scholarly journals Respuesta del ñame espino a diferentes densidades de siembra y altura de espalderas

2021 ◽  
Vol 23 (4) ◽  
pp. 210-219
Author(s):  
Ricardo Enrique Tamara Morelos ◽  
◽  
Lily Lorena Luna Castellanos ◽  
Amaury Aroldo Espitia Montes ◽  
Rafael Segundo Novoa Yanez ◽  
...  
Keyword(s):  
Experimental Design ◽  
Sustainable Management ◽  
Management Practices ◽  
Plant Density ◽  
Food Sources ◽  
Planting Density ◽  
Caribbean Region ◽  
Main Plot ◽  
The Caribbean ◽  
Stand Height

The tubers of spiny yam are one of the main food sources for producers in the Caribbean region of Colombia. However, the productivity of the crop is low due to the scarce use of sustainable management practices that contribute to its improvement. In this sense, a study was conducted at the Turipaná Research Center of Agrosavia, El Carmen de Bolívar, with the objective of evaluating the response in yield of purple stalk hawthorn yam cv. purple stalk to different planting densities and trellis heights. Six treatments were evaluated in a randomized complete block experimental design with a split plot arrangement, the main plot corresponded to two densities (14,285 plants ha-1 and 20,000 plants ha-1) and the subplots to three trellis heights (1.6 m; 2.0 m and 2.4 m). Planting density was the only factor that significantly influenced yield; the use of 20,000 plants ha-1 increased yield by 28.68% compared to the lowest density. The use of supports with heights of 2.4 m in combination with either of the two planting densities induced the production of tubers unsuitable for commercialization. The findings of this research suggest that increasing plant density could be a safe measure to increase yields and economic efficiency in the cultivation of hawthorn yam. Future evaluations are needed on stand height and number of plants to tie per stand.

Wider Caribbean Region—A Pivotal Time to Strengthen Regional Instruments For Biodiversity Conservation

2008 ◽  
Vol 23 (3) ◽  
pp. 499-530 ◽  
Author(s):  
Barbara Lausche
Keyword(s):  
Biodiversity Conservation ◽  
Sustainable Management ◽  
Marine Ecosystem ◽  
Legal Framework ◽  
Caribbean Region ◽  
International Policy ◽  
Global Environment Facility ◽  
Large Marine Ecosystem ◽  
The Caribbean ◽  
Specially Protected Areas

AbstractThe countries of the Wider Caribbean Region (WCR) are linked economically by their transboundary living marine resources. The region is facing a continued decline of these resources. Science is improving our understanding of the human contributions to this decline, but national policies and programmes have not kept pace with this understanding. The Caribbean Regional Seas Programme and its Cartagena Convention and Protocols provide the regional legal framework for protection and sustainable management of the WCR's living marine and coastal resources. This article focuses on the Cartagena Convention's Protocol for biodiversity conservation, the Protocol Concerning Specially Protected Areas and Wildlife (SPAW), arguing that governments and organizations need to significantly increase participation in this regional treaty regime to effectively address transboundary environmental challenges. A new initiative, the Global Environment Facility-supported Caribbean Large Marine Ecosystem project, will help in this effort. International policy supports strengthened regional seas programmes. It is now imperative for all levels and sectors to assist governments in strengthening this important treaty regime for biodiversity conservation in the Wider Caribbean Region.

scholarly journals EFFECTS OF N FERTILITY, PLANT DENSITY AND CULTIVAR ON YIELD OF DILL

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1165f-1165
Author(s):  
Owusu Bandele ◽  
Xenia Wolff ◽  
Byron Belvitt ◽  
Justin Egbe
Keyword(s):  
Plant Density ◽  
Long Island ◽  
Block Design ◽  
Fertilizer Application ◽  
N Fertilizer ◽  
Planting Density ◽  
Fresh Weight ◽  
Main Plot ◽  
N Fertility ◽  
N Fertilizer Rate

