氮磷钾配施对甘草生长动态和产量的影响

为研究氮磷钾配施对甘草(Glycyrrhiza uralensi)生长动态和产量的影响，对其进行“3414”氮磷钾配施试验。结果表明，氮、磷、钾配施对株高的促进效应主要表现在6月下旬之前的主茎快速生长期，对根干质量增加效应则主要表现在7―8月根粗和根长增加高峰期;中等水平氮(N2)、磷(P2)、钾(K2)对甘草生物量和产量促进效应最大;氮磷钾配施以N2P2K2时甘草产量最高，达6 500 kg·hm-2，较不施肥增产39.3%。推荐施氮量171 kg·hm-2，施磷量292.5 kg·hm-2，施钾量49.5 kg·hm-2。

Effects of nitrogen phosphorus and potassium mixed fertilizer application on growth dynamics and yield of Glycyrrhiza uralensis

To study the influence of nitrogen phosphorus and potassium mixed fertilizer application on yield and growth dynamics of Glycyrrhiza uralensis,the “3414” mixed fertilizer application were used on G.uralensis,the accumulation of biomass and dry matter accumulation were investigated.The results indicated that the increase effect of NPK mixed fertilizer on plant height was mainly in late June before main stem fast growth period,the increase effect on root dry weight was mainly in July-August,root diameter and root length reached high peak.The middle level of N(N2) with middle level of PK(P2,K2) can increase accumulation of biomass,fertilizer efficiency decreased without N,P,K; N2P2K2 was the highest yield for 6 500 kg·ha-1,which increased 39.3% compared to the control.It was recommended that nitrogen application should be 171 kg·ha-1,phosphorus application should be 292.5kg·ha-1 and potassium application should be 49.5 kg·ha-1 in practice.