Browsing by Author "D.N. Singh"

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Cropping geometry and nutrient management study on winter maize {Zea mays) + potato (Solatium tuberosum) intercropping
(Indian Council of Agricultural Research, 2021) V.K. Verma; R.N. Meena; D.N. Singh; P.K. Upadhyay; Rajesh Kumar Singh; Rajiv Kumar Singh
Field experiment was conducted during rabi during 2015-16 and 2016-17 at Varanasi (UP) to study the effect of cropping geometry and nutrient management on winter maize (Zea mays L.) + potato (Solatium tuberosum L.) •intercropping.Among the crop geometry, winter maize intercropped with potato (1:1) in replacement series showed significantly higher growth parameters of maize, viz.dry matter accumulation, crop growth rate and number of green leaves per plant as compared to additive series but it was found at par when winter maize grown with potato (1:2) in replacement series.However, growth parameters of potato differed interchangeably as compared to maize in winter maize + potato intercropping system during both the years.Significantly higher grain yield of winter maize and potato were found in intercropping with 1:1 and 1:2 in additive series, respectively.Assessment of intercropping indices and economics of maize and potato proved to be better in additive series as compared to replacement series during both the years of experimentation.Amongst nutrient management, growth parameters, yield attributes and yield, intercropping indices and economics of winter maize + potato were recorded significantly higher with the application of 100% RDF + 25% N through poultry manure followed by the application of 100% RDF + 25% N through vermicompost as compared to rest of the treatments during both Uie years.Thus, it may be concluded that the maize + potato intercropping in additive series with integration of poultry manure as N source gives better yield and economics of both the crops. © 2021 Indian Council of Agricultural Research. All rights reserved.
Force Fields for C≡N-Substituted Benzenes. II - Planar and Non-Planar Modes of the Three Isomeric Dicyanobenzenes
(John Wiley and Sons Ltd, 1997) D.N. Singh; J.S. Singh; R.A. Yadav
Planar and non-planar force field calculations for o-, m- and p-dicyanobenzenes were carried out using published data on the parent molecule and one isotope in each case. General valence force fields were determined using 61 (43 planar and 18 non-planar), 61 (43 planar and 18 non-planar) and 58 (41 planar and 17 non-planar) parameters for the o-, m- and p-isomers respectively. It was found that the earlier proposed assignments for some of the wavenumbers need to be revised. © 1997 by John Wiley & Sons, Ltd.
Force filelds for planar and non-planar modes of fluorobenzene revisited
(1999) J.S. Singh; D.N. Singh; R.A. Yadav
The force field calculations for planar and non-planar modes of fluorobenzene have been revised using more accurately observed values of fundamentals [J Mol Spectrosc, 73 (1978) 290] of the parent molecule and its two deuterated analogues namely, fluorobenzene -p-d and -d5. As many as 38 planar and 17 non-planar parameter force fields have been determined leading to alteration of the earlier proposed vibrational assignments for some of the normal modes. In addition, two types of ring torsional coordinates, namely, I: (ΔΦcccc + ΔΦxccx) and II : ( ΔΦxccc + ΔΦcccx + ΔΦcccc + ΔΦxccx) were used separately to study the effect of the definition on the force constants. It is found that the principal ring torsional force constant in the set (I) are nearly four times of those in the set (II). As expected non-diagonal force constants are also seen to be affected, however, to small degrees. In the present case 3 principal force constants corresponding to the 3 pairs of the C-C bond stretching motions have been taken. Similarly, corresponding to 3 types of the C-H stretching, 3 types of the C-H bending and 4 types of the C-C-C angle bending motions, the number of principal force constants are 3, 3 and 4 respectively. The variation of the 3 C-C stretching principal force constants from their average value is within 2.3%. Similarly, the C-H stretching, the C-H planar bending and the C-C-C angle bending principal force constants show variations within 0.9%, 7.6% and 29.4% respectively from their average values. Variations of the non-planar principal force constants involving the C-H non-planar bendings and the C-C torsions are within 14.6% and 1.3% for the set I and within 10.5% and 23.4% for the set II.
