Effect of planting scheme on photosynthetic activity and dry matter accumulation in apple leaves
Laen...
Kuupäev
2020
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
This study aims to identify changes photosynthetic rate and dry matter accumulation
in apple leaves with decreasing plant to plant distance of the trees. Apple tree Auksis' was grafted
on dwaring P60 rootstock and planted at different in distances: 0.5 m, 0.75 m, I m and 1.25 m
between plant to plant distance in rows. Photosynthetic indices were measured at 1.00-1.20 m
above ground inside the canopy. 20 randomly selected leaves from the whole apple tree canopy
were used to determine leaf area, fresh and dry weight. Measurements were made in three
different stages in May, June and September. By decreasing the distance between apple trees irom
1.5 m to 0.5 m, photosynthetic rate decreases correspondingly, decreasing by 23% in spring, and
decreasing by 31% in autumn. Distance between trees has no significant impact on leave
mass per area (LMA), however in spring is higher by 33-51% compared to summer and 42-78%
compared to autumn. Dry and fresh weight ratio (DW/FW) significantly increased in summer
by 27%% and in autumn - by 37% compared to spring, also DW/W significantly decreased by the
decreasing distance from 1.5 m to 0.5 m by 4-6%. In summary, the decreasing distance reduces
the photosynthetic rate, the accumulation of dry matter. Also, photosynthetic rate decreases from
spring to harvest time, and on the contrary, the accumulation of dry matter increases as autumn
approaches. After evaluating the obtained results, the aim is to further delve into the use and
transpiration of water and the impact of the planting scheme on fruit quality.
Kirjeldus
Märksõnad
photosinthetic rate, competitive stress, Malus domestica, dry matter, Lithuania, articles