人参的土壤营养与培肥研究 Ⅳ.用15N示踪研究人参对NH4+—N和NO3-—N的相对吸收利用

STUDY ON THE RELATIVE ABSORPTION OF NH4—N AND NO3—N BY GINSENG USING 15N AS A TRACER

摘要:

用¹⁵N示踪研究证明，二、三年生人参植株中，来自NH₄—N占全N百分数（Ndffa），分别相当于NO₃—N Ndffa的67.4和61.2％;NH₄—N的利用率，分别为NO₃—N利用率53.4和52.0％，后者明显优于前者。NO₃—N的Ndffn，两种年生人参，分别为豆饼—N的142.1和167.7％;利用率则分别为豆饼—N的120和119％，无机N显然更易被吸收。人参的营养生理特性，与多数旱田作物类似。

Abstract:

To study the relative absorption of NH₄-N and NO₃-N by ginseng, pot experiment with ¹⁵N as a tracer was carried out. The result showed that the Ndfa% (the percentage of N derived from NH₄) in 2 and 3 years old ginseng was only 67.4% and 61.2% of Ndfn% (the percentage of N derived from NO₃) meanwhile the utilization rate of NH₄-N was 53.4% and 52.0% of that pof NO₃-N. Thus the NO₃-N was absorbed more favourably than NH₄-N. However,it was also shown that 2 and 8 years old ginseng obsorbed the Ndfn% of NO₃-N as many as 142.1% and 167.7% of the percent of N derived from bean-cake powder respectively, and the utilization rate was 120% and 119% of that of the latter source. Therefore the inorganic nitrogen can easily be absorbed by ginseng. From the fact of relative absorption of NO₃-Nand NH₄-N,it was evident that the nutritional chraacteristic of ginseng was similar toordinary farming crops.