Two experiments were conducted in 1988 and 1990 to determine the effects of planting density, N fertilizer rate, and cultivar on fresh yield of dill. A split plot design was used in the first experiment in which planting density (one versus two rows per bed) was the main plot treatment and N rate (0, 56, 112 kg/ha) was the subplot treatment. A European cultivar, `Crown,' was used in the first experiment in 1988 while `Long Island Mammoth' was planted in 1990, N was applied in split applications while both K2 O and P2 O5 were preplant incorporated at the rate of 134 kg/ha. Planting was done on bedded rows approximately 66 cm wide and 15 cm high. N fertilizer application did not affect yield in 1988. Leaf, stem, flower, and total yields were greater for the high density planting. The second experiment evaluated yield of four cultivars (`Tetra,' `Bouquet.' `Long Island Mammoth,' and `Crown') using a randomized complete block design. `Long Island Mammoth' and `Tetra' produced greater leaf and total fresh weight while `Long Island Mammoth' and `Bouquet' produced greater flower fresh weight.

scholarly journals Effect of population density on growth and production of hybrid maize

2021 ◽  
Vol 911 (1) ◽  
pp. 012046
Author(s):  
Suwardi ◽  
Syafruddin ◽  
Muhammad Aqil ◽  
Roy Efendi ◽  
Z. Bunyamin
Keyword(s):  
Plant Density ◽  
Maize Yield ◽  
Planting Density ◽  
Maize Production ◽  
High Productivity ◽  
Yield Increase ◽  
South Sulawesi ◽  
Maize Type ◽  
Main Plot ◽  
Hybrid Maize

Abstract One of the strategies to increase maize production is by selecting the proper combination among variety and planting density. The plant density population experiment was carried out to identify the candidate of maize variety that has high productivity with limited sunlight levels. Our hypothesis was how the erect leaf maize type can get optimal sunlight and affect the productivity. The study was conducted in IP2TP Bajeng, Gowa, South Sulawesi from March to June 2020. This study was designed under split plot design where spacing or plant density as the main plot with 3 levels of treatment (70 cm x 20 cm (population 71,428 plants/ha), 60 cm x 20 cm (population 83,333 plants/ha) and 50 cm x 20 cm (population 100,000 plants/ha). Furthermore, eight genotypes of hybrid maize (ERC 01, ERC 02, ERC 03, ERC 04, ERC 05, ERC 06, ERC 07, ERC 08), including control varieties (JH 45 and Pioneer 36) were treated as the sub-plots. The results indicated that the maize yield increase in line with the increase in plant population. The plant’s spacing of 70 x 20 cm with 100,000 plants/ha was produced 10.61 t/ha, significantly higher than other treatments.

scholarly journals Chives production according to planting density

2020 ◽  
Vol 9 (9) ◽  
pp. e108997085
Author(s):  
Bruno Novaes Menezes Martins ◽  
Jean Lucas Mendes Castro ◽  
Joara Secchi Candian ◽  
Leticia Galhardo Jorge ◽  
Antonio Ismael Inácio Cardoso
Keyword(s):  
Experimental Design ◽  
Plant Height ◽  
Plant Density ◽  
Block Design ◽  
Leaf Number ◽  
Planting Density ◽  
Higher Plant ◽  
Randomized Block Design ◽  
Shoot Weight ◽  
The Ideal

In the search for optimization of production, the use of the ideal plant density is of fundamental importance. So, the objective of this research was to evaluate the effect of planting densities on chive production, varying the spacing between holes and the number of plants per hole. The experimental design was a randomized block design, with twelve treatments in the 4 x 3 factorial scheme, with four spacings between holes (0.05, 0.08, 0.11 and 0.14 m) and three numbers of plants per hole (2, 3 and 4 plants per hole), with four replicates. Leaf number, plant height, leaf diameter, fresh and dry shoot weight (g plant-1) and yield (t ha-1) were evaluated. It was observed that with a greater number of plants per hole, there is reduction in the production per plant, however, the yield is higher. The smaller the spacing, the greater the yield of chives. So it is possible to recommend the higher plant density for chive production, and the use of three or four plants per hole.

