Our Nature最新文献

{"title":"Pre-harvest Weeds of a Wheat Field at Biratnagar, Nepal","authors":"B. Niroula","doi":"10.3126/ON.V11I2.9597","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9597","url":null,"abstract":"Sixty eight species of weeds belonging to 22 families and 59 genera were recorded from a wheat field at Biratnagar during the pre-harvest condition. Based on species prevalence the dominant weed families were Asteraceae (17 species), Poaceae (13 species) and Fabaceae (6 species). Anagallis arvensis , Crepis japonica , Grangea maderaspatana, Polygonum plebeium were abundant and Fumaria indica, Leucas lavandulifilia, Rumex dentatus, Vicia angustifolia, V. hirsuta and V. tetrasperma were common species of weeds.  DOI: http://dx.doi.org/10.3126/on.v11i2.9597 Our Nature 2013, 11(2): 187-191","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"71 1","pages":"187-191"},"PeriodicalIF":0.0,"publicationDate":"2014-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84482253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of Fungicides against Sclerotial Blight of Tea Plant","authors":"I. Bhagat, B. Chakraborty","doi":"10.3126/ON.V11I2.9601","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9601","url":null,"abstract":"Tea, Camellia sinensis (L.) O. Kuntze is the most important hot beverage in the world today and one of the major cash crops of Nepal. Being a perennial, the tea plant possibly interacts with, more environmental problems than do most other plants. Sclerotial blight caused by Sclerotium rolfsii Sacc. is polyphagus fungal diseases which appears in the nursery grown tea seedlings. DOI: http://dx.doi.org/10.3126/on.v11i2.9601 Our Nature 2013, 11(2): 208-210","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"1 1","pages":"208-210"},"PeriodicalIF":0.0,"publicationDate":"2014-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84903636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution and Conservation of Less Known Rare and Threatened Plant Species in Kachchh, Gujarat, India","authors":"P. Joshi, H. Soni, S. Sunderraj, J. Joshua","doi":"10.3126/ON.V11I2.9541","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9541","url":null,"abstract":"The present survey was conducted in different terrains, habitats and ecosystems of Kachchh, Gujarat, India, for consecutive 3 years (2001-2002) in all possible climatic seasons, to know the present status of 6 less known rare and threatened plant species viz ., Ammannia desertorum , Corallocarpus conocarpus , Dactyliandra welwitschii , Limonium stocksii , Schweinfurthia papilionacea and Tribulus rajasthanensis . Distribution, abundance and population dynamics of these species were derived.  DOI: http://dx.doi.org/10.3126/on.v11i2.9541 Our Nature 2013, 11(2): 152-167","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"33 1","pages":"152-167"},"PeriodicalIF":0.0,"publicationDate":"2014-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89224712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen and Phosphorous Budget Analysis of Carp Based Polyculture Ponds in Chitwan, Nepal","authors":"S. Gurung, M. Shrestha, N. Pandit","doi":"10.3126/ON.V11I2.9535","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9535","url":null,"abstract":"An experiment was conducted in 12 earthen ponds of 200 m 2 at Kathar VDC, Chitwan, Nepal for 270 days to analyze the productivity and nutrient budget in some carp based polyculture systems. The experiment was conducted in a completely randomized design with four treatments in triplicate each: a) Carps only or control (7000 fish/ha) (T 1 ); b) Carps (7000/ha) + tilapia (3000/ha) (T 2 ); c) Carps (7000/ha) + tilapia (3000/ha) + sahar  (500/ha) (T 3 ); and d) Carps (7000/ha) + tilapia (3000/ha) +  sahar (1000/ha) (T 4 ). Silver carp ( Hypophthalmich­thys molitrix ), bighead carp ( Aristichthys nobilis ), common carp ( Cyprinus carpio ), grass carp ( Ctenopharyngodon idella ), rohu ( Labeo rohita ) and mrigal ( Cir­rhinus mrigala ) of mean stocking size 3.0, 4.2, 10.0, 18.8, 10.5, 2.2 g, respectively were stocked in all ponds at the ratio of 4:2:1:1:1:1. The mean stocking size of Nile tilapia ( Oreochromis niloticus ) and sahar ( Tor putitora ) were 9.7 and 3.4 g, respectively. The ponds were fertilized weekly with urea and di-ammonium phosphate @ 4 g N and 1 g P/m 2 /day. Fish were fed with locally made pellet feed (20% CP) once in an alternate day at @ 2% body weight. At harvest, the extrapolated fish yield ranged from 1.5 to 1.7 t/ha/year in different treatments, without significant differences among treatments (P>0.05). Inclusion of sahar in Nile tilapia ponds decreased recruits by 63 to 72%. There were no significant differences in water quality parameters among treatments, except dissolved oxygen concentration, which was significantly lower in T 1 and T 3 than T 2 and T 4 (p<0.05). Both nitrogen and phosphorous were gained from fish species and lost from soil and water. There were no significant differences in nitrogen and phosphorous contents of all inputs and outputs among treatments. The unaccounted nitrogen and phosphorous loss ranged from 9.8-17.1% and 51.2-64.4%, respectively. The nitrogen and phosphorous required for producing 1 kg fish ranged from 337.5-375.9 g and 130.3-150.9 g, without significant difference among