Growth and nutrients variation between<i>Grevillea robusta</i>provenances in Tanzania

Maliondo, S. M. S.; Mbaga, P. D.; Sabas, E.; Pederson, Arne Gloria; Madoffe, S. S.

doi:10.1080/10295925.1998.9631203

Cited by 3 publications

(2 citation statements)

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“…In addition, Yakob et al (2017) reported that G. robusta showed 80 cm height growth in deep dark reddish clay soil and Yeshiwas et al (2018) reported that farm yard manures and nitrogen fertilizers played an important role on plant growth and development in sandy soil. Growth of height and root collar diameter of G. robusta without treatment was affected by shortage of soil nutrients such as phosphorous, potassium, and nitrogen as well due to toxicity of Copper and Zinc, for successive twelve months (Maliondo et al, 1999). The average DBH and height of the trees showed significant difference under different spacing regimes (Sanjith et al, 2020).…”

Section: G Robustamentioning

confidence: 98%

The impacts of post plantation management practices on growth and survival rate of selected tree species in Mirab Abaya District, Southern Ethiopia: An experimental approach

Tizazu¹,

Bhaskarrao²,

Memhiru³

et al. 2022

J. Hortic. For.

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The impacts of post-plantation management practices (urea, farm yard manure, and combinations of urea and farmyard manure) on the growth and survival rates of selected indigenous and exotic tree species Cordia africana, Olea europaea, Grevillea robusta, and Cupressus lusitanica at Sutte microwatershed, Morode kebele in Mirab Abaya district, South Ethiopia were investigated. Soil samples were collected from the experimental site by the zigzag method at 10 m intervals from a 40 m by 80 m plot of land and analysed in Arba Minch University for their physical and chemical properties. Results showed that the mean soil texture was 94.12% sand, 4.66% silt and 1.19% clay, pH (6.95), and total nitrogen and available phosphorous were low, with corresponding results of 0.04% and 2.1 mg/L, respectively. Similarly, soil organic matter, available potassium and cation exchange capacity (CEC) were 2.8%, 1.33 mg/L and 13.2 mg/L, respectively. On the other hand, micronutrients like copper and zinc were 1.18 and 3.2 mg/L, respectively. The concentration of iron was 1.95 mg/L which no longer hampered the growth of planted tree seedlings. The growth of height and root collar diameter (RCD) of planted tree seedlings was measured, and the survival rate was calculated for each tree species for twelve months. Tree seedlings that received the combination of urea and farmyard manure (FYM) showed the longest height, RCD and the highest survival rate in C. lusitanica compared to other three planted seedlings species. The lowest growth in height and survival rate was recorded in O. europaea. The major limiting factors of the study included experimental site due to the presence of sandy soil and the toxicity of copper and zinc. However, these limitations were avoided by testing the soil before planting tree seedlings on selected sites and preparing plantation pits during dry seasons 2 to 3 months before the plantation period.

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Section: G Robustamentioning

confidence: 98%

The impacts of post plantation management practices on growth and survival rate of selected tree species in Mirab Abaya District, Southern Ethiopia: An experimental approach

Tizazu¹,

Bhaskarrao²,

Memhiru³

et al. 2022

J. Hortic. For.

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“…In Tanzania, Maliondo et al (1998) tested the growth of seven Australian provenances of grevillea and two Tanzanian landraces (named "Soni" and "Rombo") at two sites, Kiroka and Mkundi. These sites were 70 km apart and varied for climate, soil and altitude.…”

Section: Genetic Variationmentioning

confidence: 99%

Cost benefit analysis for Grevillea robusta in Ethiopia: linking establishment of a breeding seedling orchard to the economic returns of quality plantings

