Coffee Science
URI permanente desta seção${dspace.url}/handle/123456789/3355
Navegar
2 resultados
Resultados da Pesquisa
Item Coffee productive branch growth, development and nutrient accumulation from flowering to harvest under Colombian conditions(Editora UFLA, 2025-05-07) Sadeghian-Khalajabadi, Siavosh; Díaz-Poveda , Vanessa Catalina; Rendón Sáenz, José RaúlIn many Colombian regions, coffee vegetative and reproductive growth (Coffea arabica L.) occurs synchronously; hence, fertilization plans must address both needs simultaneously. The objective of the present study was to evaluate coffee productive branch growth and nutrient accumulation from flowering to harvest. During an event of high concentration of flowering, which occurred in a coffee crop, Castillo Rosario® variety, 35 plants were randomly selected, and two opposite plagiotropic branches of the same cross in the production zone were marked on each plant. One of the branches was detached at full anthesis and the other at harvest. Growth variables and nutrient concentration were measured at each time. Between flowering and harvest, branch length increased by 22 cm, number of nodes by 6.2, total biomass by 33 g, and defoliation from 14.5% to 32.5%. During this period, the concentration of all nutrients in the branch decreased, and the concentrations of N, P, Mg, and B in the leaves were lower. Total nutrient content increased differentially: N 73%, P 76%, K 142%, Ca 40%, Mg 51%, Fe 112%, Mn 87%, Zn 41%, Cu 156%, and B 36%. At anthesis, the highest proportion of nutrients was found in the leaves (57.35%-86.19%), followed by the branch (11.37%-37.41%) and flowers (1.58%-7.38%); at harvest, fruits contained the highest proportion of N, P and K, and leaves the highest contents of Ca, Mg, Fe, Mn, Zn and B. These results reveal the importance of branches and leaves in supporting nutrient demand by fruits and vegetative growth.Item Identification of acid-tolerant coffee genotypes in a coffee germplasm collection of Colombia(Editora UFLA, 2020) Acuña-Zornosa, Ricardo; Sadeghian-Khalajabadi, SiavoshOne of the limitations of coffee production in many regions of Colombia is the soil acidity. According to historical soil chemical analysis records, more than 50% of coffee farms have pH values below 5.0. Because acid-tolerant coffee varieties are not available, farmers use calcareous additives to correct the problem, which incurs associated labor and input costs. The objective of this work was to identify acid-tolerant genotypes of Coffea arabica. For two contrasting soils in the coffee-growing area of Colombia (Andisol and Entisol), the effect of soil acidity on the growth of 20 genotypes of Coffea Arabica during the seedling stage was evaluated. The genotypes were wild accessions that make up the Colombian Coffee Germplasm Collection and the Castillo ® Naranjal Variety, used as commercial material. Six months after the seedlings were transplanted into soils treated with or without acidity correction additives, the weight of the dry matter of the roots, stems and leaves was recorded. Later, the acid-tolerant genotypes were identified by means of the quadrant method and the tolerance index. The Timor Hybrid and Rume Sudan genotypes were identified as tolerant of the acidity of the two soil types. These genotypes could be used as progenitors in a coffee breeding program leading to a commercial coffee variety tolerant to soil acidity.