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Dutta, S. K.
- Spatial Variability in Temporal Trends of Precipitation and its Impact on the Agricultural Scenario of Mizoram
Abstract Views :220 |
PDF Views:118
Authors
S. Saha
1,
D. Chakraborty
2,
B. U. Choudhury
2,
S. B. Singh
1,
N. Chinza
3,
C. Lalzarliana
4,
S. K. Dutta
1,
S. Chowdhury
1,
T. Boopathi
1,
Lungmuana
1,
A. R. Singh
1,
S. V. Ngachan
2
Affiliations
1 ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 ICAR Research Complex for NEH Region, Umiam 796 103, IN
3 Directorate of Economics and Statistics, and Government of Mizoram, 796 001, IN
4 Directorate of Crop Husbandry, Government of Mizoram, 796 001, IN
1 ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 ICAR Research Complex for NEH Region, Umiam 796 103, IN
3 Directorate of Economics and Statistics, and Government of Mizoram, 796 001, IN
4 Directorate of Crop Husbandry, Government of Mizoram, 796 001, IN
Source
Current Science, Vol 109, No 12 (2015), Pagination: 2278-2282Abstract
Long-term monthly rainfall observations (1986-2014) were analysed for 12 rain-gauge stations installed at variable altitudes of Mizoram. Our objective was to assess the temporal change in the standardized precipitation index (SPI) values at different timescales using Mann-Kendall trend tests. Significant reductions in post-monsoon and winter rainfall were recorded for most of the sites. Increasing dryness during the winter months may intensify the acute water shortage in Mizoram. Our results emphasize the altitudinal insensitivity of mean monthly rainfall trend and prove the urgent need for adopting suitable water management practices to cope with the water scarcity problem to increase the resiliency of rabi agriculture in Mizoram in near future.Keywords
Agriculture, Rainfall Pattern, Standardized Precipitation Index, Spatial Variability.References
- Das, A., Ghosh, P. K., Choudhury, B. U., Patel, D. P., Munda, G. C., Ngachan, S. V. and Chowdhury, P., Climate change in northeast India: recent facts and events – worry for agricultural management. ISPRS Archives XXXVIII-8/W3 Workshop Proceedings: Impact of Climate Change on Agriculture, 2009, pp. 32–37.
- Ravindranath, N. H. et al., Climate change vulnerability profiles for North East India. Curr. Sci., 2011, 101(3), 384–394.
- Jhajharia, D., Shrivastava, S. K., Sarkar, D. and Sarkar, S., Temporal characteristics of pan evaporation trends under the humid conditions of northeast India. Agric. For. Meteorol., 2009, 149, 763–770.
- Jain, S. K., Kumar, V. and Saharia, M., Analysis of rainfall and temperature trends in northeast India. Int. J. Climatol., 2013, 33(4), 968–978.
- Saikia, U. S. et al., Shift in monsoon rainfall pattern in the North Eastern region of India post 1991. J. Agrometeorol., 2013, 15(2), 162–164.
- WMO, Standardized Precipitation Index User Guide. (eds Svoboda, M., Hayes M. and Wood, D.) WMO-No. 1090, World Meteorological Organization, Geneva, Switzerland, 2012, pp. 8–24.
- McKee, T. B., Doesken, N. J. and Kleist, J., The relationship of drought frequency and duration to time scales. In Proceedings of the IX Conference on Applied Climatology. American Meteorological Society, Boston, MA, 1993, pp. 179–184.
- Naresh Kumar, M., Murthy, C. S., Sesha Sai, M. V. R. and Roy, P. S., On the use of Standardized Precipitation Index (SPI) for drought intensity assessment. Meteorol. Appl., 2009, 16, 381–389.
- Jha, S., Sehgal, V. K., Raghava, R. M. and Sinha, M., Trend of standardized precipitation index during Indian summer monsoon season in agroclimatic zones of India. Earth Syst. Dyn. Discuss., 2013, 4, 429–449.
