Abstract: Response of Olsen-P to P balance in a yellow fluvo-aquic soil was studied in a long-term fertilization experiment carried out in Xuzhou,Jiangsu province for the purpose of providing a theoretical basis for the scientific application of phosphate fertilizer in the yellow fluvo-aquic soil farming areas.The relationships between Olsen-P change and the budget of soil P balance in the eight treatments were studied by the method of linear regression based on a 34-year (1980-2014) experiment.The results showed that long-term application of CK and N resulted in significant decrease of Olsen-P by 0.16 and 0.11 mg/kg,and M,MN,MNP,MNPK resulted in significant increase of Olsen-P by 1.12,1.00,1.65,1.49 mg/kg,respectively.While the soil Olsen-P content remained stable in the NP and NPK treatments.The increase amount of Olsen-P changed with P balance.Application of CK and N reduced the amount of Olsen-P significantly.With an average wane of 100 kg phosphorus per ha,the soil Olsen-P decreased by 0.68 and 0.47 mg/kg,in the CK,N treatments,respectively.Application of M,MN,MNP and MNPK increased the amount of Olsen-P significantly.With an average surplus of 100 kg phosphorus per ha,the soil Olsen-P increased by 1.98,2.19,1.56,1.42 mg/kg,in the M,MN,MNP and MNPK treatments,respectively.Long-term application of organic combined with chemical fertilizer resulted in the increase of the amount of Olsen-P is higher than another treatments.

Key words: Long-term fertilization, Yellow fluvo-aquic soil, Olsen-P, P balance

CLC Number: 

• S143.2