Abstract:Reducing application and promoting efficiency of fertilizers is of great significance for rationally controlling fertilizer usage, promoting green agricultural development, and implementing rural revitalization. Urea, diammonium phosphate and potassium sulfate were used in this study as the test fertilizers, the cultivated experiments were conducted study the effect of nitrogen fertilizer reduction on the migration of available nutrients in fertisphere of sandy and loamy fluvo-aquic soils. Based on the high-yield recommended fertilization of N 210 kg/hm2, when nitrogen fertilizer application is reduced by 20%, the proportion of available nitrogen, phosphorus and potassium in fertisphere of sandy fluvo-aquic soil are increased by 15.71%, 7.27% and 13.14% compared with the habitual fertilization of N 315 kg/hm2, and increased by 10.54%, 3.79% and 8.98% compared with the high-yield recommended fertilization. The migration of available nitrogen is lower than that of habitual fertilization, and is equivalent to the high-yield recommended fertilization, which is 46 mm; there is no significant difference in the migration of available phosphorus among the three fertilization treatments, and the migration of potassium is increased by 15.79% and 10.00%, respectively. The proportions of available nitrogen and phosphorus in fertisphere of loamy fluvo-aquic soil are increased by 53.08% and 3.44% compared with the habitual fertilization, and are increased by 14.28% and 6.89% compared with the high-yield recommended fertilization; there is no significant difference in the migration of available nitrogen and phosphorus with the habitual fertilization and high-yield recommended fertilization; the proportion and migration of available potassium are lower than those of the other two treatments.