- Breeding and Nesting Behaviour of Rhacophorus maximus (Anura:Rhacophoridae) in Meghalaya, North East India
Abstract Views :305 |
PDF Views:93
Authors
Affiliations
1 Department of Zoology, Shillong College, Shillong 793 003, IN
2 Department of Zoology, North Eastern Hill University, Shillong 793 022, IN
3 Nature Environment and Wildlife Society, Angul 759 123, IN
1 Department of Zoology, Shillong College, Shillong 793 003, IN
2 Department of Zoology, North Eastern Hill University, Shillong 793 022, IN
3 Nature Environment and Wildlife Society, Angul 759 123, IN
Source
Current Science, Vol 110, No 6 (2016), Pagination: 1102-1105Abstract
The present study deals with the breeding and nesting behaviour of Rhacophorus maximus at Cherrapunjee and Mawsynram, Meghalaya, North East India. Breeding activity of R. maximus occurred after the first few showers of rain and an increase in air temperature. The species breeds sporadically for a short period, which lasts for about 6-8 weeks during March and April. Amplexus took place on land as well as in water and lasted for several hours. Aggregations of male frogs making advertisement call at the breeding sites have been observed. Competition among the males to mate with the female frogs and at the same time trying to dislodge the amplecting pairs have also been observed. Multiple amplecting pairs are seen in the temporary rainfed pond at Mawsynram, which appeared to be a congenial breeding habitat during the peak of the breeding period. Both male and female frogs took active part in nest construction. The species constructs foam nests on diverse substrata such as aquatic vegetation about 2-3 cm above the water surface, on bare rocks near the water bodies and on earthen banks. The water temperature recorded during oviposition ranged from 20°C to 22.5°C, air temperature from 21.5°C to 26°C and relative humidity from 65% to 99%. The eggs are large, measuring 2 mm in diameter, unpigmented, white in colour and clutch size varies between 809 and 2059 with a mean of 1351.96 ± 83.07.Keywords
Aggregation, Amplecting Pairs, Breeding, Foam Nest, Rhacophorus maximus.References
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- Biju, S. D., A novel nesting behavior of a treefrog, Rhacophorus lateralis in the Western Ghats, India. Curr. Sci., 2009, 97(3), 433– 437.
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- Multi COB-Bearing Popcorn (Puakzo) Maize:A Unique Landrace of Mizoram, North East, India
Abstract Views :374 |
PDF Views:83
Authors
A. Ratankumar Singh
1,
S. B. Singh
2,
S. K. Dutta
3,
T. Boopathi
1,
Lungmuana
4,
S. Saha
4,
M. Thoithoi Devi
4,
N. Hemanta Singh
1
Affiliations
1 Division of Crop Protection, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 Division of Social Science, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
3 Division of Horticulture, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
4 Division of Natural Resource Management, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
1 Division of Crop Protection, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 Division of Social Science, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
3 Division of Horticulture, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
4 Division of Natural Resource Management, ICAR-Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
Source
Current Science, Vol 110, No 8 (2016), Pagination: 1392-1393Abstract
Mizoram is a mountainous (Lushai hill range) state with closely spaced intermountain valleys, demographically dominated by indigenous tribes (Mizo) constituting 94.4% of the total population. These tribal populations ensure the conservation of plant genetic resources for the future, for the food and nutritional security of an increasing population. Since 1976, in the northeastern hill region intensive collections of maize landraces were made by ICAR-NBPGR, New Delhi and diversity of landraces maize from this region comprised 36% of the total collection from whole India, which was the highest number of accession among other regions.- Occurrence, Severity and Association of Fungal Pathogen, Botrydiplodia theobromae with Sudden Death or Decline of Tree Bean (Parkia timoriana, (DC.) Merr) in North Eastern India
Abstract Views :317 |
PDF Views:113
Authors
A. Ratankumar Singh
1,
S. K. Dutta
1,
S. B. Singh
1,
T. Boopathi
1,
S. Lungmuana
