Ram SinghMehnaj Tharranum, A.2016-11-162016-11-162009http://krishikosh.egranth.ac.in/handle/1/85896The study entitled ‘Agrometeorological responses of Brassica species under different growing environments’ was conducted at the research area of the Department of Agricultural meteorology, CCS Haryana Agricultural University, Hisar, during the rabi season of 2008-09. The main plot treatments consisted of three dates of sowing (15th October, 27th October and 10th November) and the sub-plots consisted of 10 varieties (Laxmi, RH30, Varuna, RH819, Kranti, GSL-1, HNS- 0501, 0004, 0403 and 0401). The thirty treatment combinations were tested in split plot design with three replications. The 15th October sown crop had highest thermal and radiation indices and TUE and RUE were also highest in this treatment as compared to 27th October and 10th November sown crops. The transmitted photosynthetically active radiation (TPAR) was recorded lowest in D1 as compared to D2 and D3 treatments. All growth parameters, yield and yield attributes were found highest in 15th October sown crop. The oil contents of D1 and D2 treatments were found highest and decreased with delay in sowing. The delay in sowing from 15th October to 27th October shortened the life cycle of the crop by 11 days and delay in sowing upto 10th November reduced the life span of the crop by 16 days. Among the varieties, Kranti and HNS-0403 took more number of days for completion of phenophases, in B. juncea and B. napus, respectively. Among the varieties of B. juncea, Kranti consumed highest HU and PTU, whereas RH30 consumed highest HTU. RH30 was found to utilize heat units and IPAR, efficiently. LAI, dry biomass and yield were also recorded highest in RH30. Among the genotypes of B. napus, HNS-0403 consumed highest HU, HTU and PTU. The efficiencies of heat and radiation utilization were highest in HNS-0004. LAI, dry biomass, IPAR and yield were recorded highest in HNS-0004, whereas, oil content was highest in HNS-0401. The correlation and regression analysis were carried out to study the relationship between agrometeorological and crop parameters. The weather parameters such as air temperature, relative humidity, sunshine hours and wind speed during 50 per cent flowering stage of the crop were better correlated with crop parameters, as compared to weather parameters during other stages. Morning relative humidity showed maximum negative correlation, whereas sunshine hours and air temperature showed maximum positive correlation with seed yield. All the thermal indices were positively correlated with crop parameters. Significant weather parameters such as maximum temperature and morning relative humidity explained the variability in yield up to 85 per cent. The agrometeorological indices (HU, HTU, PTU and IPAR) explained 83 per cent variability in seed yield of B. juncea. Replacing IPAR and including TUE and RUE in the above model, explained up to 62 per cent variability in seed yield of B. napus.enFarmyard manure, Yields, Fungi, Groundnuts, Sowing, Organic fertilizers, Foliar application, Planting, Diseases, RhizobiumThesis