V. K. Dwivedi , K. S. Dadhwal , B. Haldorai

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C. Venkataramanan , B. Haldorai , P. Samraj , S. K. Nalatwadmath , C. Henry

Abstract

StudIes on the chemical composition and total quantity of the leaf-litter from the Eucalyptus globulus and Acacia mearnsii plantations have been worked out. Eucalyptus globulus (Bluegum leaf-litter in the Nilgiris in Tamil Nadu adds annually 1935 kg/ha of litter ((Oven dry wt.) which by way of nutrients works out to annual addition of 31 kg N/ha, 0.8 kg P/ha, 4.3 kg K/ha, 18.8kgCa/ha, 21 kg Mg/ha in addition to 1548 kg organic matter/ha. Acacia mearnsii (Black wattle) leaf litter adds annually 960 kg/ha of litter (Oven dry wt ) which by way of nutrients work out to annual addition of 22.1 kg N/ha, 0.5 kg P/ha, 3.4 kg K/ha, 3.3 kg Ca/ha, 0.9 kg Mg/ha. In addition to 662 kg Organic matter/ha, containing all important micro-nutrients. Recycling of nutrients in the above plantation keeps the land under high fertility status, with rich top soil and dense vegetation. Thus there will be no problem of erosion in protected Bluegum and Black wattle plantations. A comparison of nutrients added by the leaf-litter of Shola with that of Bluegum and Black wattle plantation revealed that the leaf-litter of Shola contained higher percentage of nutrients (especially that of Nitrogen, Potassium, Calcium and Organic matter) than that of Bluegum or Black wattle.

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P. Sambaj , S. Chinnamani , B. Haldorai

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The paper present the results of investigations on run-of soil loss accumulation of leaf litter and timber yield under native vegetation cover and under plantation of Eucalypius globulus (blue-gum) employing runoff plots. It has been concluded that there was not much difference in runoff between different forest covers though a mixed plantation of blue-gum and black wattle (Acacia mearnsii) gave less run-off Litter production was nearly the same (2.315 tonns/ha/yr) in both native "Shola" forests and Eucalyptus plantations. Mixed plantion of blue-gum and wattle is preferable to pure plantation both from ehe point of view of timber production and soil and water conservation.

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P. K. Thomas , K. Chandrasekhar , B. Haldorai

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A new method has been evolved to estimate the annual transpiration loss from a plantation of blue gum in the Nilgiris. The value is 3475 tonnes/ha of plantation, which works out to 34.75 cm out of a total rainfall of about 130 cm. The transpiration ratio works out to 1:235. It has been concluded that planting up of the highland watersheds of the Nilgiris, will not very much adversely affect, the water yield, to the existing reservoirs.

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