Feliciano-Justiniano, Emmanuel

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    Searching for the best methodology to determine lime requirement of selected Puerto Rican soils
    (2010) Feliciano-Justiniano, Emmanuel; Muñoz, Miguel A.; College of Agricultural Sciences; O’Hallorans, Julia M.; Snyder, Victor; Department of Crops and Agro-Environmental Sciences; Maldonado, Sandra L.
    The accuracy of six methods to estimate lime requirement was evaluated using ten acid soil series from Puerto Rico. The methods selected for the research were soil-lime incubation, buffer solutions (Shoemaker-McLean-Pratt, Sikora, Adams-Evans and Mehlich) and an estimate based on exchangeable Al3+ content. Soil samples of Consumo (Typic Haplohumults), Corozal (Typic Hapludults), Lares (Aquic Paleudults), Humatas (Typic Haplohumults), Catalina (Typic Hapludox), Los Guineos (Humic Hapludox), Bayamón (Typic Hapludox), Dagüey (Inceptic Hapludox), Alonso (Oxic Dystrudepts) and Múcara (Dystric Eutrudepts) series were collected at two depths (0-20 cm and 20-40 cm). Lime requirement values were estimated using a target pH of 6.5. The soil-lime incubation was the reference method to perform the statistical analysis. The soil-lime incubation method showed lime requirement values ranging from 3.94 to 38.88 Mg ha-1 . Adams-Evans buffer showed lime requirement values varying from 3.60 to 12 Mg ha-1 . Mehlich buffer recommended lime in a range from 1.70 to 25.80 Mg ha-1 . Exchangeable Al3+ method showed lime requirement values ranging from 0.22 to 16.57 Mg ha-1 . SMP buffer showed lime requirement estimates varying from 5.60 to 41.60 Mg ha-1 . Sikora buffer showed lime requirement values ranging from 4.70 to 41.66 Mg ha-1 . Adams-Evans buffer, Mehlich buffer and exchangeable Al3+ methods provided lower lime requirement values than soil-lime incubation method for all soils. The highest lime requirement values were obtained with the SMP and Sikora buffers. Both of these methods gave similar lime requirement values. Pearson correlation coefficients indicated a good correlation between soil-lime incubation method and the SMP (0.88) and Sikora (0.85) buffer methods. Both methods also showed good linear relation with soil-lime incubation method. Sikora buffer seems to be the best alternative to estimate lime requirement of the soils included in this research due to its notable advantages.