Chirang district is one of the four districts of Bodoland Territorial Area District (BTAD) under the Govt. of Assam, created vide notification No. GAG (B). 137/ 2002/ Pt/ 117 dtd. 30/10/2003 within Assam under Clause 6 of Article 332 by the 90th Amendment Act, 2003 of the Constitution of India under the provision of the Sixth Schedule. The district has been functioning with effect from 04th June, 2004. It was carved out of the districts of Kokrajhar, Bongaigaon and Barpeta. Kajalgaon is the district Headquarter. There are two Sub-Divisions in the district:
Kajalgaon Sadar Sub-Division
Bijni Civil Sub-Division
GEOGRAPHY
Topography:
The district has a plain topography. However, it has undulating areas and the northern parts of the district lying on the foothills of Bhutan have slightly higher elevation which is generally decreasing towards the southern parts of the district. The four types of soil are found in the district namely:
Entisols (recent alluvium)
Inceptisols (old alluvium)
Alfisols (mountain valley)
Ultisols (laterised red)
It is mostly acidic in nature. The organic carbon and available nitrogen of the soil mostly varies from medium to high, low in availability of P O and medium in K O status.
On the basis of information on physiography, soils, farming systems, crop and cropping systems and hydrological information, the district has been classified into 4 (four) agro-ecological situations which are as follows:-
Foothills old mountain valley
Flood-free riverine old alluvial plain
Flood-prone riverine alluvial plain
Beels
Location:
The district is located in the north-eastern Himalayan sub-region of India between 26.28 N and 26.54 N longitudes, and 89.42 E and 90.06 E latitude. Again, it is situated in the north-west side of Assam. Its distance from the state capital is 220 km.
Boundaries:
North ? Bhutan
South ? Bongaigaon district and a part of Kokrajhar district
East ? Baksa district and part of Barpeta district
West ? Kokrajhar district
Climate:
The district falls under Lower Brahmaputra Valley Agro-Climatic Zone. The climate of the district is sub-tropical in nature with warm and humid summer followed by dry and cool winter. The average annual rainfall is about 1900 mm per annum of which 75% is received during June and September. During Monsoon the climate is normally wet, and dry during winter. Both pre and post-monsoon months have unpredictable and erratic rainfall. The maximum and minimum temperature varies from 33o to 38o C and 9o to 10o C respectively. The average radiation is the highest during March to April while overcast sky reduces the solar radiation to the east during July.
Rivers:
Champamati, Aie and Manas rivers are flowing through the district from north (originating in Bhutan) towards south and have joined the mighty Brahmaputra river. Besides, there are many tributaries, small rivulets and streams flowing through the district.
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