施氮量与密度对浏阳烤烟产质量的耦合效应

摘要

In order to investigate the coupling effects of nitrogen fertilizer rate and planting density on economic traits and chemical quality of flue -cured tobacco in Liuyang tobacco area,a field experiment with 3 nitrogen application rates,150 kg/hm2 (A1),180 kg/hm2 (A2)and 210 kg/hm2 (A3),and 3 planting densities,15 000 plant/hm2 (B1),16 500 plant/hm2 (B1)and 18 000 plant/hm2 (B1),were carried out.The results showed that (1)the yield and output value showed the increase -decrease trend with the increment of nitrogen application rate and planting density in this study,and the cou-pling effect of A2B2 and A2B3 was the best.(2)The physical characters of tobacco leaves were evidently affected by ni-trogen application rate and planting density,weight per leaf of A3B1 treatment was the biggest,and the stem ratios of A2B1 and A2B2 treatment was the lowest.(3)The appearance quality of cured tobacco leaves unclearly affected by density, while evidently affected by nitrogen application rate and appearance quality of A2 treatment was the best.(4)The chemi-cal components and its coordination of cured leaves were significantly affected by nitrogen application rate and planting density.Comprehensively considered nicotine,K content and coordination of chemical components,chemical quality of the middle leaves of A2B3 treatment was the best,and chemical quality of upper leaves of A2B2 treatment was the best.So the coupling effects of nitrogen 180 kg/hm2 and planting density 16 500 ~18000 plant/hm2 on yield,output value and leaves quality were the best.%为探讨施氮量与密度对浏阳烤烟经济性状与烟叶品质的耦合效应，在3个施氮量（A1：150 kg／hm2、A2：180 kg／hm2、A3：210 kg／hm2）和3个密度（B1：15000株／hm2、B2：16500株／hm2、B3：18000株／hm2）下开展了大田试验。结果表明：（1）本试验条件下，烟叶产量与产值均随施氮量和密度增大表现先增后降趋势，以 A2B2、A2B3处理对产量与产值的耦合效应最佳；（2）施氮量与密度明显影响烤后烟叶物理性状，A3B1处理单叶重最大，A2B1和 A2B2处理烟叶含梗率最低；（3）烤后烟叶外观质量受密度影响小，受施氮量影响较大，A2处理烤后烟叶外观质量最好；（4）施氮量与密度耦合对烤后烟叶化学成分及其协调性影响显著，综合烟碱、钾含量以及化学成分协调性指标，中部烟叶以 A2B3处理化学品质最好，上部烟叶以 A2B2处理化学品质最好。综合来看，施氮量180 kg／hm2和密度16500～18000株／hm2对浏阳烟区烤烟产量、产值和烟叶品质的耦合效应最佳。