| At present,the utilization rate of nitrogen fertilizer in season is low in China,only30%～35%.Excessive nitrogen fertilizer application not only causes the waste of resources,increases the cost of agriculture,but also causes serious impact on the ecological environment.In recent years,in order to reduce the environmental problems caused by the application of chemical fertilizers in grain production,the research,development and application of new fertilizers have attracted much attention,especially through the addition of synergistic carriers such as humic acid,amino acid and alginic acid,and the rapid development of synergistic compound fertilizers.There are many reports on improving the quality and efficiency of compound fertilizer,improving the utilization rate of fertilizer,promoting crop growth and improving crop yield,while there are few reports on the environmental effects and evaluation of compound fertilizer.Therefore,field trials were conducted to explore the effects of nitrogen reduction application of synergistic compound fertilizer on NH3volatilization,CH4 and N2O emissions in the paddy field,in order to provide theoretical basis for rational application of synergistic compound fertilizer and environmental effect evaluation.Six treatments were set up in the experiment,including no fertilization（CK）,conventional fertilization（CF）,conventional fertilization with 20%nitrogen reduction（CR）,humic acid compound fertilizer with20%nitrogen reduction（HR）,amino acid compound fertilizer with 20%nitrogen reduction（AR）,alginate compound fertilizer with 20%nitrogen reduction（SR）.The main results are as follows:（1）Compared with CF treatment,CR,HR,AR and SR treatments significantly reduced the total ammonia volatilization loss by 38.9%-54.7%.Compared with CR treatment,the total ammonia volatilization loss of AR and SR treatments decreased by20.5%and 25.8%,respectively.In addition,the concentrations of NH4+-N in the surface water were the important factor in ammonia volatilization,which significantly reduced by the treatments of reducing nitrogen fertilization,and the average NH4+-N concentration in surface water of three synergistic compound fertilizers decreased by5.5%-18.7%compared with that of conventional fertilization.（2）Compared with CF treatment,the CH4 and N2O emission of three synergistic compound fertilizer treatments（HR,AR and SR）were significantly decreased by29.85%-39.07%and 38.95%-51.41%.Under the same nitrogen reduction condition,compared with CR treatment,the CH4 emission of three synergistic compound fertilizer treatments（HR,AR and SR）was decreased by 18.59%-29.30%,and HR treatment reach a significant level;The three synergistic compound fertilizer treatments all decreased N2O emission,and HR and SR treatments significantly decreased N2O emission by 26.67%and 20.00%,respectively.（3）Compared with CF treatment,HR,AR and SR treatments significantly reduced the GWP and the GHGI of rice season by 30.68%-40.00%and by 29.03%-38.71%.Under the same nitrogen reduction condition,compared with CR treatment,the GWP of HR,AR and SR treatments were decreased by 17.62%～28.69%,and HR treatment reach a significant level;the GHGI of HR,AR and SR were significantly decreased by 21.43%-32.14%。（4）Under the condition of nitrogen reduction,the plant nitrogen uptake under the synergistic compound fertilizer（HR,AR and SR）was significantly increased by 20.0%-31.8%compared with CR treatment.And the nitrogen use efficiency of HR,AR and SR treatments was significantly higher than that of CF and CR treatments.In terms of yield,the grain yield of three synergistic compound fertilizer treatments（HR,AR and SR）was not significantly reduced compared with conventional fertilization treatment.Under the same nitrogen reduction level,the yield of three synergistic compound fertilizer treatments（HR,AR and SR）were significantly higher than that of CR treatment,which increased by 4.4%-4.8%. |
PDF Full Text Request