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| Effects of Nitrogen Fertilizer Dressing Ratio on Yield and Substrate Nutrients in Facilities Tomato |
| LIU Zhong-liang，GAO Jun-jie*，GU Duan-yin，YAN Wei-qiang |
| Tai’an Academy of Agricultural Sciences，Tai’an 271000，Shandong，China |
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Abstract Taking tomato variety ‘Luola’ as material，this paper set up 9 nitrogen fertilizer dressing ratio treatments to study their effects on tomato quality，yield and nitrogen use efficiency．The results showed that along with the decrease of nitrogen application in fruiting period，the net photosynthetic rate and yield all showed the tendency of rising first follwed by decreasing．In T3 treatment，the dressing ratio among nitrogen fertilizer basal application，seedling stage dressing and fructescence application were15%，0 and 85%，respectively，the leaf net photosynthetic rate and fruit yield were the highest，14.14 μmol · m-2 · s-1 and 165 122 kg · hm-2，respectively；which were increased by 17.15% and 21.75%，respectively than the CK．The contents of VC，lycopene and soluble sugar in tomato fruit all showed the tendency of first increasing then decreasing along with the decrease of nitrogen application in fruiting stage．The sugar-acid ratio under T3 and T4 treatments were 8.76 and 8.14，respectively，which could produce better taste．The agronomic utilization efficiency of nitrogen fertilizer and quick-acting nitrogen，phosphorus， potassium nutrient contents of matrix in T3 treatment were all higher．In conclution，rational nitrogen fertilizer dressing ratio could significantly enhance the leaf net photosynthetic rate，improve tomato quality，promote yield and agronomic utilization efficiency of nitrogen fertilizer．T3 treatment had the best effect．
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Received: 26 April 2019
Published: 13 June 2019
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