Analysis and Evaluation on Nitrogen Application Status，its Utilization Efficiency，its Influence on Yield and Soil Fertility Contribution Rate to Greenhouse Tomato in China
1 Media Education College，Xinjiang Radio and Television University，Urumqi 830049，Xinjiang，China；2 Agricultural
Resources and Environment Institute，Hebei Academy of Agriculture and Forestry Sciences，Shijiazhuang 050051，Hebei，
China；3 College of Resources and Environment Sciences，China Agricultural University，Beijing 100193，China
This paper evaluates present nitrogen input amount，nitrogen use efficiency and soil fertility
contribution rate of greenhouse tomato，by analyzing 79 field experiments data from 57 domestic published papers.
The results showed that under conventional application model，the total nitrogen input was 1 313 kg·hm-2，
including nitrogen 617 kg·hm-2 from manure and 705 kg·hm-2 from chemical fertilizer. Under optimized
application model the nitrogen from manure，chemical fertilizer and the total nitrogen input were 581.7 kg·hm-2，
353 kg·hm-2 and 936 kg·hm-2，respectively. The tomato yield under optimized application model was 8% higher
than that of the conventional application model.Under conventional application model，the average values of partial
factor productivity（ PFP），agronomic efficiency（ AE） and recovery efficiency（ RE） were 155.7 kg·kg-1，28.0
kg·kg-1 and 9.5%，respectively. Under the optimized application model，the average values of PFP，AE，RE
were 356.3 kg·kg-1，63.6 kg·kg-1 and 17.8%，respectively. The average soil fertility contribution of conventional
application and optimized application were 72.9% and 70.4%，respectively. So，compared with the conventional
application model，the optimized application model has great potential in reducing chemical nitrogen fertilizer.
