G. P. S. Dhillon , D. S. Sidhu , B. Singh , A. Singh

Abstract

The present study was conducted at Punjab Agricultural University, Ludhiana (Punjab) by raising 11 progenies of plus trees of Melia azedarach under nursery and field conditions. The differences among progenies for collar diameter and plant height were significant at nursery stage. The plant height and diameter at age of 1, 3.5, 5 and 7 year also varied significantly among progenies. The heritability was observed to be medium for diameter (40.76 to 85.08 %) and height (52.07 to 76.25 %). The genetic gain and variation coefficients for diameter were also relatively higher under field conditions. The results indicated good potential for improvement for growth traits by collecting seeds from plus trees or seed orchards.

Keywords

Melia azedarach, Genetic Variation, Open Pollinated Progeny, Heritability, Genetic
Gain, Selection

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M. V. Durai , P. K. Ralhan , R. Sharma , A. Singh , S. Chauhan

Abstract

The study was carried out at farmers fields to quantify nutrient harvest through biomass of pruned material of 2, 3, 4, 5 and 6 year old plantations and whole tree of Populus deltoides Bartr. (Poplar). The pruned biomass was 327.4, 426.96, 986.27, 1,234.91 and 1,558.59 kg ha^-1 at 2, 3, 4, 5 and 6 year old plantations respectively. The total biomass of branches, main stem and ischolar_main of poplar at exploitable age was 48,96, 89,144, 94,040 and 12,280 kg/ha, respectively. Nutrient concentration was increased from basal segment to terminal segment of pruned braches and decreased with size of the branches. The nutrient harvest through pruned biomass was 46.32 kg ha^-1 N, 6.92 kg ha^-1 P and 19.93 kg ha^-1 K whereas nutrient loss through whole tree was 652.8 kg ha^-1, 75.84 kg ha^-1 P and 719.84 kg ha^-1 K. As the nutrient is exceeded than annual return, additional doses of fertilizers may be required to maintain soil fertility and productivity of the system.

Keywords

Nutrient Harvest, Populus deltoides, Agri-Silviculture System, Punjab

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P. C. Pandey , A. Singh , D. C. Karnatak , B. K. Bhartari

Abstract

Melampsora larici-populina, an internationally known damaging foliar rust of poplars, has been dealt with in detail with regard to its current status in the country as an immigrant pathogen of concern, taxonomy, damage and control in the nursery. Foliar application of Bayleton (0.08%) has been found to be most effective in controlling the rust infection.

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Bakhshish Singh , I. P. Pradhan , A. Singh

Abstract

An experiment comprising of six treatments based on combination of three types and two times of mulching and four replications was conducted during 1967-1972 at the Soil Conservation Researeh Station, Vasad (Gujarat) to study their effect on comparative success and cost of afforestaion in a semi-arid ravinous tract. The results show that clod mulching (Soil hoeing without pulverisation and spreading clods on the surface in one meter diameter around plants) in post-monsoon period (October) gave significantly better height and diameter growth of khair (Acacia cateshu) plants as compared to grass mulching or the usual weeding and hoeing. Clod mulching in October also gave higher survival % of the plants and was overall cheaper in cost than the prevalent practice of weeding and hoeing.

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A. Singh , C. M. Shah , H. K. Kamannavar

Abstract

Sixteen years of rainfall data of self recording raingauge available at Soil Conservation Research Demonstration and Training Centre, Vasad (Gujarat) have been analysed with regard to its erosivity. Average annual erosivity indicated in the form or EI₃₀ and KE>25 mm was found as 519.3 and 7509.EI₃₀ values have been discussed on weekly basis for the months of June, July, August and September in relation to hazards responsible for soil erosion.

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V. Chandra , Basant Singh , A. Singh , L. D. Kapoor

Abstract

Solanum khasianum Clarke, grown during July 1968 to May 1969 at N.B.G. Lucknow shows the development of maximum solasonine content in fruits when the plants are 9 to 10 weeks old by which time fruits change the colour from green to yellow. There is a sharp decline in the Solasonine contents if the fruits are allowed to mature beyond the yellow colour stage. Observations on flower to fruit development have also been recorded.

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A. Singh , C. M. Shah , Rajbans Dayal

Abstract

Fourteen years rainfall data of self recording raingauge available at Soil Conservation Research Demonstration and Training Centre, Vasad have been analysed and discussed in this paper. Average annual rainfall at Vasad is 826 mm with average number of forty rainy days. It has been found that over 97 per cent of rainfall is received in the months from June to September. Probability and frequency analysis of the rainfall data have also been done and are reported for tentative use.

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