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

Full Text

     

K. S. Sangha , P. S. Shera , G. P. S. Dhillon

Abstract

No abstract

Full Text

     

G. P. S. Dhillon , D. S. Sidhu

Abstract

A clonal trial was conducted by planting 17 poplar clones at village Dhindsa (Jallandhar) in central-plain region of Punjab. The data collected on diameter at breast height, tree height and volume per tree at 4, 6 and 8-year age were analyzed and genetic parameters were worked out. Significant differences among clones were noticed for all growth traits except for height at 6-year. No clone was significantly superior to control for any growth trait for age 4 and 6 year. Clone 'IN-CSb' was promising one with significantly higher volume(0.56)/m²/tree at 8-year age. The phenotypic and genotypic coefficients of variation were relatively low with maximum values for volume (27.17-32.13% and 7.96-10.46%) and the minimum for tree height (7.98-9.33% and 1.69-3.78%). The broad sense heritability and genetic advance were relatively higher at 8-year age.

Keywords

Heritability, Genetic Advance, Volume, Genetic Variation

Full Text

     

R. S. Dhanda , G. P. S. Dhillon , S. C. Sharma

Abstract

No reference on timber volume and biomass estimation of Leucaena leucocephala is available for Punjab State. The timber volume and weight tables for estimation of timber volume and above-ground biomass have been prepared based on destructive sampling of Leucaena trees for ready use by the tree growers, wood contractors, State Forest Department, researchers and plannners.

Full Text

     

G. P. S. Dhillon , R. S. Dhanda , M. S. Dhillon

Abstract

The effect of single scattered Acacia nilotica ssp. Indica (Kikar) trees on growth and yield of rainfed wheat was studied in North-western India. The biomass and grain yield of wheat were recorded at four distances from the base oftrees viz. I , 3 , 5 and 8 m on all the four aspects viz. northern , southern , eastern and western , and from open field (away from trees). Analysis of data revealed significant differences in biomass and grain yield with respect to aspect , distance from tree , and interaction of both. The least biomass and grain yields were recorded from southern aspect and from plots near to trees. When compared with open field , the association of tree caused 23.7 and 36.5 per cent reduction of biomass and grain yield , respectively. The highest reduction was recorded on the southern aspect for both grain (47.6%) and biomass yield (35.4%). The grain yield recorded at I and 3 m distance from the tree base were 49.8 and 46.8 per cent less , respectively than that of open field , whereas , at 8 m distance the reduction was comparatively less (14.3%). The biomass production also experienced lowest reduction (9.9%) at 8 m distance , however it was maximum (31.6%) at 3 m distance from base of tree.

Full Text

     

G. P. S. Dhillon , R. S. Dhanda , R. I. S. Gill , Pritpal Singh

Abstract

Populus deltoides is an important agroforestry tree species adopted by the farmers in North-West India. Though economic returns are comparatively better than rice-wheat rotation under wellmanaged conditions, poplar growers have suffered in recent past owing to their exploitation by the middlemen. The marketing is mostly done by grading of timber based on mid girth of logs as over-sized or under-sized logs. The present study was conducted in the central-plain region of Punjab, as existing timber volume and weight tables do not provide the information regarding proportion of over- or under-sized timber. The data on tree height, diameter at breast height was recorded on 83 randomly selected trees having girth at breast height (1.37 m from surface) ranging from 45 to 113 cm. The trees were felled and cut into logs of acceptable merchantable lengths. The data on log length, log girth (over and under bark) on both ends and at mid point, and log weight were recorded. The volume regression equations were developed on basis of diameter at breast height (DBH), and DBH and tree height. Further separate volume and weight tables were developed for over and under sized merchantable timber. These tables will be useful to the farmers, timber growers, wood contractors, state forest departments, research workers and the planners in their respective areas of concern for future plantation programmes.

Keywords

Populous deltoides, Timber Volume, Merchantable Volume

Full Text

     

Avtar Singh , O. P. Toky , G. P. S. Dhillon

Abstract

The study was conducted by transplanting one and half month old seedlings of six progenies, three each of Eucalyptus tereticornis and E. camaldulensis, in the pots filled with eight levels of artificially created soil salinity levels (ECe) i.e. control, 2, 4, 6, 8, 10, 12, and 14 dSm^-1. The experiment was conducted by following completely randomized design with three replications. The data on plant height, collar diameter and number of leaves per plant were recorded after 90 days of study. All the growth parameters of both the species recorded significant differences among salinity treatments. The maximum values were recorded in control and the lowest values were found at salinity level of ECe 14 dSm^-1 . Significant genetic variation was noticed in both the species for all the growth parameters. E. camaldulensis recorded significantly higher growth traits than respective values of E. tereticornis.

Keywords

Eucalyptus Tereticornis, E. Camaldulensis, Salinity, Genetic Variation, Growth Traits

Full Text

     

Ashok Kumar ¹, G. P. S. Dhillon ¹

Affiliations
1 Department of Forestry and Natural Resources, Punjab Agricultural University, Ludhiana, 141 004, IN

Abstract

The present study was carried out to estimate the genetic variability, heritability and genetic advance in clones of Eucalyptus spp. at Punjab Agricultural University, Ludhiana, Punjab (India). Significant differences were found among the clones for growth, number of branches and tolerance to gall wasp. The estimates of phenotypic and genotypic coefficients of variation clearly reflected large amount of variation for volume index and number of galls, and reasonable amount of genetic variability for plant height, collar diameter and number of branches. High heritability with high genetic advance as percentage of mean clearly suggested the potentiality of the clonal material for the improvement of plant height and volume index through selection. Significant positive correlations were recorded for all characters except number of galls. Path analysis revealed that plant height and collar diameter had high and positive direct and indirect effect, whereas, number of branches and number of galls had negative direct and indirect effect on volume index.

Keywords

Eucalyptus Clones, Variability, Heritability, Genetic Gain, Path Analysis.

Full Text