Conclusions
The influence of mechanical soil resistance on shoot growth can be explained qualitatively by its influence on root morphology. When relating ion uptake quantitatively to a certain root parameter (length, surface area, weight), availability of nutrients in the different soil layers must be taken into consideration.
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Veen, B.W., Boone, F.R. The influence of mechanical resistance and phosphate supply on morphology and function of corn roots. Plant Soil 63, 77–81 (1981). https://doi.org/10.1007/BF02374260
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DOI: https://doi.org/10.1007/BF02374260