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Chatterjee, Dibyendu

Validation of Traditional Weed Control Method through Common Salt Application in the Hill Region of Nagaland

Abstract Views :258 | PDF Views:67

Authors

Dibyendu Chatterjee ¹, Rakesh Kumar ¹, Rukuosietuo Kuotsu ¹, Bidyut C. Deka ¹

Affiliations
1 Indian Council of Agriculture Research, Research Complex for North Eastern Hill Region, Nagaland centre, Jharnapani, Medziphema 797 106, IN

Source

Current Science, Vol 110, No 8 (2016), Pagination: 1459-1467

Abstract

Traditionally, common salt (NaCl) is applied to control broadleaved weeds under shifting cultivation in Nagaland. The aim of the present study was to find out whether such practice is harmful to the soil. For this, an experiment was conducted on upland rice with 12 treatments, viz. control, weedy check and different doses of NaCl from 20 to 200 kg ha^-1. Soil samples were collected at several phases of shifting cultivation and analysed for organic carbon, available N, P, K, pH, electrical conductivity (EC), cation exchange capacity, exchangeable sodium percentage and sodium adsorption ratio. Yield and yield attributing characters were measured and economics was computed. The results revealed that soil organic carbon (SOC) increased after harvest, but decreased after one year. In contrast, available N, P and K decreased during the crop growth and post harvest period. Weedy check followed by an application of 100 kg NaCl ha^-1 realized the highest gross and net returns. It was observed that NaCl did not exert an undesirable influence on pH, SOC and available NPK; however, EC increased for a short time. The results were confirmed by the verification trial. The yield of rice was highest in 100 kg NaCl ha^-1 treatment among the treated plots. Hence, this may be recommended to control weeds under shifting cultivation.

Keywords

Common Salt, Direct-Seeded Rice, Indigenous Technical Knowledge, Shifting Cultivation, Weed Control.

Full Text

Does Rise in Temperature Adversely Affect Soil Fertility, Carbon Fractions, Microbial Biomass and Enzyme Activities under Different Land Uses?

Abstract Views :215 | PDF Views:79

Authors

Dibyendu Chatterjee ¹, Rukuosietuo Kuotsu ¹, Merasenla Ao ¹, Saurav Saha ², Sanjay Kumar Ray ¹, S. V. Ngachan ³

Affiliations
1 Indian Council of Agricultural Research, Research Complex for North Eastern Hill Region, Nagaland Centre, Jharnapani, Medziphema 797 106, IN
2 Indian Council of Agricultural Research, Research Complex for North Eastern Hill Region, Mizoram Centre, Kolasib 796 081, IN
3 Indian Council of Agricultural Research, Research Complex for NEH Region, Umiam 793 103, IN

Source

Current Science, Vol 116, No 12 (2019), Pagination: 2044-2054

Abstract

We studied the variable dynamic response of different soil properties under the exposure of three elevated temperature treatments on six land-use systems. After one month of incubation, the associated changes were measured in terms of soil fertility, carbon, microbial biomass and soil enzymes. Our results confirmed the significant increase (P < 0.05) in soil available nitrogen content (by 1.85–49.32 %) with the subsequent rise in incubation temperature for soils collected from orchards and agriculture land uses. We observed a steady decrease in total organic carbon (TOC) levels with increase in incubation temperature varying between 4.1% and 31.4% (P < 0.05) across different soil types and land-use systems, resulting in a significant rising trend for microbial biomass carbon and labile carbon : TOC ratio up to 3°C elevation from maximum temperature. Among the soil enzymes, dehydrogenase, fluorescein diacetate hydrolase and β-glucosidase activity increased significantly with increase in incubation temperature from the ambient temperature, while acid phosphomonoesterase and arylsulphatase activity decreased. Our current research findings will provide new insights regarding temperature control on soil C dynamics and nutrient availability in terms of modified soil enzyme activity that will be useful to model the dynamics of soil organic matter and associated nutrient availability in acid soils.

Keywords

Carbon, Land Use, Microbial Biomass, Soil Enzyme Activity, Temperature Effects.

Full Text

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Extreme Temperature and Rainfall Event Trends in the Middle Gangetic Plains From 1980 to 2018

Abstract Views :82 | PDF Views:58

Authors

S. Vijayakumar ¹, Sudhir Kumar Rajpoot ², N. Manikandan ³, R. Jayakumara Varadan ⁴, J. P. Singh ², Dibyendu Chatterjee ⁵, ‪Sumanta Chatterjee ⁶, Santosha Rathod ⁷, Anil Kumar Choudhary ⁸, Adarsh Kumar ⁹

Affiliations
1 ICAR-Indian Institute of Rice Research, Hyderabad 500 030, India; ICAR-National Rice Research Institute, Cuttack 753 006, India., IN
2 Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221 005, India., IN
3 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad 500 059, India., IN
4 ICAR-Central Island Agricultural Research Institute, Port Blair, Andaman & Nicobar Islands 744 101, India., IN
5 ICAR-National Rice Research Institute, Cuttack 753 006, India., IN
6 University of Wisconsin-Madison, Madison, WI 53706, USA., US
7 ICAR-Indian Institute of Rice Research, Hyderabad 500 030, India., IN
8 ICAR-Central Potato Research Institute, Shimla 171 001, India; ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India., IN
9 ICAR-National Bureau of Agriculturally Important Microorganisms, Mau Nath Bhanjan 275 103, India., IN

Source

Current Science, Vol 124, No 11 (2023), Pagination: 1300-1307

Abstract

Regional-level studies aimed at identifying and assessing various types of extreme weather events and comprehending their effects on various sectors are crucial. In the present study, we have utilized the RClimDex software to compute the trend in temperature and precipitation extreme events in the Varanasi district of Uttar Pradesh, India, from 1980 to 2018. We employed both Mann–Kendall test and linear regression to test the statistical significance of the computed trend. Out of 13 temperature indices, 8 showed a significant trend while the remaining showed a non-significant trend. The annual mean maximum temperature, warm days, diurnal temperature range and a monthly minimum of maximum temperature had decreased significantly by 0.029ºC, 0.159 days, 0.032ºC and 0.122ºC/yr respectively, whereas cool days and cold spell duration had increased significantly by 0.264ºC and 0.372 days/yr respectively, indicating an increased cooling effect over the study area. Similarly, out of the 11 rainfall indices, only two showed a significant trend, while the remaining showed a non-significant trend. The increasing drought over the study area is evident as the number of rainy days and consecutive wet days have decreased significantly by 0.262 days and 0.058 days/yr respectively, with a non-significant increase in consecutive dry days during the same period. The weak negative non-significant trend of a maximum of five consecutive days of rainfall, very heavy rainfall days and total annual precipitation indicate the decreasing trend of floods. This study stresses the development of adaptation plans to overcome the adverse consequences of extreme weather events in Varanasi district.

Keywords

Adaptation Plans, Climate Change, Extreme Weather Events, Temperature and Rainfall, Statistical Significance, Trends.

Full Text

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