scholarly journals Vegetative Propagation Trial of Prosopis africana (Guill. et Perr.) Taub. by Air Layering under Sudano-Sahelian Climate in the South-Central Niger

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Laouali Abdou ◽  
Saley Karim ◽  
Rabiou Habou ◽  
Ali Mahamane
Keyword(s):  
Vegetative Propagation ◽  
Germination Rate ◽  
The South ◽  
Diameter Class ◽  
South Central ◽  
Significant Difference ◽  
Wood Debris ◽  
Prosopis Africana ◽  
Black Plastic ◽  
Diameter Classes

Prosopis africana is a species of great socioeconomic importance but threatened with extinction in Niger because of overuse and regeneration problem. This study, conducted in the Maradi (Niger) area, precisely at El Gueza in the south of Gazaoua department, aims to evaluate the vegetative propagation capacity of P. africana by air layering under the Sudano-Sahelian climate of the south-central Niger. A ring of bark was taken on each selected branch and the wound was covered with a black plastic filled with a damp mixture of soil and wood debris. The chosen parameters are the diameter class and the position on the branch. In all, 60 branches were treated and followed for 130 days: 28.33% produced shoots and there was no significant difference between the diameter classes and between the positions. These results show that propagating trees of the species by air layering is possible and this technique can be used to multiply and keep this species, which will reduce the regeneration problem linked to a low seed germination rate.

scholarly journals Vegetative Propagation of Balanites aegyptiaca (L.) Del. by Air Layering under Sahelian Climate in Niger

2019 ◽  
pp. 1-10
Author(s):  
Maman Kamal Abdou Habou ◽  
Habou Rabiou ◽  
Laouali Abdou ◽  
Boubacar Moussa Mamoudou ◽  
Ismaël Bio Yandou` ◽  
...  
Keyword(s):  
Survival Rate ◽  
Vegetative Propagation ◽  
Diameter Class ◽  
Balanites Aegyptiaca ◽  
Fruit Species ◽  
Average Survival ◽  
Significant Difference ◽  
Class 1 ◽  
Average Survival Rate ◽  
Diameter Classes

Balanites aegyptiaca (L.) Del. is a fruit species from the Sahelian and Sudano-sahelian zones, highly appreciated by the population. It provides a source of income for the rural population and its various parts are used for human and animal food, handicrafts and traditional medicine. However, the lack of data on propagation techniques of the species is a significant limitation to its domestication. This study aims to evaluate the vegetative propagation capacity of Balanites aegyptiaca by air layering. The trials were conducted in the Arboretum of Sahara Sahel Foods in Zinder, Niger. The layers were placed on orthotropic branches. The variables selected were the diameter class (1-2 cm, 2-3 cm and 3-4 cm) and the substrates (sand+manure, sand+sawdust and sand). A total of 116 layers were made. The results show that 93.1% of the layers have taken root two months after realization. The diameter classes and the three substrates have no significant influence on the number of roots. In contrast, root length varied significantly with substrates (P = 0.000) and branch diameter classes (P = 0.031). As for the diameter of the newly formed roots, a significant difference was observed between the diameter classes and the substrates have no significant effect on this parameter. One month after weaning of layers, an average survival rate of 68.5% was obtained. The seedlings of the diameter class 2-3 cm have the highest survival rate (83.1%). These results suggest that it is possible to produce Balanites aegyptiaca plants by air layering, and could contribute to the development of strategies adapted to its domestication.

scholarly journals Stacked volume conversion factor for geometric volume of Eucalyptus sp.

2019 ◽  
Vol 13 ◽  
pp. 46
Author(s):  
André Salgado De Andrade Sandim ◽  
Ariadna Coelho Mota ◽  
Mario Lima Dos Santos ◽  
Welton Dos Santos Barros ◽  
Beatriz Cordeiro Costa ◽  
...  
Keyword(s):  
Conversion Factor ◽  
Diameter Class ◽  
Wood Volume ◽  
Conversion Factors ◽  
Mean Values ◽  
Significant Difference ◽  
Clonal Plantation ◽  
Real Value ◽  
Different Diameters ◽  
Diameter Classes

Post-harvest, wood volume can be calculated with a stacking factor which can be influenced by diameter classes involved. Consequently, the following question arises: there is a difference between the volume conversion factor for stacked to geometric volume between piles of clonal plantation logs of different diameters classes? The hypothesis is: if smaller logs have a higher stacked to geometric volume conversion factor, between-log voids will be smaller and the overall stacks will therefore have lower volumes. Therefore, the objective of this study was to compare stacking and cubing factors in stacks of logs with different diameters for two Eucalyptus sp. clones. The study was conducted in Barra do Corda municipality, Maranhão State, Brazil. Timber was laid in piles of logs by diameter class, composed of logs of smaller (9-10.99 cm) and larger (11-13 cm) diameters. Stacking factor means for clone 1 were 1.88 for the larger diameter and 2.00 for the smaller diameter class, while for clone 2 mean values were 1.62 and 1.65, for stacks with larger and smaller diameter classes, respectively. For logs from the same clone there was no significant difference for the conversion factors between the stacks with the largest and smallest diameter. However, there was a significant difference in the conversion factors between the two clones, proving the hypothesis tested. Thus, for each genetic lineage, a proper stacking factor must be established so that the estimated volume comes close to the real value.

scholarly journals Biomass Allocation and Carbon Stock in Elm (Ulmus Wallichiana Planch) Plantation

