Matos Rodríguez, Manuel

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    PublicationOpen Access
    Assessment of Two Sweet Orange Cultivars Grafted on Selected Rootstocks Grown on an Inceptisol in Puerto Rico
    (Horticulturae, 2020-05-18) Tirado Corbalá, Rebecca; Segarra Carmona, Alejandro E.; Rivera Ocasio, Dania; Estévez de Jensen, Consuelo; Pagán, Jeniffer; Matos Rodríguez, Manuel; University of Puerto Rico at Mayaguez; College of Agricultural Sciences; Department of Crops and Agro-Environmental Sciences
    Sweet oranges in Puerto Rico and other citrus-producing areas in the world have been greatly affected by the Huanglongbing disease (HLB). Historically, most of Puerto Rico’s citrus production has been located from 0–600 m above sea level, where fruit acquire a desirable color and flavor due to climatic conditions. However, higher populations of the disease vector Diaphorina citri Kuwayama have been reported at these elevations in Puerto Rico. Although only 6.4% of the land area is located above 600 m, it is composed mainly of environmentally sensitive or non-arable land where Inceptisols are the dominant soil order. For that reason, ‘Marr’s Early’ and ‘Pera’ sweet orange (Citrus sinensis) scions grafted on ‘Carrizo’, ‘HRS 802’, and ‘HRS 812’ rootstocks were planted in Alonso clay series Inceptisol (Oxic Humudepts) at 649 m in 2010. Tree growth parameters (height, diameter, canopy volume) and yield efficiency were measured. Fruit quality was determined from juice content (%), total soluble solids [°Brix], and pH. Leaf tissue analyses showed an optimum range for Ca, Mg, Na, P, B, Cu, and Zn, an indicator of tree health. A few were high (i.e., N and P) or in excess (i.e., Fe), but no clear connection to specific scions or rootstocks could be established. Tree height, tree diameter, fruit production, and juice content were higher in both sweet oranges grafted on ‘HRS 802’ compared with those on ‘HRS 812’ and ‘Carrizo’. Therefore, ‘HRS 802’ rootstock can be recommended to local farmers growing sweet oranges in Alonso series soil.
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    PublicationOpen Access
    Taxonomic classification of the soils of Puerto Rico, 2017
    (2018-01) Lugo Marty, Wanda I.; Santiago Lugo, Carmen; Matos Rodríguez, Manuel; Ríos Vila, Samuel A.; Lugo Camacho, Jorge L.; Muñoz Muñoz, Miguel A.; College of Agricultural Sciences; Agricultural Experimental Station
    The ecological diversity of Puerto Rico is reflected in the diversity of its soils. Ten of the 12 soil orders established by Soil Taxonomy, the official system of soil classification of the United States National Cooperative Soil Survey, are present in Puerto Rico. This report updates a previous publication on the taxonomic classification of the soils of Puerto Rico. It incorporates new categories of soils not recognized at the time of the previous publication, including Aridisols and soils with perudic moisture regimes. Several new soil series have been identified, and others have been eliminated or renamed responding to new data that has become available. The current revised publication is presented in a similar format as the previous one, incorporating tables that are easy to follow, and which conform to different user needs. The Spanish meaning of formative elements for orders and suborders was added to this publication, complementing the English counterpart. A new section has been added containing photos of soil profiles and associated landscapes representing the different soil orders on the Island, providing users with a vivid and appealing view of the diversity of Puerto Rican soils. Two maps of soil orders are included, one representing a previous (1960-1982) classification and another representing the current classification. The new map incorporates recently recognized Aridisols and new Oxisols, which were formerly mapped as Ultisols. The Aridisols in the current map are restricted to the southwest part of the Island, but it is believed that other Aridisol pockets may exist along the south coastal zone. Soil Taxonomy is a dynamic system, constantly in revision to incorporate new knowledge stemming from field and laboratory research. Thus, future revisions are expected to emerge down the road.