Effect of different long-term fertilization treatments on nitrogen mineralization characteristics in soil
[Objective] This study aimed to understand the soil nitrogen supplying capacity of different long-term fertilization treatments.[Method] An intermittent leaching aerobic incubation experiment was conducted to evaluate the effects of different long-term fertilization treatments (No-F,no fertilizer for 20 years;NPK,applied NPK fertilizers for 20 years;and MNPK,applied cattle manure plus NPK fertilizers for 20 years) on N mineralization in soil layers of 0-20 cm,20-40 cm and 40-60 cm in winter wheat-summer fallow rotation system.[Result] Compared with the NPK treatment,the MNPK treatment significantly increased soil organic carbon,total nitrogen,cumulative mineralized N and potentially mineralizable nitrogen (N0) in soil layers of 0-20 cm and 20-40 cm.The cumulative N and N0 in layer of 0-60 cm were significantly higher in the MNPK treatment than in the No-F treatment.For all treatments,the proportions of N0 to total N were 19％-23％,9％-12％ and 6％ in layers of 0-20 cm,20-40 cm and 40-60 cm,rcspectively.The proportion of N0 to total N was the highest in the MNPK treatment.The ratios of cumulative N in layers of 0-20 cm,20-40 cm,and 40-60 cm were 62％-71％,20％-27％,and 9％-12％,respectively.The MNPK treatment had the highest ratio of cumulative N in layer 0-20 cm to layer 0-60 cm.[Conclusion] Long-term combined application of cattle manure with inorganic fertilizer was an efficient way to enhance the nitrogen supplying capacity in soil layer of 0-60 cm.
NETL
NSTL
万方数据
维普
