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Seedling Test for the Quantitative Measurement of Root Tolerances to Compacted Soil¹

Root responses of plant genotypes to compacted soils have not been well defined. This experiment was conducted under controlled environments using a soil core seedling test consisting of an experimentally compacted soil having air-filled porosities of 31, 18, and 6%. Root penetration ratios were measured 14 days after planting without destroying seedling viability. Root penetration ratios and root lengths declined linearly with decreasing air-filled porosity. Xylem accumulations of toxic anaerobic metabolites were directly correlated with soil bulk density and inversely related to oxygen diffusion rates in the soil. High correlations (r = 0.91) were observed between root penetration ratios of this rapid test and the growth and yield of field-grown dry edible beans (Phaseolus vulgaris L.).

Key Words: Root penetration ratio • Phaseolus vulgaris L. • Soil bulk density • Soil Porosity • Xylem exudates

² Graduate research assistant and professors, respectively, Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824.

Received for publication September 4, 1984.

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