Influence of defoliation and nitrogen fertilizer on compensatory growth of Eucalyptus spp. and Melia composita seedlings
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Date
2023
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Punjab Agricultural University
Abstract
The present investigations entitled, ―Influence of defoliation and nitrogen fertilizer on compensatory growth of Eucalyptus spp. and Melia composita seedlings‖ was performed in the main research farm of Department of Forestry and Natural Resources, Punjab Agricultural University, Ludhiana. In the present study, the seeds of Melia composita were germinated in polythene bags, whereas Eucalyptus (clone 413) was clonally propagated in the mist chamber and shifted to polythene bags containing Soil: FYM (2:1) as growing media. The seedlings were treated with defoliation (50%) and different doses of nitrogen (Control, 3g N, 6gN, 12g N/kg soil) and were evaluated for growth, biomass and physiological characters. The results revealed that Eucalyptus and Melia composita seedlings/plants supplied with 12g N/kg soil (3 split doses) treatment produced quality seedlings with higher values for all the growth and biomass characters. The seedlings of both the species also exhibited compensatory growth in response to defoliation treatment. The physiological parameters such as total chlorophyll and chlorophyll index in both the species were also observed higher in the seedlings/plants treated with 12g N/kg soil. Similarly, the higher survival percent and DQI index of Eucalyptus and Melia composita seedlings was observed higher in 12g N/kg soil treatment. Therefore, on the basis of overall mean performance and seedling quality indices, 12g N/kg soil fertilization treatment can be recommended for production of quality planting stock of Eucalyptus and M. composita species.
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Navpreet (2023). Influence of defoliation and nitrogen fertilizer on compensatory growth of Eucalyptus spp. and Melia composita seedlings (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.