Biology and life table of Diaeretiella rapae against Brevicoryne brassicae on different cultivars of cauliflower     

Thakur  Shikha  Verma  Subhash Chander  Sharma  Prem Lal  Chandel  Rajeshwar Singh  Sharma  Priyanka  Sharma  Shubham  Sharma  Prajjwal 《Phytoparasitica》2023,51(2):189-198

Phytoparasitica - Diaeretiella rapae (McIntosh) (Hymenoptera: Braconidae) is one of the most promising, effective and a common endoparasitoid of different aphid species including cabbage aphid,...  相似文献   

Real-time adaptive irrigation scheduling under a limited water supply   总被引：5，自引：0，他引：5  

N. H. Rao  P. B. S. Sarma  Subhash Chander 《Agricultural Water Management》1992,20(4):267-279

The problem of real-time irrigation scheduling under limited water supply is considered. The goal is to develop an irrigation operation policy which maximizes crop yields and is responsive to current season changes in weather and other variables. Because irrigation decisions are sequential and dependent on crop and soil water status, and also because crop yields can only be known at the end of the season, the decisions are arrived at by a two-stage process. In the first or the design stage, irrigations are planned for the entire season at weekly intervals using historical data and an optimal irrigation scheduling model. In the second stage, the decisions for the subsequent weeks are revised each week after updating the status of the system with real time data up to that week and solving the irrigation optimization model once again for the new conditions. Thus, each week an irrigation decision is made, the entire planning horizon is kept in view. The procedure is illustrated by application to a case study.  相似文献   

Privatization of Veterinary Services in Developing Countries: A Review     

Sen A  Chander M 《Tropical animal health and production》2003,35(3):223-236

Increasing fiscal constraints on the government, a lackadaisical performance by public sector animal health and breeding services and pressure from donor partners have prompted the governments of various developing countries to rethink the role of the public sector in the provision of veterinary services. Various countries have started to implement, or have already implemented, privatization of some veterinary services. The results are mixed. It is established that private provision alone is not optimal, and a blend of private and public sector veterinary services is required to utilize the virtues of both.The privatization process has also begun in India. Certain state governments in India are pursuing a cost recovery approach and are encouraging private practitioners to cope with the financial constraints and to deliver broad and effective animal health and breeding services. This paper considers the global aspects of the privatization of veterinary services as well as the scenario in India, so as to gain an insight into the very complex and debatable issue of privatization of veterinary services.  相似文献   

Erratum to: Methane emissions from river buffaloes fed on green fodders in relation to the nutrient intake and digestibility     

Sonali Prusty  Madhu Mohini  Shivlal Singh Kundu  Ajay Kumar  Chander Datt 《Tropical animal health and production》2014,46(1):71-71

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Geomorphology, pedology and sedimentology of the Deoha/Ganga–Ghaghara Interfluve, Upper Gangetic Plains (Himalayan Foreland Basin) — Extensional tectonic implications     

Satvindar Singh  B. Parkash  M.S. Rao  Manoj Arora  Balaji Bhosle   《CATENA》2006,67(3):148-203

Regional mapping of soils helped to identify and map 24 soil-geomorphic units on the Deoha/Ganga–Ghaghara Interfluve in the Upper Gangetic Plains (Himalayan Foreland Basin). On the basis of luminescence ages soil-geomorphic units can be grouped into five members of a Morphostratigraphic Sequence with ages of ≤ 1.7 ka, 1.8–3.6 ka, 4.6–6.4 ka, 6.8–10 ka and > 10 ka. Except for two units with sandy parent material, all the members with loamy parent materials show systematic increase in the degree of soil development from Member QGMS-I to V. Major pedogenic processes are salinization, alkalinization, illuviation, calcrete development and gleying, and degradation of some micromorphological features is observed in the oldest soils.Regional mapping and dating of soils show that the Interfluve between the Deoha/Ganga–Ghaghara rivers is bounded by longitudinal faults, along the bounding rivers. The major longitudinal faults trend N–S or NNE–SSW in the northern region; turn N–S in the central region and take easterly to SEE direction in the south, giving the Interfluve a curvilinear shape. Strike of a set of six transverse extensional normal faults changes from approximately E–W to NEE–SWW in the southernmost region of the Interfluve. Downthrown sides are to the south and to the east in northern region and western region, respectively.Due to the activity of different segments of various transverse faults during a probably dry sub-humid to semi-arid climatic period of 10–5 ka, terminal fans were deposited on the downthrown blocks. Thus, role of extensional tectonics in an overall compressional regime is significant. Also, tilting of smaller blocks leading to the shifting away of large rivers seems to be an additional control on the distribution of soils and sedimentation on the Interfluve.  相似文献   

