Abstract
The effect of soil preparation on oat yield was investigated in two pot experiments involving several Quebec soils. The soils were used either untreated or were sieved after air-drying or at field moisture. Bulk density was higher for the soils sieved after air-drying, which generally gave the highest yields. When the soils were grouped as function of yield, it appeared that clay-rich soils low in organic matter were most susceptible to loss of structure and subsequently produced the lowest yield. A statistical analysis of the yields was conducted as a function of soil preparation and bulk density. The results suggest that in the case of experiments involving several soils, the method of soil preparation can induce or suppress differences that would be attributed to treatments.Key words: Soil preparation, bulk density and yield, soil disaggregation
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