10.6084/m9.figshare.5734197.v1 Douglas Antonio Rogeri Douglas Antonio Rogeri Leandro Bortolon Leandro Bortolon Clesio Gianello Clesio Gianello Magno Batista Amorim Magno Batista Amorim Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul SciELO journals 2017 clay content phosphate buffer capacity phosphate fertilization phosphorus adsorption soil test 2017-12-27 02:40:25 Dataset https://scielo.figshare.com/articles/dataset/Remaining_phosphorus_content_to_determine_phosphorus_availability_of_the_soils_in_Rio_Grande_do_Sul/5734197 <div><p>Abstract: The objective of this work was to evaluate remaining P compared with soil clay content as a P buffer index to classify P extracted by the Mehlich-1 (M1) and Mehlich-3 (M3) methods in soils from the state of Rio Grande do Sul, Brazil. The experiment was carried out in a completely randomized design with five P2O5 rates (0, 50, 100, 200, and 400 mg kg-1) and two sucessive corn crops, and three replicates, in 20 representative soils of the state. P extracted by M1 and M3 before crop planting was adjusted to P contents in biomass, considering soil buffer capacity. The division of soils into different buffering classes, based on soil clay or remaining P, improved the capacity of estimating soil available P of both methods. However, there was no difference among the correlation coefficients obtained by classifying soils according to the evaluated indexes (remaining P or soil clay) for both M1 and M3 methods. Remaining P is a viable alternative to replace soil clay content to classify soil P extracted with the M1 and M3 methods.</p></div>