From QTL to variety-harnessing the benefits of QTLs for drought, flood and salt tolerance in mega rice varieties of India through a multi-institutional network
(Elsevier Ireland Ltd, 2015) Renu Singh; Yashi Singh; Suchit Xalaxo; S. Verulkar; Neera Yadav; Shweta Singh; Nisha Singh; K.S.N. Prasad; K. Kondayya; P.V. Ramana Rao; M. Girija Rani; T. Anuradha; Y. Suraynarayana; P.C. Sharma; S.L. Krishnamurthy; S.K. Sharma; J.L. Dwivedi; A.K. Singh; P.K. Singh; Nilanjay; N.K. Singh; Rajesh Kumar; S.K. Chetia; T. Ahmad; M. Rai; P. Perraju; Anita Pande; D.N. Singh; N.P. Mandal; J.N. Reddy; O.N. Singh; J.L. Katara; B. Marandi; P. Swain; R.K. Sarkar; D.P. Singh; T. Mohapatra; G. Padmawathi; T. Ram; R.M. Kathiresan; K. Paramsivam; S. Nadarajan; S. Thirumeni; M. Nagarajan; A.K. Singh; Prashant Vikram; Arvind Kumar; E. Septiningshih; U.S. Singh; A.M. Ismail; D. Mackill; Nagendra K. Singh
Rice is a staple cereal of India cultivated in about 43.5Mha area but with relatively low average productivity. Abiotic factors like drought, flood and salinity affect rice production adversely in more than 50% of this area. Breeding rice varieties with inbuilt tolerance to these stresses offers an economically viable and sustainable option to improve rice productivity. Availability of high quality reference genome sequence of rice, knowledge of exact position of genes/QTLs governing tolerance to abiotic stresses and availability of DNA markers linked to these traits has opened up opportunities for breeders to transfer the favorable alleles into widely grown rice varieties through marker-assisted backcross breeding (MABB). A large multi-institutional project, "From QTL to variety: marker-assisted breeding of abiotic stress tolerant rice varieties with major QTLs for drought, submergence and salt tolerance" was initiated in 2010 with funding support from Department of Biotechnology, Government of India, in collaboration with International Rice Research Institute, Philippines. The main focus of this project is to improve rice productivity in the fragile ecosystems of eastern, northeastern and southern part of the country, which bear the brunt of one or the other abiotic stresses frequently. Seven consistent QTLs for grain yield under drought, namely, qDTY1.1, qDTY2.1, qDTY2.2, qDTY3.1, qDTY3.2, qDTY9.1 and qDTY12.1 are being transferred into submergence tolerant versions of three high yielding mega rice varieties, Swarna-Sub1, Samba Mahsuri-Sub1 and IR 64-Sub1. To address the problem of complete submergence due to flash floods in the major river basins, the Sub1 gene is being transferred into ten highly popular locally adapted rice varieties namely, ADT 39, ADT 46, Bahadur, HUR 105, MTU 1075, Pooja, Pratikshya, Rajendra Mahsuri, Ranjit, and Sarjoo 52. Further, to address the problem of soil salinity, Saltol, a major QTL for salt tolerance is being transferred into seven popular locally adapted rice varieties, namely, ADT 45, CR 1009, Gayatri, MTU 1010, PR 114, Pusa 44 and Sarjoo 52. Genotypic background selection is being done after BC2F2 stage using an in-house designed 50K SNP chip on a set of twenty lines for each combination, identified with phenotypic similarity in the field to the recipient parent. Near-isogenic lines with more than 90% similarity to the recipient parent are now in advanced generation field trials. These climate smart varieties are expected to improve rice productivity in the adverse ecologies and contribute to the farmer's livelihood. © 2015 Elsevier Ireland Ltd.
Impaired phagocytosis in acute peritonitis
(1982) D.N. Singh; H.S. Shukla; B.N.S. Bhatnagar; P.C. Sen
[No abstract available]
Influence of NPK, S and variety on growth, yield and quality of irrigated linseed (Linum usitatissimum)
(2013) D.N. Singh; J.S. Bohra; J.K. Singh
[No abstract available]
IR and Raman spectra, force fields, barrier heights and thermodynamic functions for isomeric trifluoromethyl anilines
(John Wiley and Sons Ltd, 1996) D.N. Singh; R. Shanker; R.A. Yadav; I.S. Singh
Raman spectra (50-4000 cm-1) together with depolarization ratio measurements and IR spectra (180-4000 cm-1) of isomeric trifluoromethylanilines were recorded. Vibrational assignments for the observed wavenumber were made assuming C, symmetry for all the molecules. Using the thus assigned fundamentals and assumed structural parameters, general valence force fields were determined. Consistent assignments for the internal modes of the CF3 and NH2 groups are proposed and the substituent-sensitive phenyl-ring modes are discussed. Barriers to internal rotations for the CF3 and NH2 tops were determined using the single top theory. The thermodynamic functions were also computed.
Laser Raman and IR spectra and force fields for 2,4-dichlorobenzonitrile
(2001) V.K. Rastogi; Vaibhav Jain; M. Alcolea Palafox; D.N. Singh; R.A. Yadav
Raman spectrum of 2,4-dichlorobenzonitrile (2,4-DCBN) in powder form has been recorded in the region 50-4000 cm-1 on a Jasco K-500 Raman spectrophotometer using the 488.0 nm radiation from an argon laser. FTIR spectra in the region 200-4000 cm-1 have been recorded in KBr pellet and nujol mull on a Nicolet DX spectrometer. Using the observed Raman and IR frequencies, normal co-ordinate analysis has been carried out to support the vibrational analysis and to determine the planar and non-planar force fields. © 2001 Elsevier Science B.V.
Laser Raman and IR spectra and force fields for 2,6-difluorobenzonitrile
(Elsevier, 1997) V.K. Rastogi; C.B. Arora; S.K. Singhal; D.N. Singh; R.A. Yadav
Raman spectrum of 2,6-difluorobenzonitrile in the powder form has been recorded in the region 50-4000 cm-1 on a Jasco K-500 spectrophotometer using the 488.0 nm radiation from an argon laser. IR spectra in the region 200-4000 cm-1 have been recorded in KBr pellet and nujol mull on a Nicolet DX spectrometer and in liquid and vapour phases on a Jasco FTIR/7000 spectrometer. Using these observed frequencies force field calculations for the planar and non-planar modes have been carried out assuming a general valence force field. © 1997 Elsevier Science B.V.
Petrov classification of the cylindrically symmetric gravitational field
(1968) K.P. Singh; D.N. Singh
Considers the most general cylindrically symmetric space-time from the point of view of Petrov classification. The Pirani matrix has been classified into six distinct cases. The Segre characteristics reveal that the cylindrically symmetric metric belongs to either Petrov type I or Petrov type II. It is also found that when the metric potentials are functions of time alone the space-time admits perfect fluid distribution.
Spatial organization of socio-economic facilities in Kopaganj Block (Azamgarh Dt., U. P.): an appraisal of existing structure
(1987) D.N. Singh; S.C. Rai
The objective of the present paper is to focus attention on spatio-functional gaps in the existing structure of the socio-economic facilities so as to provide a basis for extending some viable suggestions for their proper organization in spatial as well as functional perspectives in the study area. Located in the eastern part of the Azamgarh district of the middle Ganga Plain, the study area embraces an area of 194.6km2 comprising ten nyayapanchayats and 144 (12 uninhabited) villages. -from Authors
Towards a sustainable future - Issues and perspectives
(2007) D.N. Singh
[No abstract available]