scholarly journals Caracterización Eco-geográfica de melloco (Ullucus tuberosus C.) En la Región Alto Andina del Ecuador

2018 ◽  
pp. 31
Author(s):  
Edwin Jesús Naranjo Quinaluisa ◽  
César Guillermo Tapia Bastidas ◽  
Roberto Javier Velázquez Feria ◽  
Yudemir Cruz Pérez ◽  
Angélica Hipatia Delgado Pilla ◽  
...  
Keyword(s):  
Sandy Loam ◽  
Andean Region ◽  
Geographic Ranges ◽  
Palabras Clave ◽  
Ullucus Tuberosus ◽  
Temperature Ranges ◽  
Loam Soil ◽  
Resources Conservation ◽  
Edaphic Variables

Ecogeographic characterization of Melloco (Ullucus tuberosus C.) in the high Andean region of Ecuador Resumen El estudio se llevó a cabo en la región alto Andina del Ecuador, utilizando la colección nacional de Melloco (Ullucus tuberosus C.), perteneciente al Banco Nacional de Germoplasma del INIAP. El objetivo fue evaluar las características de los sitios de colecta, identificar rangos climáticos y ecosistemas favorables o marginales para el cultivo. Para la caracterización se utilizó información geo-referencial de puntos de colecta y 13 variables climáticas, geofísicas y edáficas. Se generó un Mapa de Caracterización Eco-geográfica del Terreno Específico (mapa ELC) aplicando la herramienta CAPFITOGEN y estadística descriptiva. Como resultados se identificaron categorías que establecen los rangos adaptativos en el cultivo, con 22 categorías definidas por el mapa ELC y el 39% (73) de las accesiones fueron colectadas en las categorías con rangos de temperatura de 11 ºC a 13 ºC, bajo contenido de materia orgánica, pendiente ligeramente inclinada, suelo franco arenoso, poco profundos y un pH moderadamente ácido. Las variables ambientales para las categorías más frecuentes presentaron valores promedios de temperatura entre 5 - 20 °C, una precipitación que oscila entre 379 - 3764 mm, con un rango de altitud entre los 1800 - 3800 msnm, pendiente de 8 - 9° y un pH de 5,7. Los mapas de caracterización eco-geográfica resultaron de utilidad para identificar zonas adecuadas para el melloco y otros tubérculos andinos en Ecuador, y conocer los rangos eco-geográficos para dicho cultivo. Palabras clave: Adaptación de las plantas; Biodiversidad; Conservación de recursos; Mapa; pH. Abstract The study was carried out in the high Andean region of Ecuador using the National collection of Melloco (Ullucus tuberosus C.), which belongs to the National Germplasm Bank of INIAP. The objective was to evaluate the characteristics of the collection sites, identify climatic ranges and favorable or marginal ecosystems for cultivation. For the characterization, georeferential information of collection points and other climatic, geophysical and edaphic variables were used. An Eco-geographic Characterization Map of the specific Land (ELC map) was generated applying the tool CAPFITOGEN and descriptive statistics. As results, categories that establish the adaptive ranges in the crop were identified, with 22 categories defined by the ELC map. 39% (73) of the accessions were collected in the categories with temperature ranges from 11ºC to 13ºC, low content of organic matter, slope slightly inclined, sandy loam soil, shallow and a pH moderately acidic. The environmental variables for the most frequent categories presented average values of temperature between 5 – 20ºC, a precipitation that oscillates between 379 – 3764 mm, with an altitude range between 1800 – 3800 masl, slope of 8 – 9º and pH of 5.7. The eco – graphical characterization maps were useful to identify suitable areas for melloco and other Andean tubers in Ecuador, and to know the eco – geographic ranges for the studied crop. Keywords: Plant adaptation; Biodiversity; Resources conservation; Maps; pH.

scholarly journals Comparing Beerkan infiltration tests with rainfall simulation experiments for hydraulic characterization of a sandy-loam soil

2017 ◽  
Vol 31 (20) ◽  
pp. 3520-3532 ◽  
Author(s):  
Simone Di Prima ◽  
Vincenzo Bagarello ◽  
Laurent Lassabatere ◽  
Rafael Angulo-Jaramillo ◽  
Inmaculada Bautista ◽  
...  
Keyword(s):  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Rainfall Simulation ◽  
Simulation Experiments ◽  
Loam Soil ◽  
Infiltration Tests

scholarly journals Ecology and distribution of desert Truffles in Algeria.