Order and Disorder in C60 and KxC60 Multilayers: Direct Imaging with Scanning Tunneling Microscopy     

Li YZ  Chander M  Patrin JC  Weaver JH  Chibante LP  Smalley RE 《Science (New York, N.Y.)》1991,253(5018):429-433

Monolayer and multilayer structures of C(60), a high temperature van der Waals solid, have been studied with scanning tunneling microscopy. Structures grown on GaAs(110) at 300 kelvin and at elevated temperatures show significantly different morphologies because of balances between thermodynamics and kinetics. Condensation onto stepped surfaces demonstrates preferred bonding and nucleation at step edges. Detailed studies of potassium incorporation in crystalline C(60) show highly ordered structures in the K(3)C(60) metallic state but disordered non-metallic structures for high potassium concentrations.  相似文献   

Identification of the tet(B) resistance gene in Streptococcus suis     

Yogesh Chander  Simone R. Oliveira  Sagar M. Goyal 《Veterinary journal (London, England : 1997)》2011,189(3):359-360

The tetracycline resistance gene, tet(B), has been described previously in Gram negative bacteria. In this study tet(B) was detected in plasmid extracts from 17/111 (15%) Streptococcus suis isolates from diseased pigs, representing the first report of this resistance gene in Gram positive bacteria.  相似文献   

Different sources of heavy metals and their long-term effects on soil microbial properties   总被引：9，自引：3，他引：9  

Krishan Chander  Jens Dyckmans  Rainer Joergensen  Brunk Meyer  Markus Raubuch 《Biology and Fertility of Soils》2001,34(4):241-247

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Microbial biomass dynamics during the decomposition of leaf litter of poplar and eucalyptus in a sandy loam   总被引：1，自引：0，他引：1  

K. Chander  S. Goyal  K. K. Kapoor 《Biology and Fertility of Soils》1995,19(4):357-362

Soil microbiological properties during decomposition of leaf litter of poplar (Populus deltoides) and eucalyptus (Eucalyptus tereticornis) were studied under laboratory conditions. Microbial biomass C and ninhydrin-N were measured at different intervals up to 90 days following incorporation of poplar and eucalyptus leaves separately @ 20 and 100t ha^-1. In general, the net increase in total biomass C or ninhydrin N following amendment was larger in the soils which received poplar leaves than in the soils that received eucalyptus leaves. The amounts of biomass C, at day 90, in the soils which received eucalyptus leaves @ 20 and 100 t ha^-1 was about half and one-third, respectively, that of the soils that received poplar leaves at the same rates. Similarly, the field soils naturally receiving eucalyptus leaf litter contained about half the amounts of biomass C or ninhydrin N of the soils that received poplar leaf litter. In contrast, the amounts of organic C and total N were more in soils which received eucalyptus leaves both in the laboratory experiment and under field conditions than in the soils that received poplar leaves, indicating that the decomposition of eucalyptus leaves in soils was slower than that of poplar leaves. The ratio of biomass C/soil organic C in soils receiving eucalyptus leaves was about 2–4 times lower than those in soils with no admendment or soils receiving poplar leaves. These results, therefore, suggest that the allelochemicals released into soil during decomposition of eucalyptus leaves had a toxic effect on soil microorganisms and may thus affect the nutrient cycling and hence soil fertility.  相似文献   

Efficacy of closantel against fenbendazole and levamisole resistanthaemonchus contortus in small ruminants     

R. P. Uppal  C. L. Yadav  Chander Bhushan 《Tropical animal health and production》1993,25(1):30-32

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