caa a22 4500 477111998 CHVBK 20180405111611.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF00010990 doi (NATIONALLICENCE)springer-10.1007/BF00010990 Growth and morphology of eucalypt seedling-roots, in relation to soil strength arising from compaction [Elektronische Daten] [R. Misra, A. Gibbons] Information on the response of root growth and morphology to soil strength is useful for testing suitability of existing and new tillage methods and/or for selecting plants suitable for a specific site with or without tillage. Although there is extensive published information on the root growth-soil strength relationships for annual agricultural plants, such information is scarce for woody, perennial tree species. The purpose of this study is to examine growth and morphology of the root systems of 17-day-old eucalypt seedlings with respect to variation in soil strength. Soil strength in this study was varied by compaction of a well-aggregated clay soil to bulk densities of 0.7-1.0 Mg m-3 whilst maintaining adequate water availability and aeration for plant growth. Lengths and tip-diameters of primary and lateral roots were measured on the excavated root systems of seedlings. With increase in bulk density and also soil strength (expressed as penetrometer resistance), total length of primary and lateral roots decreased. There were 71 and 31% reduction in the lengths of primary and lateral roots respectively with an increase in penetrometer resistance from 0.4 to 4.2 MPa. This indicated primary roots to be more sensitive to high soil strength than the lateral roots. Average length of lateral roots and diameters of both primary and lateral root tips increased with an increase in soil strength as well. There was greater abundance of lateral roots (no. of lateral roots per unit length of primary root) and root hairs with increased soil strength. The observed root behaviour to variable soil strength is discussed in the context of compensatory growth of roots and overall growth of plants. Kluwer Academic Publishers, 1996 Eucalyptus nitens nationallicence lateral roots nationallicence penetrometer resistance nationallicence root diameter nationallicence root growth nationallicence soil strength nationallicence Misra R. Cooperative Research Centre for Temperate Hardwood Forestry, Locked Bag No. 2, Post Office, 7005, Sandy Bay Tasmania, Australia aut Gibbons A. Cooperative Research Centre for Temperate Hardwood Forestry, Locked Bag No. 2, Post Office, 7005, Sandy Bay Tasmania, Australia aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 182/1(1996-05-01), 1-11 0032-079X 182:1<1 1996 182 11104 https://doi.org/10.1007/BF00010990 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00010990 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Misra R. Cooperative Research Centre for Temperate Hardwood Forestry, Locked Bag No. 2, Post Office, 7005, Sandy Bay Tasmania, Australia aut NATIONALLICENCE 700 1- Gibbons A. Cooperative Research Centre for Temperate Hardwood Forestry, Locked Bag No. 2, Post Office, 7005, Sandy Bay Tasmania, Australia aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 182/1(1996-05-01), 1-11 0032-079X 182:1<1 1996 182 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer