氮磷钾肥配施对甘草生物产量的肥效研究

通过田间小区试验，研究不同水平氮磷钾肥的配比施用对甘草地上、地下生物量的肥效.结果表明，不同水平氮磷钾肥的配比施用对甘草生物量有明显肥效，不同处理的肥效对比为：偏高肥水平（尿素140 kg/hm2、过磷酸钙200 kg/hm2、硫酸钾160 kg/hm2）＞中肥水平（尿素70 kg/hm2、过磷酸钙100 kg/hm2、硫酸钾80 kg/hm2）＞高肥水平（尿素280 kg/hm2、过磷酸钙400 kg/hm2、硫酸钾320 kg/hm2）≥低肥水平（尿素35 kg/hm2、过磷酸钙50 kg/hm2、硫酸钾40 kg/hm2）＞对照（CK）.所有指标在中肥水平处理和偏高肥水平处理中增加相对最为明显，比 CK 增加的比例为：株高74．43％和66．32％，茎干重55．43％和51．09％，复叶数100％和90．9％，叶干重88．11％和74．13％，根长8．64％和6．93％，根直径24．17％和23．63％，根干重21．47％和20．02％，根冠比48．15％和44．44％.

Application of N,P,K Fertilizers on Biomass of Glycyrrhiza uralensis Fisch

The effect of N,P,K fertilizers application rate on above ground and underground biomass of Glycyrrhiza uralensis Fisch was researched in a field plot experiment.The results showed that the fertiliz-er efficiency of N,P,K by comparison were sequenced as follows：slightly high fertilizer level （urea 140 kg/hm2 ,phosphate 200 kg/hm2 ,lemery 1 60 kg/hm2 ）〉 moderate fertilizer level （urea 70 kg/hm2 , phosphate 100 kg/hm2 ,lemery 80 kg/hm2 ）〉 high fertilizer level （urea 280 kg/hm2 ,phosphate 400 kg/hm2 ,lemery 320 kg/hm2 ）≥ low fertilizer level （urea 35 kg/hm2 ,phosphate 50 kg/hm2 ,lemery 40 kg/hm2 ）〉CK.The indexes of treatment with moderate fertilizer level and that of treatment with slight-ly high fertilizer level were increased significantly.Compared with CK,the proportion of increasing was as follows：plant height increased by 74.43% and 66.32%,the stem weight increased by 55.43% and 5 1.09%, leaf number increased by 100% and 90.9%,leaf weight increased by 88.1 1% and 74.13%,root length in-creased by 8.64% and 6.93%,root diameter increased by 24.17% and 23.63%,root weight increased by 21.47% and 20.02%,root top ratio increased by 48.15% and 44.44%.