尿素和磷酸二氢钾对红蓝石蒜生长的影响

探讨了施用不同水平的尿素和磷酸二氢钾对红蓝石蒜Lycoris haywardii当季和翌年生长季叶片生长状况及鳞茎生物量的影响,并对叶量进行主观评价.结果表明:高用量施用尿素对红蓝石蒜叶片数量、叶片长度、芽数、鳞茎数量以及鳞茎生物量等均产生了显著的负面影响；红蓝石蒜对磷酸二氢钾的耐受性良好,高用量施用对当年生叶片数量有显著的促进作用,但翌年影响不明显;叶片数量与鳞茎生物量呈线性相关关系,与主观评价定性结果相一致,可以利用主观评价法估计鳞茎的生物量动态变化,实时掌握施肥对鳞茎产量的影响效果.

Lycoris haywardii growth with carbamide and KH2PO4 treatments

To study the effects of carbamide and KH2PO4 as fertilizer on leaf growth and bulb biomass of Lycoris haywardii over two successive growing seasons,an experiment with a two-factor design of four different carbamide and KH2PO4 application levels（carbamide at 0,0.5,1.0 and 1.5 kg·m-2;KH2PO4 at 0,0.35,0.70 and 1.05 kg·m-2） as a topdressing fertilizer and three repetitions was established.Data were analyzed with SSPS16.0.Results showed that carbamide applications（0.5 kg·m-2） had a significant（P0.05） negative effect on leaf number,sprout number,bulb number and bulb biomass in the next growing season,and leaf length in the following growing season.The KH2PO4 treatment at 0.35 kg·m-2 in the following growing season significantly increased the leaf count（P0.05）.Leaf quantity was linearly and positively related to the bulb biomass（linear regression;r=0.941,P=0.000） and was similar to qualitative results from subjective evaluations.So,subjective evaluation could be used to estimate live-weight trends for bulb biomass and to evaluate growth effects of L.haywardii with fertilization.