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Untersuchungen zum Wurzelwachstum von Jungpflanzen alter und neuer Winterweizensorten sowie eines Spelzweizens bei variierter N‐Versorgung
Author(s) -
Feil B.,
Geisler G.
Publication year - 1988
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.1988.tb00666.x
Subject(s) - cultivar , shoot , dry matter , horticulture , biology , dry weight , winter wheat , sowing , agronomy
Root growth of seedlings of old and new winter wheat cultivars and a spelt wheat at varying levels of nitrogen Root growth of five old (time period 1882–1920) and five new (time period 1975–1982) winter wheal cultivars and a spelt winter wheat cultivar was investigated in two greenhouse trials. Nitrogen (NH 4 NO 3 ) was supplied at six (Exp. I) and two (Exp. II) levels (sub‐ to supraoptimal for shoot growth). The seedlings were grown in sand‐filled polyethylene tubes of 4.5 cm diameter and 50 cm length at 20 o C. The plants were harvested 11 (Exp. I) and 12 (Exp. II) days after emergence. At this early stage of development root growth o: old and new cultivars differed only slightly. The old T. aestivum cultivars had more seminal roots. The longest roots of the modern cultivars penetrated into deeper layers of the substrate. For some traits, cultivar: seemed to respond specifically to the varying N‐supply. However, there were no significant difference: between old and new cultivars. Neither were old cultivars better adapted to low N‐fertilization nor were modern cultivars superior in tolerating toxic concentrations of NH 4 NO 3 . Increasing N supply changes root growth as follows: decline in root dry matter, increase in shoot/root ratio of dry weight, decrease in number of seminal roots, shortening of axes and more laterals, increase in diameter of the laterals and less significantly of the main roots, increase in density of laterals, decline in root surface area. The number of apices was affected only to a very small degree.