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Modification of Root‐Shoot‐Ratio of Sunflower ( Helianthus annuus, L. ) by Nitrogen Supply and a Triazole‐Type Plant Growth Regulator
Author(s) -
Kuchenbuch Rolf,
Weigelt Wolfgang,
Jung Johannes
Publication year - 1988
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19881510608
Subject(s) - helianthus annuus , shoot , sunflower , agronomy , growth regulator , biology , nitrogen , plant growth , horticulture , chemistry , organic chemistry
A factorial nutrient solution experiment with 3 N levels and 4 plant growth regulator (PGR) rates with sunflower ( Helianthus annuus , L., cv. Sorex) was conducted to investigate the effect of both variables on shoot and root development. Nitrogen shortage resulted in reduced shoot and root growth throughout the experiment, but root growth was less affected than the shoot PGR treatments drastically reduced shoot biomass production. Root growth was promoted. Both reduced nitrogen supply and application of a triazole plant growth regulator (BAS 111. W) increased the proportion of roots relative to the shoot.