H. Lal , Charan Singh , D. N. Puri , M. K. Vishwanatham

Abstract

A field experiment was conducted for nine years (1986-1995) to study the effect of plant spacing of Eucalyptus hybrid grown in association with Chrysopogon fulvus on plant growth, fresh and dry matter production and nutrients uptake of both tree and grass on degraded bouldery riverbed land of Do on Valley. It is evident from study that Eucalyptus hybrid planted at 3m x 1.5m spacing with Chrysopogon fulvus was found optimum with regard to plant growth, survival, dry matter production and nutrients uptake as compared to 3mx1m and 3mx3m spacings. Similarly, Chrysopogon fulvus grown alone exhibited better plant growth, produced relatively more fresh and dry fodder and improved the nutrients content and their uptake considerably than those grown with Eucalyptus hybrid planted at 3m x 1.5m and 3m x 1m spacings.

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Charan Singh , M. C. Agarwal , Nirmal Kumar , D. N. Puri

Abstract

The leaf production from Morus alba L. tree is fully appreciated in the hill region for rearing silkworm. The leaf can be obtained through various management practice. Since sporadic information is available on the production of leaves under various management practices which is required for optimum sustainable production without damaging the growth of the trees, studies on Morus alba were conducted to establish a suitable prediction model of leaf and total branch wood yield under three different management practices i.e. coppicing, pollarding and lopping on bouldery riverbed soils of Doon valley. The studies showed that the third degree polynomial was found to be most suitable prediction for leaf and total branch wood in all the three management practices. The leaf production was maximum under pollarding management practice while total branch wood yield was maximum under coppicing.

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S. K. Dhyani , D. N. Puri , P. Narain

Abstract

Above and below ground biomass production was estimated for Eucalyptus tereticornis Sm. Stands growing on deep textured soils and riverbed bouldery lands of Doon Valley. Above ground biomass production was 23.30 t ha^-1 On the deep soils and 20.83 t ha^-1 On the riverbed lands, while below ground production on these two sites was 7.51 t ha^-1 and 11.04 t ha^-1 Respectively. On the deep soils, 8.7% of total stand dry matter production was in fine ischolar_mains, in contrast to over 26% on the riverbed lands. However, the difference in total biomass production between the two sites was small (1.06 t ha^-1 ). The ischolar_main characteristics viz., depth, number, lateral spread, weight and percentage ischolar_mains in soils at the two sites were studied. It was observed that the development of the main ischolar_main is largely dependent on soil type. In deep heavy textured soil, Eucalyptus developed a sparsely branched and deeply penetrating ischolar_main system, while in riverbed bouldery lands a more compact intensively branched ischolar_main system was recorded. In riverbed bouldery lands due to presence of impediments, coiling of ischolar_mains was observed. A relationship between vertical ischolar_main length and total ischolar_main length to be known as "Coiling Factor" was established to compare coiling of ischolar_mains under different soil working depths.

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D. N. Puri , Pratap Narain , S. K. Dhyani

Abstract

Degraded bouldery river beds, occupying a sizable area of Doon Valley, support only scrub vegetation due to inherent physical and chemical soil Constraints. To rehabilitate such lands with Eucalyptus hybrid, an experiment was carried out (1982-86) on soil working (50, 75 and 100 cm deep pits or holes) filled with original half replaced and full replacement of excavated soil with good top soil. Results revealed that on an average l00 cm deep holes and pits produced 1.43 m and 1.83 m height and 1.58 cm and 2.18 dbh respectively. Although soil replacement showed better moisture regimes but did not significantly affect the growth. The ischolar_maining behaviour of 42 months plants showed more ischolar_main length, higher vertical to total length ratio in 100 cm deep pits and holes. The cost of wood was Rs.297/ m³ for holes and Rs.860/m³ for of pits 100 cm depth. Thus, 100 cm deep holes were found to be cheaper than pits and produced higher growth should be preferred for planting Eucalyptus hybrid.

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D. N. Puri , G. R. Gargya

Abstract

The studies on depth of soil working and soil amendments for successful establishment of Albizia lebbek on torrent land which has thin soil mantle over boulders and gravels of various sizes and shapes which constitutes 80% of the soil were carried out. Mixing of 30% partially decomposed leaf litter with excavated soil in holes show significantly superior growth in height as compared to refilling the holes with top soil (TS) and excavated soil (ES). The growth in holes of 50 cm depth was comparable with 100 cm depth holes refilled with top soil and mixture of leaf manure and excavated soil. The growth was 105 cm in 50 cm deep holes and 129 cm in 100 cm deep holes but were statistically at par at the age of 2 years. It is inferred that in torrent lands, 50 cm deep holes refilled with excavated soil and 30% mixture of partially decomposed leaf litter reduces the cost of soil working and gives good growth and establishment of Albizia lebbek.

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D. N. Puri , R. N. Kaul

Abstract

no abstract

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