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Subject: Agricultural Meteorology × Author: Brar, Sunwinderpal Singh × End date: 2019 × Start date: 2014 × Type: Thesis ×
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    Growth dynamics of mustard (Brassica napus) cultivars under modified microclimatic environments
    (Punjab Agricultural University, Ludhiana, 2014) Brar, Sunwinderpal Singh; Sidhu, Prabhjyoti Kaur
    The field experiment entitled “Growth dynamics of mustard (Brassica napus) cultivars under modified microclimatic environments” was carried out at the Research Farm, School of Climate Change and Agricultural Meteorology, Punjab Agricultural University, Ludhiana during the Rabi 2012-13. Field experimentation on Brassica napus cultivars (GSC-6 and Hyolla PAC 401), comprising of two spacings (30 cm and 45 cm) and three dates of sowing i.e., D1 (26 October, 2012), D2 (10 November, 2012) and D3 (27 November, 2012) was planned in split plot design and replicated thrice. Three dates of sowing and two cultivars were assigned as main plot treatments and two spacing levels as sub plot treatments. The results revealed that the solar radiation (SR) interception and photosynthetically active radiation (PAR) interception was higher under the first date of sowing and in cv. Hyolla PAC 401. Similarly the SR and PAR interception was higher under closer row spacing (30 cm) due to taller plant height. Canopy temperature and relative humidity was slightly higher under first and third date of sowing. With delay in sowing, the reduction in days taken by phenological events of crop leads to shortening of vegetative and reproductive growth stage of crop and cv. GSC-6 took 7, 5 and 9 days less number of days to attain physiological maturity as compared to cv. Hyolla PAC 401 under first, second and third date of sowing, respectively. Periodic plant height and dry matter accumulation was found higher under first date of sowing as well in closer row spacing (30 cm). Leaf area index (LAI) was higher under first date of sowing and crop sown with closer row-spacing (30 cm) and in cv. Hyolla PAC 401. Amongst the yield attributes characters, first date of sowing crop produced higher number of branches, number of seeds/pod and 1000-seed weight. Both the cv. showed non-significant effect on number of branches, seeds/pod and 1000-seed weight. Whereas closer row spacing (30 cm) produced higher number of branches/plant, number of seeds/pod and 1000-seed weight as compared to wider row spacing (45 cm). The pod yield, seed yield, biological yield and straw yield were significantly higher under the first sown crop and in closer row spacing (30 cm). The agro climatic indices GDD, PTU, HTU and HUE attained were more under first date of sowing and were accrued more by cv. Hyolla PAC 401 as compared to cv. GSC-6 under all three date of sowing. The growth parameters like CGR, RGR, LAD, SLW and NAR showed increasing trend, i.e., increased with advancement in sowing from November to October. On the other hand, LAR and SLA showed reverse trend, i.e., increased with delay in sowing from October to November.