Fuelwood Species
The tree is commonly found on alluvial ground along streams, and in moist even swampy places. It is particularly common in low lying moist Savannahs.
The species is found in the sub-Himalayan tracts from Yamuna eastwards to West Bengal, Satpura range, Gujarat, South India and in the Andamans. It has good adaptability for growing in moist as well as fairly drought conditions. The tree is classed as a light demander although it stands moderate shade in the pole stage. It is fairly drought resistant but frost-tender. It produces root suckers when the stem is mutilated or the tree becomes old.
Albizia procera occurs in tropical semi-evergreen forests, tropical moist deciduous forests, dry tropical forests and northern sub-tropical broad-leaved forests. In the areas of its natural distribution, the absolute maximum shade temperature varies from about 36°C to 46°C, the absolute minimum from -1°C to 18°C and the normal annual rainfall from about 1,000-5,000 mm. Its common name is White Siris and trade name Safed Siris.
The tree belongs to family the Leguminosae, sub family Mimosoideae.
As a Plantation Tree
Being a fast growing species and having an immense potential
for introduction in different types of soils and climatic conditions,
it is planted in various states by the Forest Departments and also by
farmers under Agro-forestry programmes. This is an important fast
growing species in Assam and other eastern states, particularly
Tripura. It is also planted in Bihar and Uttar Pradesh. Albizia procera
has been used in experimental planting in saline and alkaline areas
with considerable success. Being a legume, it fixes nitrogen through
symbiotic bacteria present in root nodules and thus enhances and soil
fertility.
Planting Site and its Preparation
The species prefers alluvial soils although it also comes up
in clayey or moderately alkaline and saline soils, where it attains a
smaller size. The planting site is cleared of undesirable growth by
cutting and burning; 30 cm x 30 cm x 30 cm pits are dug before the
summer season. The soil gets weathered during the hot months. It is
also raised as a shade tree in tea gardens and planted in mine spoils.
Since the species is vulnerable to browsing by cattle etc. the
plantation areas have to be well protected generally by providing
barbed wire fencing.
Planting
Entire plants as well as stumps are generally put in
previously prepared planting pits with the break of the monsoon showers.
Small as well as large 1 year to 15 months old saplings can be
successfully planted depending upon the climatic conditions; success
with smaller plants is however, achieved in moist areas
Spacing
In Assam and North Bengal, in case of line sowing, 2-3 m
spacing between lines is adopted. The seedlings are spaced about 0.5 m
in the lines at the end of the first growing season. Spacing of 2m x 2m
or 3m x 3m are recommended for planting of entire transplants or
stumps. Around the agricultural fields the species can be planted in a
single row at 3m or 4 m spacing.
Mixed Plantations
In the tarai and bhabar tract of Uttar Pradesh, Safed Siris
has been raised by sowing in admixture with other species like khair,
sissoo, semal etc., in continuous ridges 4m apart. In areas subject to
strong wind it is mixed with other wind firm species in plantations. In
multi row strip plantations along roads, rail lines and canals, this
species is planted in the middle row.
Manuring
Application of 5 ml rhizobium broth and 75 g single super
phosphate per plant in the year of planting significantly increases the
growth and development, and establishment of plantation.
Irrigation
In moist localities irrigation is not done. However, in drier
and refractory sites, irrigation during summer months and winter, if
there are no rains, is needed for ensuring the survival as well as
better growth. As many watering as possible should be done. Mulching
has a very good effect in retention of moisture. In agroforestry
plantations watering may not be required as the plants get sufficient
moisture from the irrigation of agriculture crops. Where sufficient
moisture is not available the plants die-back during the first and
second year in summers, and resprout in the following rainy season.
Weeding
Three weedings are carried out in the first and second year
in high rainfall areas, elsewhere two in the first and second year and
one in third year, irrespective of whether the plantation is raised by
direct sowing, entire transplants or stumps. Climbers and bushes likely
to shade the plants are also cut. In the case of direct sowing,
thinning of the plants is done to reduce competition.
Cleaning and Thinning
These operations are carried out depending upon the development of the crop and its silvicultural requirements
Harvesting
Trees are generally harvested from December to May.
Collection of pods is done before they split on the tree otherwise the
fallen seeds are quickly infested and damaged by pests. For fodder, the
leaves are best collected from October to December when the
availability of foliage is maximum.
Marketing
Timber and fuelwood are main marketable products which are
sold in almost all the timber markets and fuelwood depots throughout
India. The wood is also used for making paper pulp and chipboards in
industries along with other species. Bark finds commercial use in the
tanning industry