Abstract:Anji white tea has high economic benefits, and large amount of chemical fertilizer has been applied in Anji white tea, while nitrogen and phosphorus loss in tea garden has been one of main sources of agricultural non-point pollution in the Xitiaoxi River Basin. This study continuously observed the effects of fertilization reduction and inter-row planting of trees on controlling nitrogen and phosphorus loss in the runoff of white tea garden through field runoff plot experiment with two growth cycles. The experiment included four treatments, which were conventional fertilization (CK), nitrogen and phosphorus reduction (T1), phosphorus reduction with inter-row planting of Albizia julibrissin (T2), and nitrogen and phosphorus reduction with inter-row planting of A. julibrissin (T3), and each treatment had two replicates. The results showed that the runoff and sediment amounts of inter-row planting treatments (T2, T3) were significantly less than those of the treatments with no inter-row planting (CK, T1) (P<0.05) in each growth cycle. During the two observation cycles, the cumulative losses of total nitrogen, all nitrogen fractions, total phosphorus and inorganic phosphorus in runoff water of treatment CK were all significantly higher than those of the other three treatments, the cumulative nitrogen outputs in sediment of treatment CK was significantly higher than those of treatment T3, and the cumulative phosphorus outputs in sediment of treatment CK was significantly higher than those of treatment T2 and T3 (P<0.05). Nitrogen loss in white tea garden was mainly with runoff water, and phosphorus loss was mainly with runoff sediment. Reduction of nitrogen and/or phosphorus application, inter-row planting and the combination of the two measures could effectively decrease the runoff loss of nitrogen and phosphorus in the white tea garden, and the combined measures of nitrogen and phosphorus reduction with inter-row planting were more effective. Thus, the fertilization doses of N 270 kg/hm2, P2O5 90 kg/hm2, and inter-low planting density of 200 plants/hm2 A. julibrissin were recommended for the local white tea culture.