不同氮磷钾施肥量对烤烟农艺性状及养分吸收的影响

研究氮磷钾用量对烟草生长和叶片养分吸收的影响,大田试验结果表明,不同水平的N、P、K施肥量明显影响烟株的长势,影响程度N>K>P,综合考虑产量和上等烟比例,以施肥量N 112.5 kg/hm2、P2O5112.46 kg/hm2、K2O 269.84 kg/hm2的N2P2K2处理最好,某种元素不足或过量都会降低上等烟比例。施用适量的氮有利于烤烟中N和K的吸收,而过量50%的N3水平的氮使烟草钾含量降低了11%。磷浓度过高或过低都会降低N和K的积累。增施K肥有利于N和K的积累,其中钾含量最高增长幅度可达37%。随着氮用量增加,上等级烟氮肥农学利用率呈直线下降的趋势,而磷、钾农学利用率在一定氮磷钾用量范围内增加。

Effect of NPK rate on growth,development and nutrient absorption of flue cured tobacco

The tobacco agronomic traits and N,P,K content of different treatment and tobacco yield,percentages of high quality leaves were studied.The results showed that different levels of N,P,K fertilization took effect on tobacco agronomic traits,the impact was N greater than K and greater than P,considering yield and high quality leaves,N2P2K2 was the best fertilization rate,the percentages of high quality leaves decreased whenever N,P or K lack or shortage.Application of appropriate nitrogen was in favor of N and K assimilate,whereas the K content decreased to the extent of 11% at N3 level.The N and K content also decreased at high or low P level.K and N content were improved to the highest extent of 37% as potassium fertilization increasing.With the more nitrogen applying,the nitrogen agronomy use efficiency of fine grade cured leaf decreasing distinctly,whereas phosphorus and potassium agronomy use efficiency increasing to a certain extent.