Effects of ammonium and nitrate ratio on growth,yield,quality and nitrogen uptake of cherry tomato
To investigate the effects of ammonium and nitrate ratio on the growth,yield,quality and nitrogen absorption of cherry tomato,this experiment adopted the planting method of seedling cultivation and transplanting in the greenhouse,and the ratio of NH4+-N and NO3--N was set as 100∶0(CK),75∶25(T1),50∶50(T2),25∶75(T3),0∶100(T4),and the plant height,stem diameter,leaf area,SPAD value,plant biomass,fruit nitrogen uptake,yield and fruit quality of cherry tomato at different growth stages were measured.The results showed that all of the fruit longitudinal diameter,fruit shape index,single fruit mass and fruit hardness presented a trend of first increasing and then decreasing with the increase of NO3--N ratio.In terms of fruit flavor quality,T3 treatment was conducive to improve soluble solids,soluble sugars and organic acids content,and sugar-acid ratio in fruits,increasing by 20.75%,33.10%,34.29%and 28.88%,respectively,when compared with total ammonium treatment.All the plant height,leaf area and SPAD value of cherry tomatoes firstly increased and then decreased with the increase of NO3--N ratio.Except for the T3 treatment during fruit setting,which was slightly lower than T2 treatment,the peak value of other stages appeared in T3 treatment.With the increase of NO3--N ratio,the cumulative nitrogen uptake of plants increased at first and then decreased,and reached a maximum val-ue of 113.33 kg·hm-2 in T3 treatment.With the increase of NO3--N ratio,the yield of cherry tomato showed a trend of first increasing and then decreasing.Compared with CK,T3 treatment increased the yield by 17.90%,and the cumulative nitrogen utilization rate and nitrogen partial productivity are 226.66%and 126.66 kg·kg-1,respectively.According to vari-ous indexes,when the ratio of NH4+-N and NO3--N is 25∶75,it can significantly promote the growth and development of cherry tomatoes,increase fruit yield and improve fruit quality.
Cherry tomatoNitrogen formGrowth and developmentYieldQuality
万方数据
维普
