Analysis of relationship between crop growth parameters,yield and physical environment within the crop canopy of sesame (Sesamum Indicum) at different sowing dates: Untersuchung der beziehungen zwischen wachstumsparametern,ertrag und physischer umwelt im pflanzenbestand von sesam (Sesamum Indicum) bei verschiedenen aussaatterminen     

R Nath  PK Chakraborty  P Bandopadhyay  CK Kundu  A Chakraborty 《Archives of Agronomy and Soil Science》2013,59(6):677-682

Relation between crop growth parameters of sesame (Sesamum indicum) and the physical environment within the crop canopy at different sowing dates was studied during the summer seasons of 1999 and 2000. The maximum leaf growth rate (LGR) and leaf area index (LAI) was obtained from February 19 sown crop. About 34.4% variation in LGR could be explained through the variation in the physical environmental elements within the crop canopy. The LAI was depressed in the later months of sowing. The February 19 sown crop produced significantly, the highest dry matter production (DMP) in all the stages of crop growth. The regression model indicated that the crop growth rate (CGR) was adversely affected by the ambient temperature and photosynthetic active radiation (PAR) within the crop canopy. Crops sown on 19 February and 1 March produced statistically similar yields. The cultivar Rama produced higher yields than B-67 and Kanke-1. Regression models suggested that the temperature profile and PAR within the crop canopy produced 69 and 39% variation in yield, respectively.  相似文献   

Effect of long-term application of fertilizers on soil quality and rice yield in a salt-affected coastal region of India     

S. Tripathi  A. Chakraborty  B. K. Bandyopadhyay  K. Chakrabarti 《Archives of Agronomy and Soil Science》2013,59(4):439-450

The studied soils were collected from a 24-year long-term fertilizer experiment with rice (Oryza sativa L.) grown on tropical Typic Endoaquepts during monsoon season only. The organic carbon (OC) and total nitrogen (TN) status of the soils improved with the N₁₀₀P₂₂K₄₂ treatment than the initial values at the start of the experiment. The available P status of the soils depleted in the N₁₀₀P₁₁K₂₂ and N₀P₀K₀ treatments than the initial value. Soil microbial biomass carbon (MBC) and basal soil respiration (BSR), activities of urease, acid and alkaline phosphatases as well as fluorescein diacetate hydrolyzing activity (FDHA) were the highest in the N₁₀₀P₂₂K₄₂ treatment. The highest percentage of MBC in OC in the N₁₀₀P₂₂K₄₂ treatment revealed the accumulation of organic matter with an overall improvement in nutrient status of soil, since MBC is a labile pool of plant nutrients. Long-term application of fertilizers (N₁₀₀P₂₂K₄₂) had no deleterious effect on microbial and biochemical soil quality parameters. Rice grain yields were inconsistent with N₁₀₀P₀K₀ and N₀P₀K₀ while that of N₁₀₀P₂₂K₄₂, N₁₀₀P₁₁K₂₂ and N₁₀₀P₂₂K₀ increased gradually during the course of the experiment for each block period of six years. The grain yield of rice showed high significant correlation with the microbial and biochemical soil parameters.  相似文献   

The disposition kinetics and residues of fenvalerate in tissues following a single dermal application to black bengal goats     

T. K. Mandal  A. K. Chakraborty  A. Bhattacharya  R. K. Ghosh  S. Majumder 《Veterinary research communications》1996,20(3):265-272

The disposition kinetics of fenvalerate were studied in goats after dermal application of 100 ml of 0.25% (w/v) solution. The insecticide persisted in the blood for 72 h. The mean (±SEM) V _d(area) and apparent t _1/2 () were 9.92±1.44 L/kg and 17.51±2.65 h, while the AUC and Cl_B values were respectively 82.15±7.40 g h/ml and 0.56±0.05 L/(kg h). Four days after the dermal application, the highest concentration of fenvalerate residues was found in the adrenal gland, followed by the biceps muscle, omental fat, liver, kidney, lung and cerebrum in that order. Fenvalerate caused hyperglycaemia but had no effect on serum protein and cholesterol levels. Serum acetylcholinesterase activities were increased after 24 h but were below the initial values from 48 to 120 h.Abbreviations Ache acetylcholinestase - AUC total area under the blood insecticide concentration-versus-time curve - Cl_B total body clearance - GLC gas-liquid chromatography - t _1/2() apparent elimination half-life - V _d(area) apparent volume of insecticide distribution based on area method  相似文献   

Effect of Microclimatic Parameters at Different Sowing Dates on Capsule Production of Sesame (Sesamum indicum L.) in a Tropical Humid Region     

R. Nath  P. K. Chakraborty  A. Chakraborty 《Journal of Agronomy and Crop Science》2000,184(4):247-252

An experiment was conducted during the summer seasons of 1993 and 1994 on sesame ( Sesamum indicum L.) to study the effect of certain meteorological parameters on the capsule production efficiency of the main stem and branches of sesame cultivars at different sowing dates in alluvial (Entisol) soil of the tropical humid region in West Bengal, India. The highest capsule production by the main stem and the first, second and third primary branches in accrocentric order was observed for the crop sown on 19 February. The number of capsules on the main stem was reduced by 70.51 and 34.98 % when the crop was sown on 21 March and 28 April, respectively. The humidity profile at 50 days after emergence (DAE) and photosynthetically active radiation (PAR) at 70 DAE had direct positive effects on main stem capsule production. The variations of 38, 21 and 56 % in main stem contribution to capsule production might be explained by the temperature profile, relative humidity and PAR, respectively. Thecultivar Rama produced higher numbers of capsules in branches than Kanke-1 and B-67 at all times of sowing.  相似文献   