treatments. The nitrogen and phosphorous discharged for producing 1 kg fish ranged from 1.59-4.35 g and 1.6-9.3 g, respectively. DOI: http://dx.doi.org/10.3126/on.v11i2.9535 Our Nature 2013, 11(2): 116-125","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"14 1","pages":"116-125"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87332864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impacts of Damming on Ichthyo-faunal Diversity of Marshyangdi River in Lamjung district, Nepal","authors":"R. Mandal, D. Jha","doi":"10.3126/ON.V11I2.9536","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9536","url":null,"abstract":"A study was conducted to assess the impacts of dam on fish diversity of Marshyangdi River and its tributaries in Lamjung district. Twenty six species of fishes belonging to 5 orders, 6 families and 18 genera were recorded from the different localities. Cyprinidae was the most dominant among the families represented by 53.8% species followed by Cobitidae (23.0%), Sisoridae (7.7%) and Channidae (7.7%) while Anguillidae and Synbranchidae accounted each by 3.9% only. Gut contents of fish species recorded were studied. Site specific presence of fish species indicated that damming on the main river affected the movement of migratory fishes.  DOI: http://dx.doi.org/10.3126/on.v11i2.9536 Our Nature 2013, 11(2): 168-176","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"233 1","pages":"168-176"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73109516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Hydrochemical Characters Variations in Relation to Phytoplankton during Pre-monsoon at J-point of Mahi Estuary, Gujarat, India","authors":"J. Kumar, Shamiyan R. Khan, Rita Kumar, P. R. Sajish","doi":"10.3126/ON.V11I2.9533","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9533","url":null,"abstract":"Variations of hydro-chemical characters were recorded at three sites of Mahi estuary, near J-point (Lat. 22o10.3′N and Long. 72o44.28′E) during the pre-monsoon period. The concentration of the nutrients was relatively high due to the elevated atmospheric temperature, evapo-transpiration of water, slow saline intrusion as well as low inflow of surface water from Mahi River. On the contrary, dissolved oxygen (DO) was at its minimum level during this investigated period. The trophic status of all the three study stations was determined in terms of DO, phosphate, nitrate and sulphate in relation to phytoplankton as key pollution indicators species like Navicula , Nitzchia , Oscillatoria , Scenedesmus , Syndra and others. The results revealed that all the three sites are organically polluted as per the Palmer’s species diversity indices. DOI: http://dx.doi.org/10.3126/on.v11i2.9533 Our Nature 2013, 11(2): 85-95","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"83 1","pages":"85-95"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90967797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conservation of Critically Endangered Olive Barb Puntius sarana (Hamilton, 1822) through Artificial Propagation","authors":"M. Siddik, Ashfaqun Nahar, F. Ahamed, Z. Masood, M. Y. Hossain","doi":"10.3126/ON.V11I2.9534","DOIUrl":"https://doi.org/10.3126/ON.V11I2.9534","url":null,"abstract":"The Olive barb Puntius sarana (Hamilton, 1822) is a member of the family Cyprinidae and its conservational status has been referred as critically endangered in Bangladesh and vulnerable in India. An experiment on artificial propagation of the critically endangered fish P . sarana was carried out to determine the suitable dose of pituitary gland (PG) hormone as well as to determine the effective breeding season for the conservation of this critically endangered fish species. Three breeding trials (April 2010, June 2010 and July 2010) have been taken into consideration with PG doses in three different treatments (4.5, 5.5, 6.5 mg/kg body weight, respectively) having three replications of each. Brood fishes were collected from the Kangsha River (Netrokona) and reared in the experimental ponds, providing special diet upto their maturation. A total of 18 broods (9 female and 9 male) were selected for induced breeding in each trial. To observe the effective dose for induced breeding, the females were first injected at the rate of 4.5, 5.5 and 6.5 mg PG/kg body weight in T 1 , T 2 and T 3 , respectively in each trial. On the other hand, the males were administrated at the rate of 2 mg PG/kg body weight. The breeding performance in terms of ovulation, fertilization and hatching rate were studied. Induced breeding, in trial-2 obtained the better result in terms of ovulation, fertilization and hatching rate compared to other two trials. In trial-2 among the treatments, T 2 with doses of 5.5 mg/kg body weight showed better result than other two treatments where 4.5 and 6.5 mg/kg body weight PG doses were used in T 1 and T 3 , respectively. The findings of the present study can be used in induced breeding of P. sarana for the development of hatchery propagation as well as to conserve this valuable critically endangered species. DOI: http://dx.doi.org/10.3126/on.v11i2.9534 Our Nature 2013, 11(2): 96-104","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"11 1","pages":"96-104"},"PeriodicalIF":0.0,"publicationDate":"2014-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81198535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Food