2021 ◽  
Author(s):  
Zohra Fortas ◽  
Soulef Dib-Bellahouel ◽  
Gérard Chevalier
Keyword(s):  
Molecular Phylogeny ◽  
Calcareous Soil ◽  
Host Plants ◽  
Sandy Loam ◽  
Field Surveys ◽  
Growing Seasons ◽  
Ecological Requirements ◽  
Loam Soil ◽  
Desert Truffles

Abstract This first study focuses on geographical distribution of desert truffles in Algeria, their diversity and their ecological requirements during growing seasons according to field surveys carried out during thirty years (1986–2016). Investigations in 61 productive sites of desert truffles spread over several bioclimatic areas revealed the presence of nine species to genera Terfezia, Tirmania and Picoa and their host plants Helianthemum spp. This study complements our earlier work on characterization of Terfezia and Picoa samples harvested throughout Algeria by macro-and micromorphological studies and by molecular phylogeny. Pedoclimatic factors were evaluated, host plants species were identified and mycorrhizal relationships of these fungi species under field conditions were examined. Results revealed that good natural yield desert truffles species is closely linked to intensity and distribution of rainfall, the temperature, frequency of storms during ascomata growing seasons. Nine desert truffles species grow on sandy loam soil and form with annual or perennial Helianthemum spp. endomycorrhizae on calcareous soil and also ectomycorrhizae without mantle on acidic soil in Helianthemum guttatum..

Emissions of nitrous oxide and nitric oxide associated with the decomposition of arable crop residues on a sandy loam soil in Eastern England

Agronomie ◽  
2002 ◽  
Vol 22 (7-8) ◽  
pp. 731-738 ◽  
Author(s):  
Roland Harrison ◽  
Sharon Ellis ◽  
Roy Cross ◽  
James Harrison Hodgson
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Crop Residues ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Arable Crop ◽  
Loam Soil

Effect of Bio and Organic Fertilizers on Pumpkin's (Cucurbita pepo L.) Leave Content of N, P, and K

2020 ◽  
Vol 10 (1) ◽  
pp. 241-245
Author(s):  
Ammar Hameed Madi ◽  
Jawad A. Kamal Al-Shibani
Keyword(s):  
Cucurbita Pepo ◽  
Sandy Loam ◽  
Block Design ◽  
Organic Fertilizers ◽  
Flowering Stage ◽  
College Of Agriculture ◽  
Significant Difference ◽  
Randomized Complete Block Design ◽  
Loam Soil ◽  
Four Levels

This study was conducted to investigate the effect of bacterial bio-fertilization A. chroococcum and P. putide and four levels of compost (0, 1, 2, 3) tons.h-1 on the leaves content of N.P.K elements. The experiment was carried out in one of the greenhouses of the College of Agriculture - University of Al-Qadisiyah during fall season 2018-2019. It designed in accordance with the Randomized Complete Block Design (RCBD) with three replicates in sandy loam soil. The means of treatments were compared with the least significant difference (LSD) at (5)% probability level. The results present that the treatments of A. chroococcum, P. putide and compost at (3) tons.kg-1 significantly increases the leaves content of K.P.K compared to all other treatments in the flowering stage (4.970, 0.5000, and 4.930) mg.kg-1, respectively. This treatment was followed by the effect of the treatment of A. chroococcum and compost at (3) tons.kg-1, which increases the values of all traits except the leaf content of (P). Bio-fertilizer with P. putide + A. chroococcum significantly increases the leaves' content of P.

INFLUENCE OF UNCONVENTIONAL FERTILIZERS ON MICROBIOLOGICAL ACTIVITY OF SODDY-PODZOLY SANDY SOIL

2020 ◽  
Vol 18 (4) ◽  
pp. 84-87
Author(s):  
Yu.V. Leonova ◽  
◽  
T.A. Spasskaya ◽  
Keyword(s):  
Sewage Sludge ◽  
Sandy Soil ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Microbiological Activity ◽  
Coffee Waste ◽  
Loam Soil

The change in the microbiological activity of sod-podzolic sandy loam soil when using coffee waste and sewage sludge as a fertilizer for oats in comparison with traditional fertilizers is considered. During the study, it was determined that the predominant groups were bacteria and actinomycetes. Bacilli and fungi are few in number. The introduction of sewage sludge and coffee waste into the sod-podzolic sandy loam soil at a dose of 10 t / ha increases the activity of the microflora of the sod-podzolic sandy loam soil, which increases the effective and potential fertility.

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