Participation of seminal roots in water uptake by the maize root system
1994
Navara, J. | Jesko, T. | Duchoslav, S. (Slovenska Akademia Vied, Bratislava (Slovakia). Botanicky Ustav)
The water uptake (WU) by seminal part (RS) and vegetative nodal part (RAN) of the maize (Zea mays, hybrid CE 330) root system was separately measured during growing season using compensation lysimetry. In average, WU by RS was observed to be 16.7 % of total plant water uptake during the growing season. The relative water uptake (WU in %) by RS has a decreasing tendency in total WU by plant, from 100 % plant WU in time of germination to about 10 % plant WU in early phase of grain feeding by assimilates. This general tendency was twice interrupted, 1st by preliminary increase of WU just before flowering, and 2nd and most expressively by increase of WU in time of cob increment. The rate of water uptake (RWU in ml.m** (-2).d** (-1) 1 deg C) was determined to be up to 6 times higher in RS than in RAN during the generative phase. RWU by RAN was positively correlated with changes of shoot:root surface ratio, while RWU by RS was positively correlated with the dry matter increment of cob.
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