Journal of Agriculture- University of Puerto Rico Impact Factor & Information

Publisher: University of Puerto Rico (Río Piedras Campus). Agricultural Experiment Station

Journal description

Current impact factor: 0.00

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2011 Impact Factor 0
2010 Impact Factor 0.023
2009 Impact Factor 0.077
2008 Impact Factor 0.204
2007 Impact Factor 0.037
2006 Impact Factor 0.047
2005 Impact Factor 0.028
2004 Impact Factor 0.116
2003 Impact Factor 0.156
2002 Impact Factor 0.044
2001 Impact Factor 0.083
2000 Impact Factor 0.041
1999 Impact Factor 0.089
1998 Impact Factor 0.085
1997 Impact Factor 0.04
1996 Impact Factor 0.098
1995 Impact Factor 0.04
1994 Impact Factor 0.022
1993 Impact Factor 0.011
1992 Impact Factor 0.047

Impact factor over time

Impact factor

Additional details

5-year impact 0.07
Cited half-life >10.0
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.03
Other titles The Journal of agriculture of the University of Puerto Rico, Journal of agriculture of University of Puerto Rico
ISSN 0041-994X
OCLC 2449950
Material type Government publication, Periodical, State or province government publication
Document type Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Soils are being degraded around the world as a consequence of climate change, intensive cropping and inappropriate land management. These actions cause soil erosion and topsoil depletion. Eroded and bare soil is exposed to environmental pressures, which can increase its organic matter loss via CO2 release. The use of compost provides organic matter that can associate with clays acting as a cementing agent forming soil aggregates and preserving good chemical and physical soil qualities that can avoid soil degradation. The quality of soils is reduced as soil organic carbon decreases leading to decreasing crop yields. Depletion of soil organic matter impairs soil physical, chemical and biological properties. Organic matter buffers soil pH in some tropical soils. Organic matter has a buffering capacity. Acid soils tend to increase its pH, while alkaline soils tend to decrease it. The buffering effect is greater when the organic matter has a high concentration of humic acids. Soil exposure to environmental pressures can render nutrient deprived soils. When soils are weatherized hydrogen ions replace the exchangeable cations, Ca, Mg, K, Na, in its CEC hence decreasing the pH of the soil. Lower pH may increase the soils capacity to fix P into an unavailable form and cause aluminum toxicity, along changing physical qualities such as increasing low porosity and bulk density. A 2% SOC has been suggested as minimum level for proper soil-environmental and -agronomic conditions. At 0 to 30-cm depth, some Puerto Rican soils have less than 7.2 kg C/m2, equivalent to 2% SOC when soil bulk density is 1.2 Mg/ha. The reduction of soil organic matter could impede agricultural activity.
    Journal of Agriculture- University of Puerto Rico 12/2013; 97(1).
  • Journal of Agriculture- University of Puerto Rico 12/2013; 92(3-4):117-132.
  • Journal of Agriculture- University of Puerto Rico 01/2013; 97(3-4):107-117.
  • [Show abstract] [Hide abstract]
    ABSTRACT: The Jobos Bay National Estuary Research Reserve (JBNERR) in Salinas, Puerto Rico, serves as sink for many anthropogenic substances that may affect the quality of the soil and water and the integrity of the biota. Six transects were established in the southeast part of JBNERR for interstitial water collection. In addition, soil samples were collected along transect II, which was affected by runoff from a road closer to the Salinas landfill. The concentration of lead (Pb) in interstitial water from the above mentioned transects ranged between 0.07 and 0.68 mg/L; chromium (Cr) concentration ranged between 0.03 and 0.24 mg/L; and manganese (Mn) concentration ranged between 0.35 and 15.25 mg/L. The total Pb in soil samples ranged between 57 and 776 μg/g in an uneven distribution along transect II. The low Pb concentrations in water in comparison to that in soil indicate the high capacity of the JBNERR soils to serve as sink for heavy metals. The linear correlation between Pb concentrations in the interstitial water and the electrical conductivity indicates that marine water intrusion increases Pb dissolution from soils. Also detected in interstitial water were anthropogenic organic compounds such as benzothiazole, 1-methyl-2-pyrrolidinone and tert-butyl phenol; however no residues of agricultural pesticides used in nearby farms were found. Results have shown that human activities have affected soil and water quality in the JBNERR.
    Journal of Agriculture- University of Puerto Rico 01/2012; 96(1-2):23-25.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Alternaria isolates were collected from onion foliage at different stages of the plant life cycle. Incidence of Alternaria species in cultivars 'Mercedes' and 'Excalibur' was determined during two consecutive growing seasons in fields located In southern Puerto Rico. Leaves showing purple to brown sunken elliptical lesions with chlorotic halos were taken at random. Five leaf sections (0.5 cm) from each sample were superficially disinfested, transferred to culture media and incubated, and Isolations were documented. Disease incidence ranged from 25 to 52% in 60- to 100-day-old plants. An increase in Alternaria incidence was observed in response to high relative humidity in the fields. A total of 280 isolates were obtained, and 35 were selected for morphological, pathogenic and molecular characterization. A complex of five different Alternarla species is associated with onion leaf blight on the island. Alternaria destruens, A. tenuissima, A. palandul, A. allii and a group of small-spore Alternaria sp., belonging to a taxonomlcally undescribed group, were identified. Sixty-two percent of selected isolates belong to this group having an A. arborescens intermediate sporulation pattern. Alternaria destruens and A. palandui have not been previously reported as associated with onions in the Caribbean or in the Western Hemisphere. Pathogenicity tests showed that A. allii, A. tenuissima and Alternaria sp. were pathogenic to onion foliage, with A. allii as the most virulent. Molecular characteristics of the isolates were determined by using the ITS of the rDNA gene. Phylogenetic relationships based on rDNA ITS sequences from Alternaria isolates and other Pleosporaceae distinguished three clades. The first clade of large filiform-beaked spores included A. allii from this study, as well as isolates from the GenBank (A. porri, A. solani, A. macrospora, A. zinniae and A. sesamicola). These formed a monophyletic group, discrete from other members of the genus. The second clade included a diverse group of smallspore Alternaria: A. tenuissima, A. alternata, A. palandui, A. destruens and Alternaria sp.; the third clade included Stemphylium spp.
    Journal of Agriculture- University of Puerto Rico 01/2011; 95(1):57-78.
  • [Show abstract] [Hide abstract]
    ABSTRACT: A sooty mold disease on longan (Dimocarpus longan L.) was found on trees growing close to bodies of water in Puerto Rico. On the basis of the morphological characters the fungi associated with this disease were identified as Tripospermum porosporiferum Matsushima and T. variabile Matsushima. T. porosporiferum produced hyaline to pale brown tri or tetraradiate conidia. Conidia (40 x 6.6 µm) have four septate appendages, with a shorter two-celled axis 16 µm long. Conidia are constricted at septa. T. variabile produced pale brown, triradiate (T-shape) conidia (36 x 6.6 µm) with main axis not bent back. Conidia are constricted at septa and the shorter part of axis which is 6.39 µm long. Both organisms have been reported in Puerto Rico in decaying vegetation in bodies of water. Studies will be initiated to assess the impact of these fungi on production of trees cultivated near bodies of water where these fungi are most commonly found
    Journal of Agriculture- University of Puerto Rico 01/2010; 94(2-4):285-287.
  • Journal of Agriculture- University of Puerto Rico 01/2008; 92:235-239.