N. Gurunathan , P. Srimathi , M. Paramathma , K. T. Parthiban , K. Kumaran

Abstract

Studies made with Jatropha curcas on seed priming with different growth regulators, temperatures and durations with the constant seed to solution ratio of 3:2 revealed that priming with IBA 200 ppm at ambient temperature for a duration of 12 to 24 h enhanced the quality characters of Jatropha seedling raised at nursery to evaluate its performance in production of quality seedlings.

Keywords

Jatropha curcas, Quality Seedlings, Seed Priming, Growth Regulators

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K. Kumaran , I. Jaisankar , K. Nesamani , M. Paramathma

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No abstract

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K. Kumaran , S. Umesh Kanna , K. Geethanjali , M. Paramathma

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G. Kumaravelu , S. R. Sree Rangasamy , M. Paramathma

Abstract

During 1984-85, through comparison tree method 199 female plus trees 52 male plus trees were identified. Of these, 79 female and 20 male plus trees alone had adequate number of ischolar_mained sprigs for planting. Thus ultimately ramets of these plus trees were planted in a double ring isolation computerized design at NeyveIi. Seeds from 25 female plus trees each crossed with 3 male plus trees thus forming 75 progenies were raised in the nursery, evaluation was carried out both at 6 months after sowing (juvenile) and 36 months after planting (adult) in the field at two sites viz., Coimbatore and Mettupalayam. The four juvenile characters viz., seedling height, collar diameter ischolar_main length and nodule number (6MAS) were each correlated with nine adult (36MAP) characters viz., height, basal, diameter, dbh, suitability index, needle weight, branch weight, bark thickness, pole weight and total biomass at Coimbatore and eight adult characters were included with the exception of basal diameter at Mettupalayam. This correlation revealed collar diameter to reflect more reliably the adult performance.

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K. T. Parthiban , M. Paramathma , R. Jude Sudhagar , K. S. Neelakantan

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No abstract

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K. T. Parthiban , M. Paramathma , R. Jude Sudhagar

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No abstract

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M. Antony Joseph Raj , M. Paramathma , G. Kumaravelu

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Thirty four candidate plus clumps of Bumbusa bambos were selected from 17 locations of Tamil Nadu and assembled in the mother nursery at Forest College and Research Institute, Mettupalayam. Studies were undertaken during 1997-1999 in the mother nursery at six months after planting to elicit information on the correlation and path coefficients of Babusa bambos. The characters leading shoot length, average shoot length, number of internodes per shoot, average internodal length, average culm diameter, leaf length and leaf width were found to be poitively correlated with number of culms. Path coefficient analysis revealed that the average internodal length, leading shoot length, average shoot length, leading shoot diameter, average culm diameter have both direct and indirect effect on number of culms at six months after planting.

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P. Masilamani , M. Paramathma , C. Chinnusamy , R. Jude Sudhagar , K. Annadurai

Abstract

Field experiments were carried out to evaluate two different pre-emergence herbicides on weed control efficiency, germination and seedling growth of pungam (Pongamia pinnata) nursery. Three days after sowing, pre-emergence herbicides viz. atrazine (50% WP) and fluchloralin (45% EC) were applied at different concentrations on the nursery bags using rose cane. Thirty days after application of herbicides, observations were made on germination percentage and 50 days after application of herbicides, number of predominant weeds (broad leaved, grasses and sedges), weed dry weight(g), weed control efficiency and ischolar_main length (cm), shoot length (cm) and dry matter production (g seedling^-5) of pungam seedling in each treatment were recorded. The results revealed that the compatibility of application of pre-emergence herbicide of atrazine at 0.10% - 0.20% can be used effectively to control broad leaved weeds, without impairing the germination and seedling growth of Pongamia pinnata.

Keywords

Pongamia pinnata, Pre Emergence Herbicides, Germination, Seedling Vigour

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