【摘要】 采用盆栽和大田相结合的办法,研究柴胡的氮磷钾吸收特性。结果表明,在大田条件下,柴胡对氮、磷、钾元素的需求量顺序为钾>氮>磷,一年生柴胡每生产100kg干根,需吸收N11.77kg、P2O52.43kg、K2O14.07kg;二年生柴胡每生产100kg干根,需吸收N12.11kg、P2O52.74kg、K2O18.39kg。一年生和两年生柴胡吸收的N∶P2O5∶K2O分别为4.89∶1∶5.85和4.31∶1∶6.55。第一年柴胡吸收的氮、磷、钾总量较少,但地上地下部的相对含量都较高,对养分需求较迫切,而第二年返青至拔节末期为植株氮、磷、钾素积累的高峰期。柴胡各生育期体内氮、磷、钾比例差异较大。更多还原

【Abstract】 It was studied that the characteristics of Bupleurum chinense DC. in nutrition uptake based on potted and field experiment to provide a properly fertilizer application measure. The result showed that the absorption amounts of N, P and K were in the order of K>N>P under field condition. For one-year-old B. chinesnse DC., the average N, P₂O₅ and K₂O absorption per 100kg dry matter of root were 11.77kg, 2.43kg, 14.07 kg respectively; for two-year-old, the average N, P₂O₅ and K₂O absorption amount per 100kg dry matter of root were 12.11kg, 2.74kg, 18.39 kg respectively. The total absorption amount of N, P₂O₅ and K₂O were lower in the first year, while the percentage of content was higher, that was to say, the demand for N, P and K was urgent in the first year. The accumulation peak of N, P₂O₅ and K₂O occurred regreening to later elongation stage in the second year. The ratio of N, P and K were differential in different growth stages.更多还原