Vinu Jacob
Foliar nutrient content and decomposition of green manure species viz. Gmelina arborea Roxb. and mallotus philippensis (Lam.) Muell. Arg. - Vellanikkara Department of Forest Management and Utilisation, College of Forestry 2014 - 108p.
MSc
A detailed work was undertaken in the College of Forestry, Kerala
Agricultural University, Vellanikkara, Thrissur, Kerala during 2011 - 2014 to
study the foliar nutrient content and the decomposition rate of the leaf biomass of
two green manure tree species, i.e. Gmelina arborea and Mallotus philippensis, as
affected by seasons and field conditions. The experiment was conducted in an
open and home garden during the wet season and the dry season.
The rate of decomposition was generally faster for both the species studied
under all the study situations. However, Gmelina arborea showed faster rates of
leaf biomass decomposition than Mallotus philippensis. With respect to seasons,
wet season reported faster decomposition for both the tree species. Although no
significant influence of field conditions on the decomposition rate was observed,
open area registered faster decomposition than homegarden. Decay coefficient
recorded was maximum for Gmelina arborea. Generally, both the species under
all the conditions followed a biphasic pattern of biomass decomposition. The
initial nitrogen content, C: N ratio, lignin content and lignin: nitrogen ratio of the
leaf biomass influenced the decomposition rate. The decomposition rate was also
found to be a function of soil moisture content and soil temperature.
Leaf biomass of Gmelina arborea showed rapid release of nutrients than
Mallotus philippensis. Among the nutrients, potassium registered faster
mineralization followed by nitrogen for both the species under all the study
situations. The lowest mineralization tendency was seen for phosphorus in both
the species under all the conditions. Also, significant improvement in the soil
nutrient status of the soil was observed by the incorporation of leaf biomass of
Gmelina arborea and Mallotus philippensis into the soil. However, no significant
differences were observed with regards to the species on increasing the soil
carbon and nitrogen content. The leaf biomass of Gmelina arborea showed
maximum improvement of soil phosphorus content and exchangeable potassium.
Forest Management and Utilization
634.9 / VIN/FO
Foliar nutrient content and decomposition of green manure species viz. Gmelina arborea Roxb. and mallotus philippensis (Lam.) Muell. Arg. - Vellanikkara Department of Forest Management and Utilisation, College of Forestry 2014 - 108p.
MSc
A detailed work was undertaken in the College of Forestry, Kerala
Agricultural University, Vellanikkara, Thrissur, Kerala during 2011 - 2014 to
study the foliar nutrient content and the decomposition rate of the leaf biomass of
two green manure tree species, i.e. Gmelina arborea and Mallotus philippensis, as
affected by seasons and field conditions. The experiment was conducted in an
open and home garden during the wet season and the dry season.
The rate of decomposition was generally faster for both the species studied
under all the study situations. However, Gmelina arborea showed faster rates of
leaf biomass decomposition than Mallotus philippensis. With respect to seasons,
wet season reported faster decomposition for both the tree species. Although no
significant influence of field conditions on the decomposition rate was observed,
open area registered faster decomposition than homegarden. Decay coefficient
recorded was maximum for Gmelina arborea. Generally, both the species under
all the conditions followed a biphasic pattern of biomass decomposition. The
initial nitrogen content, C: N ratio, lignin content and lignin: nitrogen ratio of the
leaf biomass influenced the decomposition rate. The decomposition rate was also
found to be a function of soil moisture content and soil temperature.
Leaf biomass of Gmelina arborea showed rapid release of nutrients than
Mallotus philippensis. Among the nutrients, potassium registered faster
mineralization followed by nitrogen for both the species under all the study
situations. The lowest mineralization tendency was seen for phosphorus in both
the species under all the conditions. Also, significant improvement in the soil
nutrient status of the soil was observed by the incorporation of leaf biomass of
Gmelina arborea and Mallotus philippensis into the soil. However, no significant
differences were observed with regards to the species on increasing the soil
carbon and nitrogen content. The leaf biomass of Gmelina arborea showed
maximum improvement of soil phosphorus content and exchangeable potassium.
Forest Management and Utilization
634.9 / VIN/FO