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 3414mixed 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 500kg·ha-1,which increased 39.3% compared to the control.It was recommended that nitrogen application should be 171kg·ha-1,phosphorus application should be 292.5kg·ha-1 and potassium application should be 49.5kg·ha-1 in practice.