Interaction between Nitrogen Application Rate and Planting Density on Agronomic and Economic Characters of Flue-cured Tobacco
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摘要: 寻求适合烤烟生长的最佳施氮量和种植密度组合, 为烤烟的优质高产高效提供科学依据。以秦烟96为材料, 采用大田裂区试验设计, 种植密度(A)为主区, 施氮量(B)为副区, 分别设置3个水平, 研究氮密互作对烤烟圆顶期农艺及经济性状的影响。结果表明, 适宜密度和施氮量有利于烤烟生长发育和提高产量、产值, 一定密度下, 均以中、高氮为宜;一定施氮下, 低、高氮以中、高密度而中氮以低、中密度为宜。二者互作效应显著, 氮肥效应大于密度。系统聚类分析可将9个处理组合分为5类, 表现较好的为中密中氮(A2B2)和中密高氮(A2B3), 高密中氮(A1B2)和低密中氮(A3B2)次之。综合分析, 本试验条件下, 秦烟96适宜密度和氮肥量分别为16 698 株/hm2和89.87 kg/hm2。可通过调节施氮量和种植密度, 充分利用氮密互作效应, 在提高肥料利用率的同时获得较好产量和经济效益。Abstract: A field experiment was conducted to determine the optimum nitrogen (N) application rate and planting density for better growth, higher yield and economic benefit of flue-cured tobacco and to provide scientific basis for production with high yield and quality using Qinyan 96 cultivar in this study. The split-plot experiment design with three regimes of planting density (A) and N rate (B) was applied to study the interaction between nitrogen and density on agronomic characters at round top stage, yield and economic characters of flue-cured tobacco. The results showed that optimal N rate and planting density could improve growth and development, enhance yield and economic benefit of flue-cured tobacco. Regardless of planting density, the best responses recorded under the high and medium N rate. Under the low/high N rate, the best responses recorded under the medium and high planting density while medium N rate under low and medium planting densities. The interaction between N rate and planting density was significant and the responses from the former were greater than those from the latter. System cluster analysis indicated that nine treatments combinations were classified into five ranks, of which best treatment combinations were A2B2 and A2B3, followed by A1B2 and A3B2. On the consideration of comprehensive analysis, the appropriate planting density and nitrogen rate of Qinyan 96 are 16 698 plant/hm2 and N 180 kg/hm2 respectively. Conclusively, to modify N rate and planting density could increase the use efficiency of fertilizer and enhance the yield and quality of flue-cured tobacco based on the interaction between them.
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Keywords:
- flue-cured tobacco /
- density /
- nitrogen /
- interaction /
- growth /
- output value
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