Effects Of Fertilization Reforming On The N₂O Emission In Paddy Soils

Three treatments in a 30-year fertilization experiment of paddy soil was adjusted to the following seven treatments:the original high organic material treatment(HOM), the high organic material treatment reforming from the original normal organic material treatment(N-H), the original normal organic material treatment(NOM), the normal organic material treatment reforming from the original chemical fertilizer treatment (C-N), the chemical fertilizer treatment reforming from the original high organic material treatment(H-C), the chemical fertilizer treatment reforming from the original normal organic material treatment(N-C), the original chemical fertilizer treatment(CF). N2O flux of the original and changed treatments during double rice cropping rotation cycle in 2013-2014 was measured.The results show that:(1) change after fertilization management, annual soil N2O emission rule less affected, organic fertilizer can reduce N2O emissions, chemical fertilizer can increase the N2O emissions, but the differences were not significant. Therefore, in the short term (3 to 5 years), fertilizer management of change for red soil fertility paddy soil N2O is subtle, but long-term (30-50 years) using a single chemical fertilizer application and increase the effect of organic fertilizer on rice soil N2O is significant.(2) both organic to inorganic fertilizer and inorganic fertilizer (fertilizer) change (increasing) applied organic fertilizer processing, the change trend of soil soluble carbon and nitrogen is more consistent. Soluble ammonium nitrogen content peak appeared in the early rice transplanting, and with the lower with the advancement of fertility, while soluble nitrate content peak appeared field drying period of rice production, rice growth period at the ends of the soluble nitrate.