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Das Penetrationsvermögen von Wurzeln unterschiedlicher Roggen‐ und Triticalegenotypen in Abhangigkeit von der Bodenlagerungsdichte
Author(s) -
Dannowski M.
Publication year - 1992
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1992.tb00995.x
Subject(s) - triticale , loam , agronomy , bulk density , clay soil , mathematics , silt , biology , horticulture , soil water , ecology , paleontology
The penetration capability of different rye and triticale varieties in dependence on the soil bulk density By means of a laboratory test the primary roots of 9 rye and 4 triticale varieties were tested for their capability of penetrating overcompactions. The roots served as “natural probes” and as a mark of genotypic differences. The test was carried out in the stages 1.50, 1.65 and 1.80 g/cm 3 of soil bulk density. The soil substrate (faint loamy sand) consisted of 5.4 % of clay, 13.8 % of silt, 80.8 % of sand and 0.6 % of total C t . The tested corn roots respond to compacted soil structures with considerable differences in the rootability. These level differences are not only specific marks for species but also for varieties within the species. Though most of the tested corn varieties respond with restricted root growth in compacted soil, the results cause the expectation that single varieties have a good adaptability to overcompacted soil and can tolerate it better than other ones. At the specific bulk density limit of faint loamy sand (1.50 g/cm 3 ) all tested varieties have an intensive root growth. The rootability of triticale varieties is clearly reduced at the bulk density of 1.65 g/cm 3 ; the roots of rye varieties, however, grow without essential restrictions in this range. Against all expectations the root growth of single rye varieties is similarly intensive as in loose soil at the bulk density of 1.80 g/cm 3 . Other rye varieties respond very sensitively and with considerable restrictions in root growth in this range. Since a characteristic increase of roots' diameter is to be observed with increasing bulk density, no differences in the root dry matter, caused by bulk density, can be found out. The applied experimental method permits a first selection of plant varieties, which could be interesting in future in view of the mark “Penetration performanc” of primary roots.