烤烟漂浮育苗基质理化性状与出苗率的相关性  

Correlation Between Germination Rate of Flue-cured Tobacco Seed and Physical and Chemical Properties of Matrix in Floating System

作　　者：吴涛[1] 晋艳[1] 杨宇虹[1] 杨焕文[2] 

机构地区：[1]云南省烟草科学研究所 [2]云南农业大学烟草学院,昆明市北郊黑龙潭650201

出　　处：《烟草科技》2007年第8期43-47,51,共6页Tobacco Science & Technology

基　　金：云南省烟草公司资助项目"烤烟漂浮育苗基质替代原料开发及相关技术深化研究应用"(03A07)

摘　　要：研究了漂浮育苗基质的电导率、pH值、容重、1～5 mm粒径比例、有效铁与锰含量、吸持水量、比重、总孔隙度等理化性状对烤烟漂浮育苗出苗率的影响,并应用逐步回归法分析了基质理化性状与出苗率的相关性.结果表明：①试验测定的10项理化指标基本能反映育苗基质理化性状对出苗率的作用;②基质吸水性是影响出苗率的首要因素,其对出苗率的影响主要由直接效应决定,且该效应随着出苗过程的推进而不断增大;③基质的吸水性、容重、吸持水量和总孔隙度与出苗率存在正相关关系,相关性大小为：吸水性＞总孔隙度＞容重＞吸持水量;④电导率、pH值和有效锰含量与出苗率存在负相关关系,但三者对出苗率的影响在时间上有所差异.电导率对出苗率的负面影响主要发生在出苗过程的前期和中期,有效Mn含量主要是在出苗之初对出苗率产生影响,而pH值对出苗率的影响主要表现在出苗过程的中后期.The influences of different physical and chemical properties （conductivity, pH value, volume weight, 1 to 5mm particle diameter proportion, available Fe and Mn contents, absorptive and retainable water content, specific weight, and total porosity） of matrix in floating system on the germination rate of flue-cured tobacco seed were studied, and the correlation between germination rate and these properties were analyzed with stepwise regression, The results showed that： 1 ） the 10 tested factors could basically reflect the effects of physical and chemical properties of matrix on germination rate; 2） the hygroscopic property of matrix was the most important factor affecting germination rate, and its influence to germination rate mainly depended on direct effect, which gradually increased with the advance of germination; 3） hydroscopicity, volume weight, absorptive and retainable water content, total porosity positively correlated with germination rate, the order of degree of correlation was hydroscopicity 〉 total porosity 〉 volume weight 〉 absorptive and retainable water content; 4） conductivity, pH value and available Mn cOntent negatively correlated with germination rate, while these factors affected germination rate at different time, conductivity before and in the middle of germination, pH value at the beginning of germination, and available Mn in the middle and late of germination.

关 键 词：烤烟 漂浮育苗 基质 理化性状 出苗率 相关分析 回归分析 

分 类 号：S572.043[农业科学—烟草工业]