2017 ◽  
Vol 12 (2) ◽  
pp. 339-344
Author(s):  
Shabir Rather ◽  
K.N. Qaisar ◽  
Sabeena Nabi ◽  
R. Banyal ◽  
P.A. Khan ◽  
...  
Keyword(s):  
Biomass Allocation ◽  
Carbon Stock ◽  
Growth Parameters ◽  
Stem Volume ◽  
Maximum Height ◽  
Total Biomass ◽  
Diameter Class ◽  
Increase With Increase ◽  
Significant Difference ◽  
Diameter Classes

The present investigation was conducted on a 22- year old Elm plantation established at Wadura campus of SKUAST-Kashmir. Four diameter classes viz., D1 (5-10cm), D2 (10-15cm), D3 (15-20cm) and D4 (>20cm) were stratified from the plantation and 24 trees (6 from each diameter class) were randomly selected and felled in the year 2015. The growth parameters of the trees increased with increase in the diameter class. The maximum height, dbh, basal area and stem volume were 14.98m, 23.77cm, 0.044m2 and 0.400m3, respectively. Biomass per tree of all tree components viz., stem, branches, foliage and roots showed significant increase with increase in the diameter of the trees. The total biomass, carbon stock and carbon dioxide equivalent increased from lower to higher diameter classes. The highest values observed for these parameters were 475.54 kg/tree (fresh), 148.59 kg/tree and 543.82 kg/tree, respectively under D4 diameter class. The biomass allocation coefficient of branch and root (BACb and BACr) attained higher values in lower diameter classes. The maximum and minimum values of these coefficients were 0.158 and 0.085; 0.298 and 0.278, respectively under D1 and D4 diameter classes. The size of trees did not produce significant effect on the biomass allocation coefficient of foliage (BACf). The diameter of the trees produced non-significant difference in the growth efficiency (GE) of different tree components.

scholarly journals EFFECT OF STEM DIAMETER, MEDIA TYPE AND LIGHT INTENSITY ON THE GROWTH OF MEDICINAL PLANT OF SCREW TREE/KAYU ULES (Helicteres isora Linn.)

2021 ◽  
Vol 8 (2) ◽  
pp. 213-227
Author(s):  
Dani Pamungkas ◽  
Aziz Umroni ◽  
Nurhuda Adi Prasetyo
Keyword(s):  
Survival Rate ◽  
Light Intensity ◽  
Leaf Area ◽  
Vegetative Propagation ◽  
Stem Cutting ◽  
Diameter Class ◽  
Media Type ◽  
Helicteres Isora ◽  
Media Types ◽  
Diameter Classes

Screw tree (Helicteres isora) is a shrub species (Fam: Malvaceae) with 1.5–4 m in height and  with multi-main trunks up to 9–12. In Indonesia, kayu ules has been used as a traditional medicine, known as jamu, and has been commercialized. In order to cultivate this species, vegetative propagation is likely promising compared to the generative propagation since seed viability is low and cannot be stored for longterm. Nevertheless, there is a lack of information on which diameter classes, media types and light intensities would give the best result for vegetative propagation. This research aimed to obtain information on which diameter classes and media that were suitable for kayu ules stem cutting propagation and to what degree the light intensity would be best for the growth of the seedlings of kayu ules. Three diameter classes and four media types were employed in a  complete random design under the greenhouse environment.   Three months old good quality vegetatively-propagated seedlings were transplanted under two light intensities (under transparent canopy and shading net). The result showed that  considering the factor of diameter classes and media in kayu ules stem cutting propagation, it had improved the survival of the stem cutting. Diameter class I was best grown in media type 3 with 46.67 ± 12.2 % of survival rate, diameter class II was best grown in media type 2 with 38.67 ± 11.6 % of survival rate, whereas diameter class III was best grown in media type 4 with 52 ± 6.9 % of survival rate. The transplanted seedlings also grew significantly better under transparent canopy with higher light intensity. The distinctive features of screw tree under shading net were wider leaf area, higher specific leaf area and relative water content but it was lower in above ground dry biomass compared to the kayu ules under transparent canopy.

scholarly journals Investigating the out-of-roundness and pith-off-centre in stems of three broadleaved species in Hyrcanian forests

2012 ◽  
Vol 58 (No. 11) ◽  
pp. 513-518 ◽  
Author(s):  
A. Fallah ◽  
N. Riahifar ◽  
K. Barari ◽  
A. Parsakhoo
Keyword(s):  
Stem Diameter ◽  
Diameter Class ◽  
Hyrcanian Forests ◽  
Breast Height ◽  
Significant Difference ◽  
Alnus Subcordata ◽  
Pith Eccentricity ◽  
Diameter Classes

The out-of-roundness and pith-off-centre of Alnus subcordata, Acer velutinum and Quercus castaneifolia growing in Hyrcanian forests of Iran were investigated. Stem disks were cut from the breast height and stump height of felled trees in diameter classes of 20 cm to 90 cm. Results indicated that the pith eccentricity for Acer velutinum was significantly greater than that of Alnus subcordata and Quercus castaneifolia (P < 0.01). The pith-off-centre significantly increased with increasing stem diameter from 20 cm to 50 cm, while no significant difference were observed for pith-off-centre index from diameter class of 55 cm to 90 cm. The out-of-roundness in stems of Acer velutinum and Alnus subcordata was significantly greater than that of Quercus castaneifolia (P < 0.01). Moreover, out-of-roundness significantly decreased with increasing stem diameters from 20 cm to 45 cm except for 35 cm. There were no significant differences among diameter classes from 60 cm to 85 cm with respect to out-of-roundness. For all the species, the out-of-roundness and pith-off-centre at stump height were greater than those at breast height.

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