Bimlendra KumariTarun Kumar2019-08-072019-08-072019http://krishikosh.egranth.ac.in/handle/1/5810119846The present investigation entitled “Biomass and nutrient dynamics in Eucalyptus based agroforestry system as affected by tree spacing” was carried out in research area of Forestry Department, CCS Haryana Agricultural University, Hisar during 2014-15 and 2015-16. The study was conducted with the objectives to evaluate the effect of different spatial arrangements (3×3 m, 6×1.5 m and paired row 17×1×1 m) on growth and nutrient budget of Eucalyptus in terms of height and Diameter at breast height (DBH) under different spacings showed a rising trend with advancement of age. The height of Eucalyptus after seven and eight years of age was observed at par for 3×3 m and 6×1.5 m spacings, while it varied significantly for other 17×1×1 m spacing combinations in both the years under agroforestry system. However, the Current Annual Increment (CAI) for DBH was significantly more under 3×3 m spacing than other spacings but it was observed at par for 6×1.5 m and 17×1×1 m spacings. The CAI for height, DBH and canopy width were affected significantly at 5% level of significance. CAI for height and DBH were significantly higher in a spacing of 3×3 m in comparison to other spacings. The CAI for crown width was significantly higher in spacing of 6×1.5 m but it was found at par for 3×3 m and 17×1×1 m in the both the years. There was a significant amount of variation between the litter fall patterns under different spacings of Eucalyptus during summer, winter and rainy season. The maximum amount of litter fall was observed in 3×3 m spacing during winter season. Highest decomposition rate was observed July-August followed by June-July. The decomposition rate was stimulated with high temperature and high humidity during rainy season. The maximum N, P and K were added in 6×1.5 m spacing followed by 17×1×1 m spacing and minimum added nitrogen was found in 3×3 m spacing. N, P and K uptake 17×1×1 m, 6×1.5 m and 3×3 m respectively. The maximum N, P and K balance was observed in 3×3 m spacing followed by 6×1.5 m spacing and 17×1×1 m spacing.ennullThesis