<strong>Brahamaputra</strong> <strong>Basin</strong> b) Assam - Dispur, northern Cachar hills and Karbi Anglong districts. c) Meghalaya - Eastern and western garo Hills, Jaintia Hills and eastern and western Khasi hills. d) Nagaland -Kohima, Mon, Mokokchung, Phek, Tuensang, Wokha and Zunheboto districts The agro-climate of the region is characterised by warm summers and cool winters. The mean annual precipitation varies from 2000 to 3000 mm which exceeds the PET demand in most of the months in a year, excepting the period of seasonal deficit. Length of growing period > 270 days.The area represents Udic soil moisture regime. The soil temperature regime varies from Hyperthermic in valleys to Thermic in higher topographic positions.The major soil formations in the area include shallow to deep, loamy, red and lateritic and red and yellow soils.The natural vegetation comprises wet evergreen and tropical moist deciduous forests. Jhum cultivation is common.Other major crops cultivated in this region are Rice, millets, potato, maize and sesame. Hilly terraces are used for plantation crops, such as tea, coffee, rubber and horticulture crops, like oranges, pineapple, etc. ii) Hot subhumid (moist) to humid (inclusion of perhumid) eco-regions with alluvial-derived soils (Agro-ecoregion - 15): Physiologically these agro-ecoregion comprising the plains pf the Brahmaputra River, covering parts of the States of Assam and West Bengal including the southern pockets of assam. States and districts under this ecoregion area. Assam - Cachar (Silchar), Darrang, Dibrugarh, Dhubri, Golaghat, Goalpara, Jorhat, Kamrup, Karimganj, non-tarai parts of Kokrajhar, Barpeta and Nalbari, Lakhimpur (north), Nalbari, Sibsagar and Sonitpur districs. b. West Bengal - Jalpaiguri (non-Tarai parts), Kochbehar. The climate of the area is characterised by hot summers and mild to moderately cool winters. The mean annual rainfall ranges from 1400-2000 mm, potential evapotranspiration is 1000–1400 mm. The length of growing period (LPG) > 210 days. The soil moisture and temperature regimes are udicustic (to Udic) and Hyperthermis, respectively. The common soil-scapes of the area are represented by level to very gently sloping Haplaquepts, Haplaqualfs, Dystrochrepts, Eutrochrepts, Fluvaquents, and Hapludalfs.The natural vegetation comprises tropical moist and dry deciduous forests. In view of the high rainfall, the cropping system is rice based. The main crops of rainy season (Kharif) grown under rainfed condition are rice and jute.In northern foothills of eastern Himalayas, plantation crops, such as tea and horticultural cropslike pineapple, citrus and banana are grown under favourable climatic conditions. Rice, jute, pulses, oilseeds (mustard) are grown on storesd/residual soil moisture in Rabi season. iii) Warm perhumid ecoregion with red and lateritic soils (Agro-ecoregion - 16): Physiologically the eastern Himalayan agro-ecoregion encompasses northern hilly parts of West Bengal, northern parts of Assam, Arunachal Pradesh and Sikkim states. The region occupies an area of 9.6 M. ha, represensting 2.9% of the total geographical area of the country. States and Districts under this ecoregion area) Arunachal Pradesh - Dibang Valley, eastern and western parts of Kameng, Lohit, easten Siang, western Siang, lower and upper subansiri districts. b) Assam -Tarai parts of Barpeta, Darrang, Kokrajhar and Nalbari districts. c) Sikkim - Eastern and western parts of Sikkim. d) West Bengal - Darjeeling and Tarai part of Jalpaiguri districts. www.india-wris.nrsc.gov.in 22
<strong>Brahamaputra</strong> <strong>Basin</strong> The climate of the region is characterised by warm summers and cool winters. The mean annual precipitation exceeds 2000 mm per annum. The area experiences short period of water stress during post-rainy period because of seasonal water deficit. The region has the longest LPG > 270 days in a year. The region is typified by Udic soil moisture regime. Potential evapotranspiration (PET) is 1000– 1100 mm. The soil temperature regime in the higher topography (> 1500 m) is Thermic, while on higher elevations (>3000 m) it is, in general, Mesic in most of Darjeeling, Sikkim Himalayas and Arunachal Pradesh. The lower elements of topography, like valley have Hyperthermic soil temperature regime.The dominant soils in the region, vary from shallow to moderately shallow, loamy, Brown Forests to deep, organic matter rich soils with moderate to low base status. The natural vegetation comprises subtropical pine forest and temperatate wer evergreen forests, subalpine forest, etc. Jhum cultivation is traditionally practised in this region.Another type of traditional practice is the cultivation of millets on upland terraces and potato, maize, millets and paddy in valley.In the hilly areas, vegetables and plantation crops are also grown on terraces. www.india-wris.nrsc.gov.in 23
Change language