Response of improved robusta coffee to location and management practices in Ghana

1997 ◽  
Vol 33 (01) ◽  
pp. 103-111 ◽  
Author(s):  
F. M. Amoah ◽  
K. Osei-Bonsu ◽  
F. K. Oppong
Keyword(s):  
Experimental Design ◽  
Management Practices ◽  
Growth And Yield ◽  
Soil Conditions ◽  
Plant Populations ◽  
Ecological Zones ◽  
Robusta Coffee ◽  
Main Plot ◽  
Four Levels ◽  
Suitable Area

Studies were carried out at three locations in Ghana to investigate the effects of Glyricidia maculata shade intensity and of the spacing of coffee on the growth and yield of improved robusta coffee. The three locations selected fall within ecological zones which could be described as suitable, moderately and marginally suitable in terms of rainfall availability and soil conditions.The experimental design was a split plot with shade as the main plot and coffee spacing as the sub-plot. The four levels of shade were: no shade, and Glyricidia maculata at densities of 70, 90 and 185 per ha corresponding to sparse, moderate and heavy shade conditions. The coffee spacings were 3 m×2 m, 3 m×2.2 m, 3.5 m×2 m and 3.5 m×2.5 m giving plant populations of 1670, 1520, 1430 and 1140 per hectare, respectively.There were no effects of shade or spacing on coffee seedling growth at all locations during establishment. Sparse shade gave higher yields in the suitable areas. Moderate shade was required for the moderately and marginally suitable areas. In general, closely spaced coffee gave higher yields than the widely spaced coffee at the suitable and moderately suitable areas whilst there was virtually no response to coffee spacing in the marginally suitable area. There were no interaction effects of shade and spacing on coffee growth or yield. Biennial alternation of coffee-bearing associated with seedling materials was observed in this study.

African Caribbean Residents of Edinburgh in the Eighteenth and Nineteenth Centuries

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Lisa Williams
Keyword(s):  
Nineteenth Century ◽  
British Empire ◽  
Caribbean Region ◽  
African Caribbean ◽  
The Caribbean ◽  
Eighteenth And Nineteenth Centuries

Scotland is gradually coming to terms with its involvement in slavery and colonialism as part of the British Empire. This article places the spotlight on the lives of African Caribbean people who were residents of Edinburgh during the eighteenth and nineteenth centuries. I discuss their varied experiences and contributions: from runaways and men fighting for their freedom in the Scottish courts to women working as servants in city households or marrying into Edinburgh high society. The nineteenth century saw activism among political radicals from abolitionists to anticolonialists; some of these figures studied and taught at Edinburgh University. Their stories reflect the Scottish capital’s many direct connections with the Caribbean region.

Undiscovered phosphate resources in the Caribbean region and their potential value for agricultural development

Circular ◽  
1985 ◽  
Author(s):  
Richard Porter Sheldon ◽  
D.F. Davidson ◽  
S.R. Riggs ◽  
W.C. Burnett
Keyword(s):  
Agricultural Development ◽  
Caribbean Region ◽  
Potential Value ◽  
The Caribbean

Sustainable Management of Soil for Carbon Sequestration

2017 ◽  
Vol 5 (2) ◽  
pp. 132-140 ◽  
Author(s):  
Kewat Sanjay Kumar ◽  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Sustainable Management ◽  
Management Practices ◽  
Atmospheric Co2 ◽  
Carbon Pools ◽  
Carbon Stabilization ◽  
Organic C ◽  
Soil Ecosystems ◽  
C Stocks

Mechanisms governing carbon stabilization in soils have received a great deal of attention in recent years due to their relevance in the global carbon cycle. Two thirds of the global terrestrial organic C stocks in ecosystems are stored in below ground components as terrestrial carbon pools in soils. Furthermore, mean residence time of soil organic carbon pools have slowest turnover rates in terrestrial ecosystems and thus there is vast potential to sequester atmospheric CO2 in soil ecosystems. Depending upon soil management practices it can be served as source or sink for atmospheric CO2. Sustainable management systems and practices such as conservation agriculture, agroforestry and application of biochar are emerging and promising tools for soil carbon sequestration. Increasing soil carbon storage in a system simultaneously improves the soil health by increase in infiltration rate, soil biota and fertility, nutrient cycling and decrease in soil erosion process, soil compaction and C emissions. Henceforth, it is vital to scientifically explore the mechanisms governing C flux in soils which is poorly understood in different ecosystems under anthropogenic interventions making soil as a potential sink for atmospheric CO2 to mitigate climate change. Henceforth, present paper aims to review basic mechanism governing carbon stabilization in soils and new practices and technological developments in agricultural and forest sciences for C sequestration in terrestrial soil ecosystems.

Sign in / Sign up

Export Citation Format

Share Document