Root-growth Inhibition Effects of Holorganic Moder Humus Layer Under Spruce (picea-abies Karst) and Beech (fagus-sylvatica L) .1. Field Observations and Growth Chamber Experiments

Weissen, Francois;Vanpraag, HJ.
(1991) Plant and Soil : international journal on plant-soil relationships — Vol. 135, n° 2, p. 167-174 (1991)

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  • Weissen, FrancoisUCLouvain
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  • Vanpraag, HJ.
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Abstract
Field observations demonstrated inhibition of root growth by moder humus material of the Of2 and Oh-layers under beech and spruce. Growth chamber experiments with spruce seedlings showed that root growth on a natural Of2-substrate is ten times lower than on resin-quartz mixtures. Added phenolic acid (protocatechic a.) inhibited root growth only in sterilized substrate. Leachates of Of2-material inhibited root growth in a mineral substrate devoid of absorption complex (pure quartz sand), but not in a resin-quartz mixture. It is concluded that inhibiting substances are probably ionized molecules that can withstand biodegradation.
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Weissen, F., & Vanpraag, HJ. (1991). Root-growth Inhibition Effects of Holorganic Moder Humus Layer Under Spruce (picea-abies Karst) and Beech (fagus-sylvatica L) .1. Field Observations and Growth Chamber Experiments. Plant and Soil : international journal on plant-soil relationships, 135(2), 167-174. https://doi.org/10.1007/BF00010904 (Original work published 1991)