For treatments 1, 7 and 8, the land was first leveled. All treatments received 30 mg of manure, 150 kg of N, and 90 kg of 1 P2O5 ha− . The ridge of treatment 7 was built and mulched with plastic film, and seeds were seeded in the ridge. For the RFRHS treatments, ridges were built first, and then manure and fertilizer were applied in the furrows. After that the furrows were mulched with gravel–sand and plastic film, seeds were seeded in the furrows