In terms of corn yield, R3 gave the highest (7,516 kg/ha) of the treatments examined, whereas R4 gave the lowest (5,536 kg/ha).An identical pattern was obtained in a five-year experiment.

• R3轮作中的玉米产量最高（7516公斤/公顷），R4中的玉米产量最低（5536公斤/公顷），五年的试验结果一致。