B. N. Hazarika
Central Agricultural University, India
B. N. Hazarika has completed his PhD at the age of 31 years from Indian Council of Agricultural Research, Umium, Meghalaya and Guwahati University. He has the experience of serving in ICAR Research Complex, Umium, Assam Agricultural University, Jorhat and Central Agricultural University, Imphal. He served as incharge Dean of the College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh and presently Head, Dept. of Fruit Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh. He has published more than 55 papers in reputed national and international journal having high impact factor.
The North Eastern region of India is regarded as one of the ‘Mega Biodiversity Hotspot’ in the world because of its diverse present of flora and fauna. This region stretches from 21° 57' N to 29° 28' N and from 89° 40' E to 97° 25' E, and is considered as one of the natural home of citrus. All the states of the region has lot of climatic variations because of its unique position in the Indian subcontinent. It has been blessed by nature with one of the richest flora and fauna on the earth. Its unique phytogeographical positions, topography and high degree of precipitation are some of the important factors which are mainly responsible for its enormous biological diversity. In a naturally cross pollinated genus like the citrus, nature has eventually created different forms of citrus and the region has the conducive environment, suitable soil and topography for perpetuation of these various forms. It can be regarded as ‘A live museum of Citrus’. The wide adaptability of citrus is also reflected in its general distribution of topographical situations. It also holds a unique position in the world map of Citrus occurrence and diversity and possess wide diversity of Citrus species either in cultivated or in wild form. About 17 species are found in North Eastern region of India and 8 species are indigenous to this region. There is every possibility to occur these citrus species as the states are a contiguity of Himalayan belt. The Khasi Mandarin of Arunachal Pradesh is unique in its quality. Other than the commercial species, some of other species of citrus namely Rough lemon, Kamala Australia, Samphola, Citron, Singkin, various Limes and Lemons, Pummelos, Grapefruit etc. are available in various types either in homestead or in forests. Due to changes in climaticcondition, the productivity of citrus shows decreasing trend over last few years. Many of the underutilized citrus species are in the verge of extinction due to various interventions. Considering the importance of the valuable citrus wealth of this region the emphasis has been laid on the collection and maintenance of the citrus species.