A procedure for determining air and water capacity of soilless media and a method for presenting the results for easier interpretations
1980
Goh, K.M. (Lincoln Coll., Canterbury (New Zealand). Dept. of Soil Science) | Maas, E.F. (Agriculture Canada, Agassiz, BC (Canada). Research Station)
A method is described for the simultaneous determination of the air and water capacity of soilless media. In this method a separate tension funnel is used for each sample. Each funnel is filled with a plaster of Paris - sand mixture and it is connected to the manifold of a tension apparatus in which the tensions are varied using a jack device and water reservoirs. The method is highly reproducible as is evident from an overall mean coefficient of variation of 5.95 per cent (range of 2. 21 to 10. 69 per cent) and an overall mean standard error of means of 0. 55 (2. 40 per cent of grand mean) and a range of 0. 31 to 0. 84 (0. 97 to 5. 34 per cent of grand mean). The cited statistical estimates were obtained from an experiment using fir sawdust and fir sawdust: fine peat mixtures. The results from the experiemnt are also presented by a method which allows easier interpretation with direct reading from water release curve values of air and water capacity of soilless media. In this method water release curves are plotted with the 10 cm tension as the base line for zero water content and zero air space
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