Method for evaluating low-nitrogen resistance of rice by utilizing yield reduction degree

The invention provides a method for evaluating low-nitrogen resistance of rice by utilizing the yield reduction degree, which comprises the following steps: setting four different nitrogen application levels, including no nitrogen fertilizer application, nitrogen reduction by 50%, nitrogen reduction by 25% and conventional nitrogen application, measuring the yield of rice, comparing the yield reduction degree under the nitrogen reduction condition, and screening out a low-nitrogen-resistant rice variety. In addition, it is also clear that the tiller number and the seed number per ear are reduced on the whole under the nitrogen reduction condition, the tiller number difference of the low-nitrogen-tolerant rice variety Longdao 26 and the pine japonica rice variety 22 under the nitrogen reduction condition is not significant, the tiller number of the low-nitrogen-intolerant rice variety Longdao 22 and the Jinghuai No.1 is significantly reduced, and the seed number difference expression is not significant. The lo