and Feeding Habits of the Mola Carplet Amblypharyngodon mola (Hamilton, 1822) in Rice Field Ecosystem with Consideration of Water Quality Parameters","authors":"M. R. Mondol, D. A. Nahar, S. Dewan, Md. Mosaddequr Rahman, S. Jasmine, M. Hossain","doi":"10.3126/ON.V11I1.8245","DOIUrl":"https://doi.org/10.3126/ON.V11I1.8245","url":null,"abstract":"The present investigation was conducted in the Agronomy field laboratory of Bangladesh Agricultural University, Mymensingh, Bangladesh during May 1999 to August 1999 to reveal the food and feeding habits of Amblypharyngodon mola in the rice field ecosystem. Percentage of frequency of occurrence and percentage in number methods were used for the qualitative and quantitative estimation of plankton population. Results showed that, during the present study, the water quality parameters were within the suitable range for optimal fish growth and plankton population was abundant in the water of the rice plots. Gut content analysis of A. mola revealed a sum of 32 genera of phytoplankton belonging to Chlorophyceae (17), Euglenophyceae (2), Cyanophyceae (7) and Bacillariophyceae (6) and 8 genera of zooplankton under Rotifera (3), Cladocera (2) and Copepoda (3). In general, Navicula, Fragilaria, Chlorella, Chrysococcus, Closterium, Oscillatoria and Gomphosphaeria were found abundant both in the water of the rice plots and in the gut contents of A. mola indicating that, these genera are preferred food of this fish in the rice field ecosystem. Gut content analysis also exposed that, phytoplankton was the major food item constituting 94.38% of the gut contents’ composition of A. mol a whereas zooplankton comprised only 5.62%. The results of this study conclude that, the A. mola is planktivorous in nature, feeding mostly on phytoplankton and could be a suitable species for integrated rice-fish farming. DOI: http://dx.doi.org/10.3126/on.v11i1.8245 Our Nature Vol.11(1) 2013: 61-75","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"26 1","pages":"61-75"},"PeriodicalIF":0.0,"publicationDate":"2013-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72872097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption Studies of Chromium by Using Low Cost Adsorbents","authors":"N. Gandhi, D. Sirisha, K. Sekhar","doi":"10.3126/ON.V11I1.8238","DOIUrl":"https://doi.org/10.3126/ON.V11I1.8238","url":null,"abstract":"The presence of toxic heavy metals such as chromium (VI) contaminants in aqueous streams, arising from the discharge of untreated metal containing effluents into water bodies, is one of the most important environmental problems. Adsorption is one of the effective techniques for chromium (VI) removal from wastewater. In the present study, adsorbent was prepared from low cost adsorbents and studies were carried out for chromium (VI) removal. Batch adsorption studies demonstrated that the adsorbents had significant capacity to adsorb the chromium from aqueous solution. It was found that the adsorption increased with increase in contact time and adsorbent dosage. An attempt was made to study mixed algae as an adsorbent for removal of chromium (VI). DOI: http://dx.doi.org/10.3126/on.v11i1.8238 Our Nature Vol.11(1) 2013: 11-16 ?","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"82 1","pages":"11-16"},"PeriodicalIF":0.0,"publicationDate":"2013-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83744657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studies on Length-weight and Length-length Relationships, Relative Condition Factor and Fulton’s Condition Factor of Hemiculter leucisculus (Pisces: Cyprinidae) from the Southwestern Caspian Sea Basin","authors":"H. Mousavi-Sabet, A. Habibi, O. Bagherpur","doi":"10.3126/ON.V11I1.8240","DOIUrl":"https://doi.org/10.3126/ON.V11I1.8240","url":null,"abstract":"In this study, length-weight (LWR) and length-length relationships (LLRs), relative condition factor (k rel ) and Fulton’s condition factor (k) of 235 Hemiculter leucisculus Basilewsky were determined between the periods of March 2012 to February 2013 in Sefidroud River, in the Southwestern Caspian Sea basin. The maximum recorded total length for males and females were 16.90 cm and 18.10 cm, respectively. The length-length relationships among the total length (TL), fork length (FL) and standard length (SL) for H. leucisculus were found to be highly significant (r 2 >0.968, p<0.001). The length-weight relationship shows the obtained b values for males, females and male-females were 2.549, 2.680 and 2.465 respectively, which indicated a negative allometric growth trend of this species. Also, relative condition factor (K rel ) for males, females and male-females were 0.710, 0.622 and 0.743 respectively and Fulton’s condition factor (K) for males, females and male-females were 0.922, 0.842 and 0.843 respectively. These results will be useful for ?shery managers to impose adequate regulations for sustainable ?shery management. DOI: http://dx.doi.org/10.3126/on.v11i1.8240 Our Nature Vol.11(1) 2013: 25-30","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"8 2 1","pages":"25-30"},"PeriodicalIF":0.0,"publicationDate":"2013-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83652861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}