1,
S. Saha
1,
Vishambhar Dayal
1,
Romila Akoijam
2,
S. K. Sharma
2,
N. Hemanta Singh
2
Affiliations
1 ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 ICAR Research Complex for NEH Region, Manipur Centre, Lamphelphat 795 004, IN
1 ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 ICAR Research Complex for NEH Region, Manipur Centre, Lamphelphat 795 004, IN
Source
Current Science, Vol 115, No 6 (2018), Pagination: 1133-1142Abstract
Tree bean, Parkia timoriana is one of the most important perennial tree legume vegetable crops in north eastern region (NER) of India. Recently, sudden death or decline is emerging as a major constraint in the production of tree bean. The prevalence, intensity and etiology of this disease have not been extensively studied. The present work was aimed at studying the symptomology, severity and etiology of sudden death or decline of tree bean in the north eastern region of India. Typical symptoms of tree bean decline were initiated with wilting of half portion of the tree, excessive shedding of leaves, gradual drying up leading to death, and secondary infestation by insects on dead trees. The highest disease severity of 68.5% was observed in warmer regions like Kolasib, Mizoram. During survey, small bark borer was recorded in all districts and levels of infestation rate (holes/ft2 of log) reached maximum up to 25.49 in Hnanthial of Lunglei district. Young trees in the range 1–10 years with 57.32% (917 trees) of total trees (1600) infected were most susceptible to the disease compared to 12.58% (201 trees) infection in old trees in the range 21–30 years. The frequently associated pathogen with sudden death or decline of tree bean was identified as Botrydiplodia theobromae at the Indian Type Culture Collection, ICAR-IARI, New Delhi. It was the most aggressive species and proven to be pathogenic to tree bean following artificial inoculation.Keywords
Botrydiplodia theobromae, North Eastern India, Parkia timoriana, Sudden Death or Decline Disease, Tree Bean.References
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- Unique Breeding Activity and Oviposition in Annandale’s High-Altitude Tree Frog, Kurixalus naso (Annandale, 1912) in Meghalaya, North East India
Abstract Views :270 |
PDF Views:67
Authors
Affiliations
1 Department of Zoology, North Eastern Hill University, Shillong 793 022, IN
2 Nature Environment and Wildlife Society, Angul 759 123, IN
1 Department of Zoology, North Eastern Hill University, Shillong 793 022, IN
2 Nature Environment and Wildlife Society, Angul 759 123, IN
Source
Current Science, Vol 118, No 3 (2020), Pagination: 467-472Abstract
The present study highlights the unique characteristics of the breeding activity and oviposition of Annandale’s high-altitude tree frog, Kurixalus naso (Annandale, 1912) at Mawsynram, Meghalaya, North East India. After the cold, dry, winter months (September– January), the first rainfall in February triggers the onset of a short breeding activity of the species, which lasts for 3–4 weeks during February to March. The first shower causes an increase in soil moisture content and decrease in soil temperature. Immediately after the first showers, males make their advertisement calls, followed by females engaging in amplexus with the males and ovipositing in the moist soil. The females come only once to the breeding site and leave after mating; parental care is provided by the males. Multiple amplecting pairs at the breeding site are seen inside the burrows and some are observed to amplect in the open soil surface, lasting for 5–6 h. No aggregation and competition among the males is observed. The amplecting females lay eggs inside the excavated burrows and the males, using their hind limbs, expose the eggs by pushing them to the mouth of the burrowing hole. Sometimes, the females oviposit at the base of hollow tree trunks and occasionally in the open soil surface. The eggs are mixed with the soil and they resemble perhaps masquerade as seeds. Most frogs display a biphasic life cycle. However, K. naso shows a distinct non-aquatic oviposition with aquatic larva. Further, soil moisture content and temperature may support the development of embryos in open soil surfaces and burrows.Keywords
Amplexus, Breeding, Burrows, Kurixalus naso, Oviposition.References
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