe-Zn are enhanced by application of zinc fertilizer and the content of available soil Zn(i.e. Ex-Zn,OM-Zn and OMn-Zn)is increased by 12.7%~103.8%.