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Singh, Mahendra
- Multiple Regression Analysis of Geoelectric Imaging and Geotechnical Site Investigation Test Results
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PDF Views:78
Authors
Affiliations
1 Department of Earth Sciences, IIT Roorkee, Roorkee 247 667, IN
2 Department of Civil Engineering, IIT Roorkee, Roorkee 247 667, IN
1 Department of Earth Sciences, IIT Roorkee, Roorkee 247 667, IN
2 Department of Civil Engineering, IIT Roorkee, Roorkee 247 667, IN
Source
Current Science, Vol 114, No 09 (2018), Pagination: 1946-1952Abstract
Geotechnical site characterization through non-invasive and cost-effective electrical resistivity imaging (ERI) and induced polarization imaging (IPI) offers promise compared to conventional point-geotechnical site investigations (standard penetration test, SPT), for which a basic understanding of factors (grain size (sand, fines) and water content) influencing them is needed. Here we perform a multiple regression analysis of ERI, IPI and SPT results in a site investigation at Lucknow, India. The results show that grain size and water content influence both chargeability and SPT values in a similar manner, while resistivity values are affected differently with a low RMS prediction error for chargeability.Keywords
Geoelectronic Imaging, Geotechnical Site Characterization, Multi-Regression Analysis, Grain Size, Water Content.Full Text
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- Alternaria alternata causes leaf and fruit blight in makhana
Abstract Views :165 |
PDF Views:81
Authors
Affiliations
1 Department of Plant Pathology, Bihar Agricultural University, Sabour 813 210, IN
2 Department of Molecular Biology and Genetic Engineering, Bihar Agricultural University, Sabour 813 210, IN
3 Department of Soil Science and Agriculture Chemistry, Bihar Agricultural University, Sabour 813 210, IN
4 Department of Entomology, Bihar Agricultural University, Sabour 813 210, IN
1 Department of Plant Pathology, Bihar Agricultural University, Sabour 813 210, IN
2 Department of Molecular Biology and Genetic Engineering, Bihar Agricultural University, Sabour 813 210, IN
3 Department of Soil Science and Agriculture Chemistry, Bihar Agricultural University, Sabour 813 210, IN
4 Department of Entomology, Bihar Agricultural University, Sabour 813 210, IN
Source
Current Science, Vol 121, No 11 (2021), Pagination: 1492-1495Abstract
Makhana (Euryale ferox) is a high-value commodity of nutritional, medicinal and ritualistic significance. North Bihar has occupied a prominent position in terms of both production and productivity of makhana not only in India, but across the globe. Leaf blight disease on makhana was noticed in April 2018, with a severity of 15–20% in a survey of farmers’ ponds in North Bihar. Symptoms of the disease were circular, small, light-brown, necrotic, sunken lesion that later turned into a large, dark, blighted area in the leaves. Blighting of fruits was also noticed during June and July 2018. Blighted fruits were small, distorted and twisted with less seed. Alternaria alternata was identified as the pathogen causing the disease based on morphological and cultural characteristics of the culture maintained on potato dextrose agar from symptomatic leaf and fruit samples. The fungus gave rise to greyish to grey–black colonies with obclavate to obpyriform, catenulate conidia in chains. Conidia consisted of 2–5 horizontal and 0–2 vertical septa and measured 15–60 ´ 5–9 mm in dimension. Molecular confirmation was done by sequence analysis of the internal transcribed spacer (ITS) regions of rDNA using ITS1 and ITS4 primers. Eventually, pathogenicity test inferred that leaf and fruit blight in makhana are due to A. alternata infectionKeywords
Alternaria alternata, Euryale Ferox, Leaf and Fruit Blight, Makhana, Pathogenicity Test.Full Text
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