Effect of poplar canopy management on flower production in marigold
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Populus deltoides being a fast growing tree species attains a crown closure within 2-3 years
and crown size increases with advancement in the age. The crown plays an important role in
changing the microclimatic conditions such as humidity, temperature, light intensity, PAR
etc. which influences the physiological processes of the intercrops. To regulate the shade, it is
essential to prune the trees to minimize the competition for light between trees and intercrops.
In this study marigold was intercropped under poplar with different pruning treatments (50%,
75% and lateral pruning each with topping and no topping) and compared with control.
Results showed that PAR and Light intensity decreased under poplar canopyand was
observed maximum in the open (control). Temperature was highest in open and lowest under
the canopy, while relative humidity was more under the canopy than in open. Maximum
growth of marigold plant was observed in open, while among pruning treatments it was
maximum under 75% pruning with topping. Fresh flower yield was significantly higher in
open grown crop. Among the treatments fresh flower yield was highest in 75% pruning with
topping (60.78% less as compared to open) and was decreasing with the decrease in pruning
intensity. Pruning treatments have significant effect on the diameter at breast height in poplar.
Maximum increment in DBH was recorded in 50% pruning with topping (2.62 cm) as
compared to other treatments.
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