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为了研究不同原料配合比例对基质水分物理性质的影响,用压力膜法和土柱法测定了18种栽培基质的不同水吸力下的基质持水量及速效水含量,及不同处理的基质容重、总孔隙度、毛管孔隙度、毛管水上升高度、渗透速率等水分物理指标,用单因子及互作逐步回归方法分析了蛭石、河沙及锯末三种原料不同配比对以上水分指标的影响。结果表明原料的组成与配比对无土栽培基质的各项水分参数有密切的相关性,原料配比对水分参数的影响可以用回归方程的形式量化和表达。
In order to study the effect of different raw materials proportion on the physical properties of matrix water, the matrix water holding capacity and available water content under different water suction of 18 kinds of culture substrates were measured by pressure membrane method and soil column method, Porosity, capillary porosity, ascendency of capillary water, infiltration rate and other physical indicators of water content. The effects of different proportions of vermiculite, river sand and sawdust on the above water indices were analyzed by single factor and stepwise regression method. The results showed that the composition and proportion of raw materials were closely related to the moisture parameters of soilless culture medium. The effect of raw material ratio on water parameters could be quantified and expressed by the regression equation.