The influence of weather conditions on the sap flow of Brassica napus L. during the fructification and maturation stages
2009
Pivec, J., Czech University of Life Sciences, Prague (Czech Republic) | Brant, V., Czech University of Life Sciences, Prague (Czech Republic) | Bečka, D., Czech University of Life Sciences, Prague (Czech Republic)
Transpiration of arable crops is one of the basic components of their water balance. The sap flow in Brassica napus L. plants (Q; kg per ha) was measured in fields in central Bohemia during the vegetation period in 2005. The selected measuring interval was that from the pod formation stage to the maturation stage. Q was observed using a sap flow meter T 4.2 (EMS, Brno). The decrease in actual Q values after BBCH 84 phase accession was documented by means of the calculated Q sub(calc) values, which were estimated from the photosynthetic active radiation and the vapor pressure deficit values. The average daily Q value of a single B. napus plant achieved 0.33 kg per day within the BBCH 78-83 phase. Within the BBCH 84-89 phase, the average daily Q value was only 0.09 kg per day. The average water consumption of the whole plant cover was 2.8 mm for 51 plants per square m.
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