Effect of poplar-based microclimate on intercultivation of onion
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
The present study entitled ‘Effect of poplar-based microclimate on intercultivation of onion’
was carried out at main research area of the Department of Forestry and Natural Resources,
Punjab Agricultural University, Ludhiana during the year 2016-2017 and 2017-18. The study
was carried out to optimize the planting time of different onion varieties under poplar
plantation. An experiment was laid out during three planting times viz. end-December, mid-
January and end-January with the four onion varieties viz. Pb-Naroya, PRO-6, PWO-35 and
PRSC-10. The experiment was laid out in split-split plot design with the two environments as
main plot, three times of planting as sub-plot and four onion varieties as sub-sub plot. Various
growth and yield parameters were recorded for both trees and crops. The onion crop showed
positive effect on the tree growth parameters such as tree height, diameter at breast height and
crown spread. The average temperature was recorded higher under open conditions as
compared to poplar plantation whereas relative humidity was recorded higher under poplar
plantation as compared to under open conditions. The average total bulb yield was recorded
higher under two-year-old plantation (188 q/ha) as compared to the bulb yield under threeyear-
old plantation (175.5 q/ha). The average total bulb yield was recorded higher under open
conditions (222.5 q/ha) as compared to poplar plantation (128.5 q/ha). Under open conditions,
the mean bulb yield of end-December planted crop (253.1 q/ha) was significantly higher than
the mid-January (235.8 q/ha) and end-January (194.5 q/ha) planted crop. Among the varieties,
the mean bulb yield was found maximum in PWO-35 (259.5 q/ha) which was followed by
Pb-Naroya (235.8 q/ha), PRO-6 (223.6 q/ha) and PRSC-10 (192.4 q/ha). Under poplar
plantation parameters viz. number of leaves, plant height, weight of plant before and after
curing, average fresh bulb weight, dry matter content and TSS content was recorded
maximum in the end-December planted crop which was followed by mid-January and end-
January planted crop. Among the varieties, PWO-35 variety performed much better than the
other three varieties. Overall, the best combination of planting time and variety in the present
study was observed to be end-December planting time and PWO-35 variety.
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