Micro-nutrient pools and their mobility in relation to land-use system in a cold high altitude Himalayan mountainous region     

Sharma  Sandeep  Singh  Pritpal  Angmo  Padma  Dhaliwal  S. S. 《Agroforestry Systems》2021,95(8):1395-1412

Agroforestry Systems - Land-use change significantly impacts soil micro-nutrients distribution and transformations due to their inefficient scale- and location-specific management in different...  相似文献   

Antimicrobial ability and growth promoting effects of feed supplemented with probiotic bacterium isolated from gut microlfora of Cirrhinus mrigala     

Anita Bhatnagar  Ritu Lamba 《中国农业科学(英文版)》2015,(3)

The present studies were conducted to isolate, select, identify and characterize gut bacteria as antimicrobial and growth promoting agent for the feed of economical y important ifsh Cirrhinus mrigala. ...  相似文献   

Gharials (Gavialis gangeticus) in Bardiya National Park,Nepal: Population,habitat and threats     

Ashish Bashyal  Sandeep Shrestha  Kishor P. Luitel  Bhupendra P. Yadav  Bed Khadka  Jeffrey W. Lang  Llewellyn D. Densmore 《水产资源保护:海洋与淡水生态系统》2021,31(9):2594-2602

1. The Critically Endangered gharial (Gavialis gangeticus) residing within Bardiya National Park (BNP) in Nepal constitutes the sixth major sub-population of this unique lineage; however, this population is not well studied. A 46 km protected stretch of the Babai River and a 60 km stretch of the Karnali River in and around BNP were surveyed for gharials in early 2017 and in 2019.
2. Gharial counts in 2017 – 17 from the Babai and one from the Karnali rivers – consisted of 10 adults, five sub-adults and three juveniles. In 2019, 19 gharials were counted – 18 for the Babai and one for the Karnali – comprising 11 adults, six sub-adults and two juveniles. In the Babai River within BNP, four breeding groups were identified. Gharials in BNP prefer sandy vs. rocky banks for basking and completely avoid sand-grass and clay banks. Habitat preference did not vary with size class.
3. Protected stretches of both rivers inside BNP (76 km) have resident gharial, intact habitats and few human threats. In contrast, the unprotected stretch of the Karnali (30 km) is threatened by boulder quarrying, sand mining and unlicensed fishing, and is avoided by gharials despite the availability of habitat.
4. This study established baseline data, including indices of population size, distribution and habitat preferences, and documented resident gharials that are breeding in the Babai River in BNP. The conservation of this Babai population is crucial for the species’ survival in BNP.
5. Based on this study, we recommend the following conservation actions on the Babai stretch: (a) determine hatching success; (b) assess juvenile recruitment; (c) consider supplementation by releasing captives; (d) study riverine features important as baselines; (e) accommodate upstream movements on the protected Babai stretch; and (f) protect the downstream Babai outside the boundary of the BNP.

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Effect of inland water salinity on growth,feed conversion efficiency and intestinal enzyme activity in growing grey mullet, <Emphasis Type="Italic">Mugil cephalus</Emphasis> (Linn.): Field and laboratory studies     

Utpal Kumar?Barman  S. N.?Jana  S. K.?GargEmail author  Anita?Bhatnagar  A.R.T.?Arasu 《Aquaculture International》2005,13(3):241-256

Two experiments were conducted to investigate the effect of inland water salinity on growth performance, feed conversion efficiency and intestinal enzyme activity in grey mullet. In experiment I, a 90 day monoculture of grey mullet at different salinity levels (0, 10, 15, 20 and 25%) was carried out. The fingerlings were stocked at 5000 per hectare and fed on a supplementary diet at 5% BW d^–1. This Study revealed that fish growth mean body weight (90.5 ± 4.5 g) and mean length (21.6 ± 0.4 cm), SGR (4.70%) and growth per day (0.99 g d^–1) were significantly (p < 0.05) enhanced in fish maintained at 10% salinity in comparison with other treatments. Nutrient levels, phytoplankton population, NPP and chlorophyll a all decreased with an increase in salinity (>10%). In addition, zooplankton populations increased with an increase in the salinity level. Most of the other hydrochemical characteristics remained at optimal levels in all other treatments. Fish weight gain showed a significant positive correlation with productivity indicating parameters viz. alkalinity (r = 0.53), turbidity (r = 0.62), NPP (r = 0.75) and chlorophyll a (r = 0.46), clearly revealing that fish growth is also related to the trophic status of the ponds. In the second experiment (Experiment II), mullet fry were exposed to five different salinity levels (10, 15, 20, 25 and 30%) and maintained for 70 days in the laboratory. Significantly (p < 0.05) high growth, (SGR and per cent increase in body weight), feed conversion efficiency and intestinal enzyme activity were observed in the group maintained at 10 salinity in comparison with other groups maintained at similar salinity levels. Carcass composition, musc1e and liver glycogen levels were also significantly (p < 0.05) affected by salinity changes.  相似文献   

Rice straw recycling: A sustainable approach for ensuring environmental quality and economic security     

Anjani KUMAR  Amaresh Kumar NAYAK  Sandeep SHARMA  Ansuman SENAPATI  Debasis MITRA  Bipasa MOHANTY  Seenichamy Rathinam PRABHUKARTHIKEYAN  Kuttalingam Gopalasubramanian SABARINATHAN  Indra MANI  Rajendra Singh GARHWAL  Sugitha THANKAPPAN  Mahapatra Smruthi SAGARIKA  Sergio DE LOS SANTOS-VILLALOBOS  Periyasamy PANNEERSELVAM 《土壤圈》2023,33(1):34-48

