Effects of Nitrogen Base Fertilizer and Topdressing Ratio on the Growth,Yield and Sugar Content of Sugar Beet under Shallow Buried Drip Irrigation
The effects of nitrogen base fertilizer and topdressing ratio on leaf thickness,vein number per unit length,plant height,leaf area index(LAI),root-shoot ratio,dry matter accumulation per plant,yield and sugar content of sugar beet were investigated under shallow buried drip irrigation for two consecutive years from 2021 to 2022.The results showed that sugar content,leaf thickness and root-shoot ratio decreased with the nitrogen topdressing ratio increase,while yield,sugar yield,plant height,LAI and dry matter accumulation per plant of sugar beet increased significantly.The yield and sugar yield of N3 treatment(base fertilizer to topdressing 6:4 of nitrogen fertilizer)were increased by 6.93％-8.04％and 6.12％-8.94％,respectively compared with CK treatment.Correlation analysis showed that sugar beet yield was positively correlated with plant height,LAI and dry matter accumulation per plant,but negatively correlated with leaf thickness.Therefore,it is recommended that the ratio of base fertilizer to topdressing 6:4 of nitrogen fertilizer is beneficial to increase the yield and sugar yield of beet under shallow drip irrigation.
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