Baljit Singh , R. I. S. Gill , Navneet Kaur

Abstract

Light textured soils having low organic matter and nutrient content in the soil are prone to nutrient deficiencies in the plants growing on such soils. Zinc deficiency symptoms were observed in poplar plantations and nurseries, having soil deficient in organic matter and nutrient contents in Ludhiana District of Punjab on such soils. The deficiency was exhibited by development of irregular interveinal chlorosis of recently matured leaves along the margins that extends towards base of leaves. The deficiency was ameliorated by soil application of 25 g/plant Zn (through ZnSO₄.7H₂O) in 1 year old plants, 40 g/plant Zn in 2 years old plants and 30 kg/ha Zn in 4.5 years old plants. Application of 20 kg/ha Zn was sufficient for eradicating Zn deficiency in nurseries. Deficiency could be cured by 5-6 weekly sprays of 0.5 per cent ZnSO⁴.7H²O (alongwith half the quantity of unslaked lime) in the solution volumes of 1 l/tree for one year old trees, 2 l/tree for 2 year old trees and 250 l/ha for nursery. The micronutrient (except Fe) content of the recently matured normal leaves (Zn: 29.2-38.6 mg kg^-1) was higher than the deficient leaves (Zn: 25.2-28.4 mg kg^-1) taken from same position on branch or stem of trees. It was suggested to apply Zn at the planting time of poplar that can meet the requirement of plants throughout its growth.

Keywords

Zinc Deficiency Symptoms, Poplar Nursery And Plantation, Punjab, Corrective
Measures, Nutrient Concentration, Soil Application

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R. I. S. Gill , S. S. Gill

Abstract

The problem of exudation of phenolic compounds from the exposed cuts ends of Eucalyptus was less severe in the explant taken from the basal and middle portion of the branch. Further the use of PVP, caffeine and activated charcoal in the culture media as well as in the form of solution Was not helpful in solving the problem of phenols. The best results were obtained when the explants were frequently subcultured after every 3-4 days on the same medium used for the proliferation of shoots.

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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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