Low-potassium resistant genetic resource screening method of rice breeding

The invention provides a low-potassium resistant genetic resource screening method of rice breeding. The method comprises the following steps of selecting a rice field as an independent region to do a regionalism, and carrying out selectivity metering transplanting on different rice variety resources in different independent regions of the rice field respectively; applying a comparable metering potash fertilizer in the transplanted rice in the different independent regions, and carrying out fertilization and irrigation management according to the local standard; harvesting the different varieties of rice which is processed by low-potassium fertilization and normal potash fertilization according to equal plant number after the gold ripeness of the rice, threshing and drying the rice, weighting the rice after constant weight, calculating yield quotients (relative economic yield) of the different varieties of rice which is processed by low-potassium fertilization and normal potash fertilization, and determining