In recent years, cultivation area of direct-seeding rice in Jiangsu and nearby regions has been expanding rapidly, but the specific research on cultivation and breeding is very little. In this study, based on investigation of the productivity levels of direct-seeding rice in central Jiangsu province, we carried out a test of nitrogen application amount and nitrogen application ratios for direct-seeding rice, to explore the response of dry matter growth and yield to nitrogen fertilizer application. The resul...