One of the major challenges in Asian countries is the effective management of rice straw. To ensure food security for their ever-growing population, Asian countries grow more rice, leading to increasing rice straw generation. Burning of rice straw, a common practice, is detrimental to both environmental and human health. However, if managed effectively, rice straw has the potential to safeguard the sustainability of agricultural ecosystems and to uplift the economic security of the population de...  相似文献   

Soil loss hinders the restoration potential of tree plantations on highly eroded ravine slopes     

Kumar  Raj  Bhardwaj  A. K.  Rao  B. K.  Vishwakarma  A. K.  Kakade  Vijaysinha  Dinesh  D.  Singh  Gaurav  Kumar  Gopal  Pande  V. C.  Bhatnagar  P. R.  Bagdi  G. L. 《Journal of Soils and Sediments》2021,21(2):1232-1242

Journal of Soils and Sediments - Soil erosion and loss threatens vast tracts of agricultural and non-agricultural land, worldwide. High soil erosion severely affects establishment of vegetation via...  相似文献   

Seasonal changes of soil carbon fractions and enzyme activities in response to winter cover crops under long-term rotation and tillage systems     

Jasdeep Singh  Sandeep Kumar 《European Journal of Soil Science》2021,72(2):886-899

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Chitosan-Alginate Biocomposite Containing Fucoidan for Bone Tissue Engineering     

Jayachandran Venkatesan  Ira Bhatnagar  Se-Kwon Kim 《Marine drugs》2014,12(1):300-316

Over the last few years, significant research has been conducted in the construction of artificial bone scaffolds. In the present study, different types of polymer scaffolds, such as chitosan-alginate (Chi-Alg) and chitosan-alginate with fucoidan (Chi-Alg-fucoidan), were developed by a freeze-drying method, and each was characterized as a bone graft substitute. The porosity, water uptake and retention ability of the prepared scaffolds showed similar efficacy. The pore size of the Chi-Alg and Chi-Alg-fucoidan scaffolds were measured from scanning electron microscopy and found to be 62–490 and 56–437 µm, respectively. In vitro studies using the MG-63 cell line revealed profound cytocompatibility, increased cell proliferation and enhanced alkaline phosphatase secretion in the Chi-Alg-fucoidan scaffold compared to the Chi-Alg scaffold. Further, protein adsorption and mineralization were about two times greater in the Chi-Alg-fucoidan scaffold than the Chi-Alg scaffold. Hence, we suggest that Chi-Alg-fucoidan will be a promising biomaterial for bone tissue regeneration.  相似文献   

Nitrogen Dynamics Under Long Term Lantana Camara (L.) Residue and Fertilizer Application in a Rice-Wheat Cropping System     

Sandeep Sharma  T. S. Verma 《Journal of plant nutrition》2014,37(11):1804-1816

Long term effects of lantana (Lantana camera L.) residue and fertilizer application were studied on nitrogen (N) fractions in a Typic Hapludalf under rice-wheat cropping at Palampur, India (32°6’N, 76°3’E). After 12 crop cycles, lantana and fertilizer application showed an additive effect on the buildup of different N fractions. Hydrolyzable-N constituted 86% of total organic-N and 84% of total-N. All fractions of N except unidentified-N, non-hydrolyzable-N, and total-N were strongly interdependent and had a positive influence on grain yield and N uptake in rice and wheat crops. Serine+threonine-N was the most important fraction contributing towards grain yield and N uptake in rice and wheat. Fertilizers at 66% of recommendation plus lantana at 10 t ha^?1 maintained higher available-N than that under 100% fertilizers alone; the N content was same as 12 years before. Inclusion of lantana indicated net saving of 33% fertilizers plus higher yields and sustained soil health.  相似文献   

Rice residue incorporation and nitrogen application: effects on yield and micronutrient transformations under rice–wheat cropping system     

Sandeep Sharma  S. S. Dhaliwal 《Journal of plant nutrition》2020,43(18):2697-2711

Abstract

Despite being a major domain of global food supply, rice–wheat (RW) cropping system is questioned for its contribution to biomass burning in Indo-Gangetic Plains (IGP). Enhancing the yield and soil quality properties in this system is therefore necessary to reduce environmental degradation and maintain agricultural productivity. A field experiment evaluated the effects of soil management practices such as rice residue (RS) incorporation, and nitrogen (N) application on crop yield and micronutrients transformations in a RW cropping system of north-western India. The results revealed that N application (120?kg N ha^?1) and RS incorporation (7.5 t ha^?1) significantly increased micronutrients cations and crop yield compared with no-residue (RS₀). Irrespective of N application, crop grain yield under RS incorporation (Rs_7.5 t ha^?1) was significantly higher than RS₀ incorporation. Significant increase in all the micronutrient transformations was recorded in N₁₂₀/Rs_7.5 t ha^?1 compared with RS₀. Among different fractions, crystalline Fe bound in Zn, Mn, and Cu and amorphous Fe oxide in Fe fractions were the dominant fractions under N application (N₁₂₀) and RS incorporation (RS_7.5) treatment. Our study showed that application of N₁₂₀ followed by RS_7.5 can be more sustainable practice under RW cropping system for improvement in micronutrients availability and crop yield. This practice also provides an opportunity to incorporation of crop residues as an alternative to burning, which causes severe air pollution in the RW cropping system in the IGP.  相似文献