Opening and closing of the bacterial RNA polymerase clamp     

A Chakraborty  D Wang  YW Ebright  Y Korlann  E Kortkhonjia  T Kim  S Chowdhury  S Wigneshweraraj  H Irschik  R Jansen  BT Nixon  J Knight  S Weiss  RH Ebright 《Science (New York, N.Y.)》2012,337(6094):591-595

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Isolation Of Trichophyton Rubrum (Castellani) Sabouraud, 1911, From Animals          下载免费PDF全文

A. N. Chakraborty  S. Ghosh    F. Blank 《Canadian journal of veterinary research》1954,18(12):436-438

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Serum LH in ewes treated with synthetic luteinizing hormone-releasing hormone-follicle stimulating hormone-releasing hormone (LH-RH-FSH-RH) at three periods of anestrus     

J J Reeves  G K Tarnavsky  P K Chakraborty 《Journal of animal science》1974,38(2):369-373

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Canopy Size and Induced Resistance in Stylosanthes scabra Determine Anthracnose Severity at High CO(2)     

Pangga IB  Chakraborty S  Yates D 《Phytopathology》2004,94(3):221-227

ABSTRACT This study examines the relative importance of canopy size and induced resistance to Colletotrichum gloeosporioides at 350- and 700-ppm atmospheric CO(2) concentrations on susceptible Stylosanthes scabra 'Fitzroy' from two studies in a controlled environment facility (CEF) and in the field. Plants were grown at the two CO(2) concentrations in a repeated experiment in the CEF and inoculated at 6, 9, or 12 weeks of age. Although the physiological maturity of plants was at a similar stage for all three ages, the number of lesions per plant increased with increasing plant age at both CO(2) concentrations. At 350 ppm, the increase was associated with canopy size and increasing infection efficiency of the pathogen, but at 700 ppm, it was associated only with canopy size, because infection efficiency did not change with increasing age. A level of resistance was induced in plants at 700 ppm CO(2). In a second study, plants were raised for 12 to 14 weeks at the two CO(2) concentrations in the CEF and exposed to C. gloeosporioides inoculum in replicated field plots under ambient CO(2) over three successive years. Fitzroy developed a dense and enlarged canopy, with 28 to 46% more nodes, leaf area, and aboveground biomass at high CO(2) than at low CO(2). Up to twice as many lesions per plant were produced in the high CO(2) plants, because the enlarged canopy trapped many more pathogen spores. The transient induced resistance in high CO(2) plants failed to operate when exposed to pathogen inoculum under ambient CO(2) in the field. These results highlight the need to consider both canopy size and host resistance in assessing the influence of elevated CO(2) on plant disease.  相似文献   

African origin of modern humans in East Asia: a tale of 12,000 Y chromosomes     

Ke Y  Su B  Song X  Lu D  Chen L  Li H  Qi C  Marzuki S  Deka R  Underhill P  Xiao C  Shriver M  Lell J  Wallace D  Wells RS  Seielstad M  Oefner P  Zhu D  Jin J  Huang W  Chakraborty R  Chen Z  Jin L 《Science (New York, N.Y.)》2001,292(5519):1151-1153

To test the hypotheses of modern human origin in East Asia, we sampled 12,127 male individuals from 163 populations and typed for three Y chromosome biallelic markers (YAP, M89, and M130). All the individuals carried a mutation at one of the three sites. These three mutations (YAP+, M89T, and M130T) coalesce to another mutation (M168T), which originated in Africa about 35,000 to 89,000 years ago. Therefore, the data do not support even a minimal in situ hominid contribution in the origin of anatomically modern humans in East Asia.  相似文献   

Protein modification by amino acid addition is increased in crushed sciatic but not optic nerves   总被引：3，自引：0，他引：3  

S Shyne-Athwal  R V Riccio  G Chakraborty  N A Ingoglia 《Science (New York, N.Y.)》1986,231(4738):603-605

Rat optic and sciatic nerves were crushed, and 10 minutes to 3 days later nerve segments between the crushed site and the cell body were removed and assayed for posttranslational protein modification by amino acid addition. Protein modification was comparable in intact optic and sciatic nerves, but in sciatic nerves increased to 1.6 times control levels 10 minutes after crushing and reached a maximum of ten times control levels by 2 hours. In optic nerves activity was decreased throughout the time course studied. The results indicate that, in a nerve which is capable of regeneration (sciatic), protein modification by the addition of amino acids increases immediately after injury, but a nerve incapable of regeneration (optic) is incapable of activating the modification reaction. These findings may be important in understanding the reasons for the lack of a regenerative response after injury to central mammalian nerves.  相似文献