Informatics Publishing Limited

Sudhakar Reddy , Chiranjibi Pattanaik , N. K. Dhal , A. K. Biswal

Abstract

Bhitarkanika National Park of Orissa has much significance due to ecological, biological and geomorphological background. It has rich floristic diversity and great variability at species and ecosystem levels in consisting of different types of vegetation in different habitats representing Diospyros swamp forest, Tamarix-Salvadora scrub, palm swamp, salt marshes, grasslands, sand dune and aquatic vegetation. Number of species identified are 372 belonging to 262 genera under 100 families.

Full Text

     

A. K. Bhadra , N. K. Dhal , N. C. Rout , V. Raja

Abstract

Phytosociological study of the tree community was carried out in tropical dry deciduous forest of Gandhamardan hill ranges belonging to Eastern Ghats at Harishankar of Bolangir district, Orissa, India. Twenty five quadrates of 20×20m size (Area=10000m²=1ha) were laid in the lOOha protected forest (N = 20° 51' 027", E = 82° 51' 59.2") of Harishankar complex along GPS locations covering its whole geography. Tree (GBH≥ 15cm) stand density was 743ha^-1. A total of thirty two tree species were found which includes 30 genera and 20 families. Top five species holding highest IVI value are Shorea robusta Gaertn.f, Diospyros melanoxylon Roxb, Haldinia cordifolia (Roxb.) Ridsdak. Pterocarpus marsupium Roxb. and Anogeissus latifolia (Roxb.ex DOWall.ex Guill. & Perr. Eight species are randomly distributed and twenty four are contiguously distributed while none of them showed regular in distribution. All individuals of tree species have been grouped into 20 girth classes. The Shannon-Wiener (H') diversity index of studied site is 1.35 with Simpson's value 0.921.This study reveals prevalent clumping nature of the tree community in the natural forest of Gandhamardan hill ranges.

Keywords

Phytosociology, Frequency, Density, Dominance, Vegetation Profile

Full Text

     

D. K. Sahu , S. Biswas , N. K. Dhal , M. Brahmam

Abstract

Extensive and intensive field surveys have been conducted in different forest pockets of Malkangiri with a view to assess the floristic wealth of the district. A sum total of 381 species belonging to 275 genera and 92 Families were collected, identified and incorporated. Out of these, 373 species represent Angiospermae (304 species of Dicot and 69 species of Monocot families), 7 species of Pteridophytes (7 species of Ferns belonging to 7 genera) and 1 species of Gymnosperms. The ratio of monocot to dicot families, genera and species are 1:4.25, 1:4.13 and 1:4.40 respectively. Present exploration enumerates 235 herbs, 51 shrubs, 69 trees and 26 climbers. Out of total 84 families of angiosperms, the dominant families in ascending order are Fabaceae, Poaceae, Acanthaceae, Asteraceae, Euphorbiaceae, Malvaceae, Caesalpiniaceae, Rubiaceae, Lamiaceae, Combretaceae, Cyperaceae, Mimosaceae, Amaranthaceae and Scrophulariaceae. Study highlights the rich floristic diversity of the district.

Keywords

Eastern Ghats, Malkangiri, Flora, Orissa

Full Text

     

G. Biswal ¹, N. K. Dhal ²

Affiliations
1 Department of Plant Pathology,College of Agriculture,Orissa University of Agriculture and Technology, Bhubaneswar Orissa
2 Department of Plant Pathology,College of Agriculture,Orissa University of Agriculture and Technology, Bhubaneswar Orissa, IN

Abstract

Potato is a high yielding short duration crop and produces stastically more edible energy, protein and dry matter per unit area and time than many other crops. Major contributing factor for reduction of yield in the state(14.1q/h) of the crop than national level(18.8 q/h) was due to occurrence of different diseases. The present study was conducted at 7 locations and 6 districts of Odisha to assess the percentage of disease incidence following fixed plot survey in three consecutive years 2005-06 to 2007-08.The survey revealed that early blight,late blight ,black leg ,bacterial wilt and mild mosaics were different diseases in growing stage while the diseases like brown rot, soft rot and scab could be noticed at the harvesting stage.

Keywords

Fixed Plot Survey, Yield Loss, Assessment Of Diseases, Potato

Full Text

     

M. Brahmam ¹, N. K. Dhal ¹, H. O. Saxena ¹

Affiliations
1 Regional Research Laboratory, Bhubaneswar, IN

Abstract

Eighty three plant samples collected from the forests of erstwhile Kalahandi, Keonjhar, Koraput, Cuttack, Dhenkanal and Khurda districts of Orissa were screened for finding out new sources of therapeutically important active compounds. Tannins were found in 33, saponins in 4, flavonoids in 19 and alkaloids in 7 samples. Out of 83 samples screened, 40 samples belonging to 34 species were found to respond negatively for all the above ingredients. Garuga pinnata was found to contain 24.7% of tannins in its bark and the presence of saponins was recorded for the first time in the fruits of Eriolaena hookeriana.

Full Text

   

M. Brahmam ¹, N. K. Dhal ¹

Affiliations
1 Regional Research Laboratory, Bhubaneswar, IN

Abstract

Nabarangapur district of Orissa is floristically worked out. The vegetation of the district is found to fall broadly under 1). Tropical semi-evergreen Forests and 2). Tropical Dry Deciduous Forests as per the classification of Champion and Seth. In addition to the above, several sub types and sera1 types like Bamboo btakes, Riparian Fringing Forest, Scrubs, Grasslands etc. are noticed. The natural vegetation which was predominantly arboreal before 1970 became greatly modified due to the settlements of East Bengal (Bangladesh) refugees under Dandakaranya rehabilitation programme.

Full Text