施氮量和密度对浏阳烤烟农艺性状与经济性状的耦合效应

以烤烟品种G80为材料,在浏阳烟区研究了施肥量与种植密度对烤烟农艺性状和经济性状的耦合效应。结果表明:烤烟全生育期因施氮量增加而延长5~7 d,随密度增加而略有缩短3~4 d,即低氮高密处理全生育期最短;烤烟农艺性状因施氮量增大与密度降低而有所改善;试验条件下,以施氮量180 kg/hm~2和密度16 500~18 000株/hm~2的耦合效应最佳,产量分别为2 383.5与2 364.0 kg/hm~2,增产12.9%~52.3%与12.0%~51.0%;产值分别为63 043.5与62 622.3元/hm~2,增值11.7%~53.7%与10.9%~52.7%。

Coupling Effects of Nitrogen Application Rate and Planting Density on Agronomic and Economic Characters of Flue-cured Tobacco

With flue-cured tobacco variety G80 as material, the coupling effects of nitrogen application rate and planting density on agronomic and economic characters of flue-cured tobacco in Liuyang tobacco area was studied. The results showed that the whole growth duration of flue-cured tobacco was prolonged 5-7days by increment of N rate and shortened 3-4 days by increment of density, that was to say, the whole growth duration in low N and high density treatment was the shortest. The agronomic characters of flue-cured tobacco were improved due to the increase of nitrogen application rate and the decrease of the density; under the experimental conditions, the coupling effect of nitrogen application rate of 180 kg/hm2 and density 165 00-180 00 plants/hm2 was the best, the yield reached to 2 383.5 kg/hm2 and 2 364.0 kg/hm2 respectively, which was increased by 12.9%-52.3% and 12.0%-51.0% respectively; the output value is 63 043.5 and 626 22.3 yuan/hm2(RMB), value added 11.7%-53.7% and 10.9%-52.7%.