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Basu S.,Bidhan Chandra Krishi Viswavidyalaya | Parya M.,Bidhan Chandra Krishi Viswavidyalaya | Dutta S.K.,Bihar Agriculture University | Maji S.,Bidhan Chandra Krishi Viswavidyalaya | And 3 more authors.
Indian Journal of Agricultural Research | Year: 2014

Temperature change with concomitant change in canopy temperature influences crop growth and productivity. A three year (2005-06 to 2007-08) experiment was carried on wheat varieties PBW 343, HD 2733, HW 2045, PB 533 and K9107 in subplot treatments sown on three dates of 18th November, 3rd and 18th December in main-plot treatments in a split-plot design with three replications. Canopy temperature was measured at CRI, tillering, flowering and milking and stress degree day index was computed. Late sown crop experienced highest canopy temperature, varieties of K 9107 and HW 2045 recorded lowest and highest respectively. Canopy temperature and stress degree day index significantly and negatively correlated to dry matter accumulation in leaf, stem and ear at different phenophases. Grain yield reduce significantly with the delay in sowing. Canopy temperature at 11.30h during CRI, tillering or flowering stages significantly and negatively affected grain yield.


Basu S.,Bidhan Chandra Krishi Viswavidyalaya | Maji S.,Bidhan Chandra Krishi Viswavidyalaya | Dutta S.K.,Bihar Agriculture University | Jena S.,Odisha University of Agriculture and Technology | And 2 more authors.
Journal of Food, Agriculture and Environment | Year: 2014

The main rice-growing season in Eastern India spans from July-October. The average productivity is low because of cloudiness during the season. Interception of photosynthetically active radiation (PAR) by the crop at the different time points of a day plays a significant role in biomass accumulation, which is ultimately translated into yield. The effect of radiation has been investigated but the impact of different time-point has not been discussed in the literatures. To identify the congenial time point for PAR interception, an experiment was carried out for two years (2007 and 2008) on rice [variety IET-4786 (Satabdi)], which was transplanted during a period of 1stto 29thJuly having one week interval. The experiment was conducted at the B.C.K.V Research Farm (22°56'N and 88°32'E) in a randomised block design with four replications having a plot size of 30 m2. The PAR interception was measured at 7.30, 9.30, 11.30, 13.30 and 15.30 h during tillering, panicle initiation, flower emergence and 100% flowering stages. The total dry matter accumulation and leaf area index (LAI) were measured at these same growth stages. The mean interception was maximum at 100% flowering and minimum at the tillering stage; interception by the rice crop declined gradually after 15thJuly transplanting. Maximum dry matter accumulation was observed at 100% flowering. About 88, 92,73 and 97% variations in dry matter accumulation were explained by PAR interception at 13.30 h under 1st, 8th, 22ndand 29thJuly transplanted rice; whereas, 73% variation in dry matter accumulation could be explained through the variation in interception of PAR under 15th July transplanted crop. It was observed that the interception during early morning and afternoon played a significant role in biomass production. In case of late-planted crop, interception almost throughout the day played a regulatory role in dry matter production. The LAI increased gradually and the maximum LAI was recorded at 100% flowering. Delay in transplanting reduced the LAI. PAR interception increased significantly with the increment in LAI; the strength of relationship declined beyond 15thJuly transplanting. The results suggested that the rice should not be transplanted beyond 15thof July depending on PAR interception by the crop. © 2014, World Food Ltd. and WFL Publishers. All rights reserved.


Kumar P.,Bihar Agricultural University | Sangwan M.S.,CCS Haryana Agricultural University | Mehta N.,CCS Haryana Agricultural University | Kumar S.,Bihar Agriculture University
Journal of Environmental Biology | Year: 2014

Ascochyta blight caused by Ascochyta rabiei (Pass.) Labrousse is a major biotic constraint in production of chickpea. In the present investigation, all chickpea genotypes [E100Y (m), Gaurav, Pb-7 and L550] induced 100% callus on standard medium with greenish colour and fragile structure. These calli were used for in vitro screening against pathogen, A. rabiei culture filtrate at 0, 5, 10, 15 and 20% concentrations. Survival rate of calli in all chickpea's genotypes were reduced significantly at higher concentration (15%) of culture filtrate. The culture filtrate concentration of 20 % was lethal for calli of all chickpea's genotypes. Hence, biochemical changes viz. total soluble proteins and activities of anti-oxidative enzymes (polyphenol oxidase, peroxidase and catalase) were estimated at 15% and below concentration of culture filtrate. Tolerant calli of resistant genotype, E100 Y (m) revealed significantly higher total soluble proteins (10.04 mg g-1 f.wt. of callus) and activity of anti-oxidative enzymes, polyphenol oxidase (9.0 unit absorbance change min-1 mg-1 protein) and peroxidase (19.09 unit absorbance change min-1 mg-1 protein) and lower catalase (18.65 μ moles of H 2O2 utilized min-1 mg-1 protein) at higher (15%) concentration of culture filtrate followed by moderately resistant (Gaurav), and susceptible genotypes (Pb-7 and L550). Thus, higher polyphenol oxidase and peroxidase and lower catalase activity in chickpea's genotypes against culture filtrate of A. rabiei could be used as parameters for screening resistant genotypes to pathogen, A. rabiei. © Triveni Enterprises, Lucknow (India).


Bharti S.K.,Patna University | Krishnan S.,Magadh University | Kumar A.,Jawaharlal Nehru University | Rajak K.K.,Indian Veterinary Research Institute | And 4 more authors.
Phytomedicine | Year: 2012

The antidiabetic actions of Castanospermum australe Cunn., seed (CAS) extract were evaluated in Poloxamer-407 (PX-407) induced T2DM rats. The CAS extract (100 and 150 mg/kg body weight) was administered orally once a day for 5 weeks after the animals were confirmed diabetic. A significant increase in blood glucose, HbA1c and serum insulin levels were observed in T2DM rats in comparison to citrate control rats. Treatment with CAS extract in T2DM rats reduced the elevated levels of blood glucose, HbA1c and insulin with significant (p ≤ 0.001) improvement in OGT. The CAS extract treatment also increased (p ≤ 0.001) the KITT and prevented increase in HOMA-R level in T2DM rats. The DPP-IV inhibitory potential of CAS extract showed IC50 value of 13.96 μg/ml whilst the standard Diprotin A displayed the IC50 value of 1.543 μg/ml. Molecular docking of the three reported alkaloids from the seeds of C. australe showed comparable DPP-IV inhibition with berberine. Our data suggest that CAS extract (150 mg/kg body weight) normalizes hyperglycemia in T2DM rats with strong DPP-IV inhibitory potential. The molecular docking showed that among the three alkaloids of seed extract 7-Deoxy-6-epi-castanospermine is a potent DPP-IV inhibitor similar to berberine. © 2012 Elsevier GmbH.

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