TY  - BOOK
AU  - Naveed Shujauddin . 
AU  - Mohankumar B(Guide)
TI  - Productivity of ailanthus(ailanthus triphysa) and population densities
U1  - 634.9 
PY  - 2001///
CY  - Vellanikkara
PB  - Department of Sivilculture and Agroforestry, College of Forestry
N2  - A split plot experiment involving ailanthus (Ailanthus triphysa 
(Dennst.) Alston) at four population densities (3333,2500, 1600 an 1111 tpha) and 
four fertiliser regimes (0:0:0, 50:25:25, 100:50:50 and 150:75:75 kg N:P205:K20 
ha" yr") was initiated in June 1991. The objectives included evaluating the 
biomass production potential of ailanthus grown under different spacing and 
fertiliser regimes and estimating nutrient export through whole tree harvesting. 
Height, diameter and stand leaf area of ailanthus trees at 8.7 years of age 
was greater in the 2500 trees per hectare (tpha) stand than other density levels. 
Lower densities recorded higher biomass on a per tree basis whereas on a stand 
.basis, the high density stand (3333 tpha) showed greater biomass yield. Fertilisers 
applied at 1.2, 2.25 and 5.25 years had no significant effect on biomass 
accumulation. Regarding the partitioning of tree biomass, stemwood was the most 
important component in all density and fertiliser treatments while foliage 
contributed the least. Nonetheless, foliage registered the highest N, P and K 
concentration (%). NPK concentration of other fractions decreased in the order: 
branchwood > roots> stemwood. 
Nutrient accumulation (N, P and K) on a per tree basis was higher in the 
lower densities while on a stand basis, greater accumulation was noted in the 
higher density stands (3333 and 2500 tpha). Bole fraction accounted for only 56 
per cent of total nutrients removed during harvest. Thus leaving other biomass 
components (foliage and branches) at the site will greatly reduced the nutrient 
export associated with tree harvesting. 
Stands with 1600 and 1111 tpha showed higher N and K use efficiencies 
whereas for P, the tree population density of 2500 tpha 'showed the highest 
efficiency. Regarding fertiliser effect, trees in the control plot (no fertiliser) 
exhibited highest efficiencies for N, P and K. 
 
Available soil P, K and organic carbon concentrations declined with 
increasing tree population density. However, there was an overall increase in total 
N and available K levels compared to the previous. observation at 3 years of age. 
Increasing levels of fertilisers in general resulted in higher soil organic carbon, N, 
available P and K levels. 


UR  - http://krishikosh.egranth.ac.in/handle/1/5810104470
ER  -