[Ammonia volatilization from rice field under different water conditions in lower Liaohe River Plain].
With ventilating chamber, this paper measured the ammonia volatilization from a meadow brown soil rice field after N fertilization under different water conditions in lower Liaohe River Plain. The results showed that there was an obvious ammonia volatilization after N fertilization. The total ammonia volatilization during rice growth period was 11.64-34.01 kg N x hm(-2), accounting for 4.66%-11.66% of applied N. The volatilization loss of applied N at different growth stages followed the order of tillering stage > booting stage > before transplanting, and the peak was appeared at 2-4 days after N fertilization. Field water condition had a strong effect on ammonia volatilization. Under waterlogging, both the amount of total ammonia volatilization and the percentage of lost fertilizer N were higher, and the ammonia volatilization rate increased with increasing N application rate, being significantly different among different N levels (P < 0.05). Under un-waterlogging, the ammonia volatilization was relatively low. N application rate and the ammonium concentration and pH in surface water were the main factors affecting ammonia volatilization, while P application rate had little effect when the N application rate was 180 kg N x hm(-2).
Chen
Zhen-Hua
ZH
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. eliachch@hotmail.com
Chen
Li-Jun
LJ
Wu
Zhi-Jie
ZJ
Zhang
Yu-Lan
YL
Juan
Ying-Hua
YH
D000641:Ammonia / Q000032:analysis* / Q000737:chemistry; D002681:China; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D012275:Oryza / Q000254:growth & development*; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry; D011891:Rain; D045483:Rivers; D012987:Soil / Q000032:analysis*; D014835:Volatilization; D014867:Water / Q000032:analysis*
D005308:Fertilizers; D012987:Soil; D014867:Water; D010758:Phosphorus; D000641:Ammonia; D009584:Nitrogen