Physiological indicators and yield of the Chinese cabbage cultivated at different soil water tensions
Laen...
Kuupäev
2020
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The development and yield of Chinese cabbage is influenced by soil moisture. The
objective of this study was to evaluate the physiological indicators, development, and yield of
Chinese cabbage (Brassica rapa subsp. pekinensis (Lour.) Rupr.) grown at different soil water
tension ranges. Two experiments were conducted (2016–2017) in the Olericulture Sector of the
Federal University of Technology of Paraná. Two cultivars of the Chinese cabbage, Eikoo and
Kinjitsu, and four soil water tension ranges 13–17, 23–27, 33–37, and 43–47 kPa were studied.
Eikoo presented higher relative chlorophyll index, photosynthesis, and fresh leaf mass than did
Kinjitsu. Physiological indicators transpiration (5.8 mmol H2O m-2
s
-1
), photosynthesis
(14.5 µmol CO2 m-2
s
-1
), stomatal conductance (0.31 mol H2O m-2
s
-1
), and WUE (39.4 kg m-3
)
were higher at 13–17 kPa soil water tension. Soil water tension ranges with high water restrictions
reduced the fresh leaf mass of both cultivars. Fresh leaf mass decreased by 236.2 and
191.7 g plant-1
in the highest soil water tension range in 2016 and 2017, respectively, when
compared with the fresh leaf mass at the 13–17 kPa tension range. The lowest water consumption
was observed at the 13–17 kPa tension range. The year 2017 resulted in higher internal CO2
concentration, transpiration rate, fresh leaf mass, number of irrigations and water consumption
compared to the year 2016. Thus, the irrigation regime for the most optimal Chinese cabbage
cultivation should maintain the soil water tension range at 13–17 kPa.
Kirjeldus
Märksõnad
Brassica rapa, photosynthesis, soil moisture, tensiometer, yield, articles