三种原料对栽培基质含水量影响的统计分析

用砂、锯末和蛭石作为原料配制栽培基质,用压力膜装置测定了18个处理的水分含量,对各原料含量与基质水分含量进行逐步回归分析,建立回归方程。分析了原料含量对基质水分含量的影响,结果表明砂含量与基质水分含量之间呈显著的负相关;锯末及蛭石含量与基质水分含量呈正相关。3种原料对基质水分含量有较高的正直接作用,原料中的任何一种通过另外两种对基质水分量都是负间接作用。各回归分析的决定系数值都>0.80000,回归方程的相关系数R>0.890000,说明建立的回归模型有效,可靠,精度较高。

THE STATISTICAL ANALYSIS OF EFFECTS OF THREE RAW MATERIALS OF A CULTURE MEDIUM ON ITS WATER CONTENT

For the purpose of studying effects of raw materials of a culture medium on its water content sand, sawdust and vermiculite were used at different ratios to blend into culture media. Water contents of the media were determined by the pressure membrane method. Stepwise regression analysis was done between the three raw materials and water contents of the media, and a regression equation was erected. Effects of the raw materials on water content were analyzed. The results showed that sand content had a significant inverse correlation with the water content; sawdust and vermiculite contents had a positive correlation with the water content. The three raw materials had a quite high positive direct effect on the water content of the medium, and each raw material had a positive indirect effect on the water content of the medium through the other two materials. Decisive coefficients were all higher than 0.80000, and the correlation coefficient R >0.890000; which shows that the regression model was effective, reliable, and fairly precise.