2.1 Experimental site description
The experiment was conducted at the Danyang Experimental Base of Nanjing Agricultural University (31°56′39″N, 118°59′13″E, 80m). The test site belongs to the main high-yield rice cultivation area in the lower reaches of the Yangtze River in China. The climate belongs to the subtropical monsoon climate and the soil condition is loam with a pH value of 6.04. The total soil nitrogen was 1.4 g•kg-1, the available nitrogen was 7.8 mg•kg-1, the available phosphorus was 20.1 mg•kg-1 and the available potassium was 91.7 mg • kg-1. The temperature and precipitation in the experiment are listed in the supplementary data.