Informatics Publishing Limited

R. S. Dhanda , R. K. Verma

Abstract

Timber volume and weight tables have been prepared for Poplar P. deltoides, which is an important agroforestry tree species in Punjab and is grown mainly for commercially important industrial timber. Timber volume (both over bark and under bark), fresh timber weight, above ground biomass, and firewood estimate tables have been developed based on regression equations. Of four simple regression models tested for single-entry and multi-entry regression equations, linear and multiplicative models of the form Y = a + b^x and Y = a^*x ^", respectively, provided the best fit to the observed limits of data. Applicability of multi-entry tables was checked through statistical analyses and were found to be applicable without correction. Percentage of bark volume (over bark and under bark timber volume) for clone G-3 was found to be 18.5 and 22.6 per cent, respectively. Tbe specific gravity of green wood came out to be 0.806.

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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.

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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.

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G. S. Rattan , R. S. Dhanda , H. S. Randhawa

Abstract

C. clavatum is reported as the cause of ischolar_main disease of E. hybrid. In the inoculated soil the seedling started willing after 5-6 days of transplantation and all the seedlings were killed within three weekss of transplation. Symptoms on the incoulated seedlings are described. The cultural character of the fungus on PDA, rapeseed agar, malt extract agar and Czapeks (dox) agar are given. Growth of the fungus was maximum on rapeseed agar and Czapeks (dox) agar and minimum on malt extract agar. The pathogen was also found associated with seed of E. hybrid, Eleven fungicides were evaluated by food poison technique. All the treatments were better than control. Aggalot was the most effective followed be Thiram and Vitavax, while Cuman-L was the least effective.

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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

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