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《Northern Horticulture》 2017-24
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Effects of NO_3~--N/NH_4~+-N Ratio on Enzyme Activity in Nitrogen Assimilation and Nitrogen Efficiency of Tomato Cultivated in Organic Substrate

GONG Huarui;LUO Hongyi;QI Yanyan;PANG Xiaoyan;College of Resources and Environment,Shandong Agricultural University;  
In the present research,winter-crossing greenhouse tomato was taken as experimental plants by pot containing substrate,the effects of different NH_4~+-N/NO_3~--N ratios related to N assimilation and uptake,efficiency of tomato were studied.By the equivalent N supply,compared to CK(0% NH_4~+-N),at T1(5% NH_4~+-N),T2(10% NH_4~+-N),T3(15% NH_4~+-N),T4(20% NH_4~+-N)the NR activity and NO_3~--N contents of tomato plants decreased with the increased proportion of NH_4~+-N within total N,the GS activity of tomato increased with the increased proportion of NH_4~+-N in nutrient solution.The enzyme activity responsible for N assimilation was regulated effectively by moderately increased proportion of NH_4~+-N,and the absorption and efficiency of N by tomato plants was promoted as well.When the NH_4~+-N proportion raised at T4,the field and N efficiency decreased significantly,and at T3 NH_4~+-N proportion,the field and N efficiency were better than the other treatments.Thus,based on the experimental results,it was suggested that the NH_4~+-N proportion of treatment T3 would be the optimal one.
【Fund】: 山东省自主创新及成果转化专项资助项目(2014ZZCX070402)
【CateGory Index】: S641.2
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