Microclimate modification in gobhi sarson (Brassica napus L.) by debranching and defoliation under different dates of sowing

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dc.contributor.advisorDhaliwal, L.K.
dc.contributor.authorHarinder Pal Singh
dc.date.accessioned2016-10-20T15:49:16Z
dc.date.available2016-10-20T15:49:16Z
dc.date.issued2014
dc.description.abstractThe experiment was conducted at the Research Farm, School of Climate Change and Agricultural Meteorology, Punjab Agricultural University, Ludhiana to study “Microclimate modification in gobhi sarson (Brassica napus L.) bydebranching and defoliation under different dates of sowing” during rabi season of 2013-14. The experiment was laid out in split plot design with three sowing dates (October 10, October 25 and November 10) and two varieties (GSC-6 and GSL-2) in main plots; and debranching and defoliation treatments along with the control in sub plots with three replications. The number of days taken for different phenological events of crop reduced with delay in sowing from 10th October to 10th November which shortened the vegetative and reproductive phase. The photosynthetically active radiation interception was higher in variety GSC-6 at pod formation and pod filling stages while at flowering stage, it was higher in variety GSL-2. In defoliation and debranching treatments PAR interception was increased by 4 to 7 per cent over control. The agrometeorological indices viz. growing degree days (GDD), photo-thermal units (PTU), helio-thermal units (HTU) were higher under 10th October sowing and decreased with each delay in sowing. The relative humidity was low under debranching and defoliation treatments. There was a slight increase in canopy temperature was also found under defoliation and debranching treatments over control. Crop sown in October recorded higher number of primary branches per plant, number of secondary branches per plant siliquae per plant, seeds per siliquae and test weight as compared to November sown crop. Varieties showed non-significant differences in all the above parameters except test-weight. Defoliation treatment recorded significantly higher number of secondary branches and siliquae per plant than debranching and control, however, significantly higher number of seeds per siliqua and test weight was recorded in debranching treatment over defoliation and control. Variety GSC-6 produced higher seed yield than GSL-2, with significant decrease in 10th November sown crop as compared to October sowing. Debranching produced significantly higher yield followed by defoliation and control in 10th and 25th October sown crop. However, November sown crop resulted in significantly lower seed yield in defoliation treatment, while debranching and control produced similar seed yield. The information from this study will help in management of microclimate through canopy modification and agronomic means, which could result in higher productivity of gobhi sarson. Moreover, the defoliation and debranching of gobhi sarson provides the fodder yield in addition to seed yield, which may compensate the labour cost involved in such practices.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/81145
dc.language.isoenen_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemMicroclimate modification in gobhi sarson (Brassica napus L.) by debranching and defoliation under different dates of sowingen_US
dc.subAgricultural Meteorologyen_US
dc.subjectAgricultural Meteorologyen_US
dc.subjectgobhi sarsonen_US
dc.subjectAgronomyen_US
dc.subjectPARen_US
dc.subjectBrassica napus L.en_US
dc.themeBrassica napus L.en_US
dc.titleMicroclimate modification in gobhi sarson (Brassica napus L.) by debranching and defoliation under different dates of sowingen_US
dc.typeThesisen_US
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