Effects of nitrogen application rate on the accumulation of C assimilates after flowering and water-nitrogen use efficiency of wheat under supplemental irrigation based on soil moisture.

This study aimed to explore nitrogen fertilizer management measures to synergistically improve wheat yields and water and nitrogen use efficiency under supplemental irrigation based on soil moisture in the Huang Huai winter wheat area. Wheat variety "Yannong 1212" was used as the test material. There were three nitrogen application levels, 150 kg·hm (N), 210 kg·hm (N), and 270 kg·hm (the conventional nitrogen application rate in the Huang Huai winter wheat area, N), with the relative soil water content of 0-40 cm of each treatment was supplemented to 70% at the jointing and flowering stages.