科研之友
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摘要
The fate of fertilizer N applied with different irrigation amounts in tobacco fields was quantitatively studied by applying N-15 double-labelled NH4NO3 in lysimeters. The N-15 (fertilizer N originating from the fertilizer applied in 2011) in tobacco plants, N-15 in soils and N-15 loss were observed continuously from 2011 to 2014. The results showed that 21.6% of N-15 was utilized by tobacco plants, 72.1% remained in the 0-60cm soil layer and 6.3% was lost from the soil-plant system after the first season's harvest (2011) of flue-cured tobacco. During the four seasons from 2011 to 2014, cumulative utilization of N-15 by tobacco plants was 34.3%, while 54.2% remained in the 0-60cm soil layer, and 11.5% was lost via mechanisms such as leaching and volatilization. The fate of N-15 in terms of accumulation in plants and soils or losses from the soil-plant system from 2012 to 2014 was greatly affected by the fertilizer and irrigation management strategies in 2011. The results of this investigation suggest that the major amount of fertilizer N applied during the first season remains available in the soil for utilization by tobacco plants after 4 years.