Pedercini¹,

I.K.²

2022

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References AppendicesAppendix I Appendix II iv List of Tables in main text1. Summary of trials and genetic variability studies on grevillea. Entries are organised alphabetically by first author of the study and then date of publication 2. Sites IDs assigned to three quality scenarios for assessed grevillea planting 3. Assumptions used for different planting options when estimating contribution margins 4. Summary of costs over a single cycle of production for grevillea planting options and quality scenarios 5. Summary of NPV, IRR and EAC values over a single cycle of production for grevillea planting options and quality scenarios 6. Summary of mean annual increments over a single cycle of production for grevillea planting options and quality scenarios List of Figures1. A Grevillea robusta plantation in Masinagudi, India (Creative Commons Attribution-Share Alike 4.0 International license, "Masinagudi Habitat -Silver Oak Grevillea robusta Plantation" by P. Jeganathan) 2. Modelled predicted growth of grevillea for unique IDs (sites, coloured lines) and for the general data pool (black line). Figures A and B show predictions for tree height and DBH, respectively 3. Growth curves of height (A) and DBH (B) fitted to data segregated by three quality scenarios (AY = actual yield, CYG = closing yield gap, PY = potential yield), with derived profiles of aboveground biomass (C, AGB) and under-bark volume (D, V u ) 4. A tree-map where BSO establishment costs are represented. Different squares areproportional in area to specific costs 5. Cumulative NPV (Birr ha-1) for grevillea for the planting options of agroforestry and woodlots and three quality scenarios. Note the difference in x-axis scaling between quality scenarios, reflecting the different lengths of a single production cycle (long, intermediate and short for AY, CYG and PY, respectively) 6. The difference in cumulative NPV nationally between each of the CYG and PY quality scenarios and the business-as-usual AY scenario, based on the establishment of a grevillea BSO in year 1. The vertical lines indicate when the cumulative NPV shifts from negative to positive for both comparisons. The grey profile corresponds to an average level of tree improvement between CYG and PY scenarios 7. Mean Annual Increment for AGB (t ha -1 y -1 ) and V u (m 3 ha -1 y -1 ) over time for grevillea production for agroforestry and woodlot planting options and three quality scenarios. The y-axis reflects one production cycle which varies in length for the quality scenario v

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Spatial Population Structuring and Genetic Analysis of Exotic Grevillea robusta in Northwestern India

Dabral,

Meena,

Shankhwar

et al. 2024

Forest Science

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The introduction of exotics is common in forestry, and majorly important species, like eucalypts, poplar, and Casuarina sp., occupy vast areas in the Indian subcontinent. Importantly, with the latest cost-effective sequencing techniques, genetic diversity research through molecular marker approaches on major exotics provides novel information for genetic improvement in economic traits with climatic adaptation. The study was carried out on Grevillea robusta to assess genetic relatedness and diversity among 228 genotypes belonging to five northwestern states in India. These genotypes were assayed using twelve simple sequence repeat (SSR) markers. A population structure analysis using structure software identified four major gene pool subgroups with clear-cut differences from each other. Principal coordinate analysis also supports the clustering patterns of the unweighted pair group method with arithmetic mean analysis. In the case of genetic diversity assessment, a total of seventy-three alleles were detected from twelve SSRs, with an average of 6.08 ± 0.71 per locus. Polymorphism information content ranged from 0.17 to 0.67 with a mean of 0.44 ± 0.045, indicating high levels of polymorphism across the genotypes. All the evaluated SSRs demonstrated moderate genetic diversity (observed heterozygosity = 0.31 ± 0.03; expected heterozygosity = 0.32 ± 0.03; and genetic differentiation = 0.295) among the sampled genotypes. These findings indicate significant genetic variability in the germplasm to warrant selection and have potential for a long-term tree improvement program of G. robusta in India. Study Implications: The study on population genetics of Grevillea robusta in exotic environments assessed probable gene pools, provenances, and genetic diversity in geographical distribution range of the species in the Indian scenario. The basic population genetic measures revealed the high diversity areas and probable seed zones of G. robusta in its exotic range. Importantly, the study will be helpful in the selection of candidate plus trees of G. robusta to further strengthen the genotype × environment interaction study for future breeding programs. Further, studying the genetic makeup for moderately diverse species offers valuable insights into evolutionary history, population dynamics, and ecological interactions, which may lead to conservation efforts and guidance for the management of trees such as G. robusta in their native and introduced regions.

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Growth and nutrients variation betweenGrevillea robustaprovenances in Tanzania

Cited by 3 publications

References 3 publications

The impacts of post plantation management practices on growth and survival rate of selected tree species in Mirab Abaya District, Southern Ethiopia: An experimental approach

The impacts of post plantation management practices on growth and survival rate of selected tree species in Mirab Abaya District, Southern Ethiopia: An experimental approach

Cost benefit analysis for Grevillea robusta in Ethiopia: linking establishment of a breeding seedling orchard to the economic returns of quality plantings

Spatial Population Structuring and Genetic Analysis of Exotic Grevillea robusta in Northwestern India

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