In order to improve the nitrogen use efficiency and reduce the resource waste and the risk of environmental pollution

a study on the leakage loss of controlled release nitrogen fertilizer (CRNF) application in hilly area of South China was conducted. The effects of CRNF (T3～T6) application on nitrogen dynamics and loss of TN，NO3-—N and NH4+—N in leachate water under different treatments in Spring Maize soil were explored. The results showed that the leakage water was 3 888.40～3 948.69 L when the nitrogen application rate was 168～240 kg N/hm2

hence fertilizer application rate had no significant effect on the leakage volume (P＞0.05). Average leaching loss concentration of TN

NO3-—N and NH4+—N under T3 treatment were as follows 32.66 mg/L

29.41 mg/L

and 0.26 mg/L. Compared with the application of common urea (T2)

T3 treatment with the same amount of nitrogen application rate decreased by 24.99% (P＜0.01)

25.56 % (P＜0.01) and 25.71 % (P＜0.05)

respectively. Meanwhile

the loss load decreased by 24.10 %( P＜0.01)

25.62 %( P＜0.01) and 18.97 %(P＞0.05)

respectively

and namely 53.07

47.14 and 0.47 kg N/hm2. When the nitrogen fertilizer application rate was reduced by 10 %

20%

30%

the corresponding average TN loss concentration were 28.81

26.50 and 24.34 mg/L

which decreased by 11.79%（P＞0.05）

18.86%（P＜0.05）

25.47%（P＜0.05）compared to T3. Similarly

the loss load were 41.78

36.62

and 33.90 kg N/hm2

which decreased by 21.27%（P＜0.01）

31.00%（P＜0.01）

36.12（P＜0.01）

respectively. NO3--N is the major component of leakage nitrogen loss

which accounted for 88.83%～92.75% of TN loss load

and DON was also not negligible. During the planting of Spring Maize in dry land

the CRNF application rate with 192 kg/hm2 could effectively reduce the loss of nitrogen leaching and the risk of environmental pollution

and even increase yield and efficiency.