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Root Development of Maize ( Zea mays L.) as Observed with Minirhizotrons in Lysimeters
Author(s) -
Liedgens Markus,
Soldati Alberto,
Stamp Peter,
Richner Walter
Publication year - 2000
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2000.4061665x
Subject(s) - biology , zea mays , pollen , lysimeter , root system , botany , crop , growing season , lateral root , agronomy , horticulture , soil water , ecology , biochemistry , arabidopsis , gene , mutant
Knowledge of root growth patterns is relevant for agronomic management practices. The growth of maize roots ( Zea mays L.) was studied by means of minirhizotrons in lysimeters. Ten minirhizotrons (60‐mm outer diameter) were placed horizontally at soil depths between 5 and 100 cm, perpendicular to the maize row. The root density (roots cm −2 ) on images (2.43 cm 2 ) was observed at weekly intervals. During the growing season, the root density increased to a maximum and then decreased, a pattern observed in 3 yr and at all depths and positions relative to the plant row. Growing degree days, compared with chronological time, did not improve the description of temporal root growth patterns. Maximum root density did not occur at the same time as pollen shed, in contrast to maximum leaf area. At shallow depths, the maximum root density was observed at the same time as pollen shed, while at a depth of 100 cm, the maximum root density occurred 2 wk after pollen shed. The maximum root density was observed about 10 d after pollen shed at most positions relative to the plant row. In conclusion, the maximum root density and hence resource uptake capacity of the root system was reached with some delay in relation to the vegetative development of the crop.