Planting and use of Azadirachta excelsa in Ninh Thuan and Binh Thuan provinces

Abstract

Azadirachta excelsa (Jack) Jacob is a multiple used indigenous species in
the dry regions of South Central Coast of Vietnam. Azadirachta excelsa
(Jack) Jacob has been planted in Ninh Thuan and Binh Thuan province
recently. Results on asessment of plantation and use status of this species
provided scientific basis for the delvelopment of this species. Research
results showed that from 2005 to 2010, there were about 20 to 100ha of
Azadirachta excelsa (Jack) Jacob planted in Ninh Thuan province annually.
In Binh Thuan province, the species has not been planted porpularly. There
were only 11.5ha planted as experimental area for scientific purposes.
Azadirachta excelsa has been planted in various types of soil with nutrient
contents ranging from extremply poor to rich. Different planting techniques
are also applied to planting models. Average survival rate of the species are
90.76%, 97.73%, 95.91%, 62.58%, 79.5%, 81.6% at Ninh Son, Ninh Phuoc,
Song Sat, Nui Chua, Tuy Phong and Phan Thiet respectively. After planting
of 2-3 years, average stem diameter increment was 0.41-1.18 cm/year and
heigh increment was about 0.34 - 0.57 m/year. These indicators were 0.49 -2.17 cm/year and 0.18 - 0.97m/year respectively for the species after planting 5 - 7 years. Azadirachta excelsa (Jack) Jacob was unlikely planted
as forest in red sand areas. Wood of the species are maily used for
household items, seed and bark are used as materials for soap and dyeing
industries,... leaves and trash particles are used as pesticide Azadirachta
excelsa (Jack) Jacob forest plays important roles in protection, soil erosion
limitation, soil moist keeping and ecological environmental protection for
the region.