Effects of Different Ratios of Ammonium Nitrogen and Nitrate Nitrogen on Yield and Quality of Sonchus arvensis
A pot experiment was carried out to investigate the effects of different ratios of NH4+-N and NO3--N on the yield and quality of Sonchus arvensis.Vermiculite was used as cultivation substrate,and total nitrogen concentration was 15 mmol/L.Five ratios of NH4+-N and NO3--N(100/0,75/25,50/50,25/75,0/100)were designed in the experiment.The 40-day seedlings were harvested,then indexes related to the yield and quality were determined.The results showed that the S.arvensis preferred nitrate,the yield increased along with the increase of NO3--N content,and the yield of plant supplied with only NH4+-N nutrition solution was the lowest.There was no significant difference in yield between 50/50 treatment and 25/75 treatment,but the leaf area,total nitrogen content and total phosphorus content in shoots of 50/50 treatment were 1.21,1.15 and 1.47 times of 25/75 treatment,respectively.Moreover,the nitrate and Vc contents of 50/50 treatment was 2.23 times and 1.12 times of 25/75 treatment,respectively.However,proper combination NH4+-N with NO3--N could significantly reduce the nitrate content to the level of raw food,and increased the chlorophyll content.The research suggested that 50/50 treatment was better for yield and quality.
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