Above ground biomass and nutrient uptake of three tree species (Eucalyptus camaldulensis, Eucalyptus grandis and Dalbergia sissoo) as affected by irrigation and fertiliser, at 3 years of age, in southern India

摘要

Seedlings of Eucalyptus camaldulensis, Eucalyptus grandis and Dalbergia sissoo were planted in a two-replicate split-plot factorial trial with four irrigation and three fertiliser treatments in Hosakote Forest station in southern India in September 1991. Irrigation was applied at the rate of 0, 2.5, 5 and 7.5 mm per day. Natural rainfall was approximately 800 mm per year distributed between June and November in two monsoon seasons. NPK fertiliser was applied three times in spade-slit dressings at 9, Is and 27 months from planting at a zero rate, a medium rate and a rate four times that. Over the life of the trial N was applied at the rate of 0, 80 or 320 kg/ha; P was applied at the rate of 0, 7.5 or 30 kg/ha and K at 0, 25 or 100 kg/ha.