Performance of an Automatic Variable-Rate Fertilization System Subject to Different Initial Field Water Conditions and Fertilizer Doses in Paddy Fields

High-performance fertilization equipment with high uniformity is essential for the improvement of fertilizer use efficiency in paddies. The performance these fertigation systems might be affected by initial field conditions and doses. In this study, an automatic system (SF) was investigated; investigation had two water doses, manual farmers (FF) used as control. After fertilization, Christiansen coefficient (CU) SF paddies higher than FF paddies, non-flooded (SFN) highest. With time, CU treatments poor improved; it driven osmotic potential ions, but far from exceeding that originally conducted CU. For treatments, dose did not affect significantly; so, can match efficient strategies more precisely. As water-saving irrigation (WSI) conducive to production promotion topdressing, implement management practices WSI paddy fields suggested.