The six treatments (Table 5.1) were applied on May 10 and June 10, respectively. One percent methylated vegetable oil adjuvant (Anyang Quanfeng Biological Technology Co. Ltd. Anyang, China) was added in treatments 1, 3, and 5, and only water with tracer was used in treatments 2, 4, and 6. Each nozzle treatment (LU110-01, LU110-015, LU110-02) corresponds to zones a, b, and c. Artificial samplers were placed at equally spaced sample sites across the center of each zone. Each sample site was 1 m apart and spanned a total of 10 m. The sample sites were repeated two times along the spray direction, with an interval of 10 m between each repetition (Fig. 5.1). The artificial samplers were fixed on a single part of the tillering stage, and double parts (upper layer and lower layer) of flowering rice in accordance with the height of rice (Fig. 5.2).