Work

Lime and phosphogypsum application and sulfate retention in subtropical soils under no-till system

Year: 2013

Type: article

Abstract: This study reports long-and medium-term effects of the application of up to 12 Mg ha -1 of phosphogypsum (PG) as soil conditioner and source of Ca and S, in two field trials, conducted under no-till systems.One field trial was located in Ponta Grossa, state of Paraná (PR), Brazil, on a loamy Oxisol, which received lime and PG applications in 1993.Another area of study was located in Guarapuava (PR), on a clayey Oxisol,which received PG in 2005.After thirteen years of surface-applied lime on the loamy Oxisol, we observed soil acidity reduction up to 80 cm depth, while PG effects Ca 2+ and S-SO 4 2contents were more pronounced at deeper soil layers.Sulfate distribution in soil profiles was mostly correlated with Fe d and Fe d -Fe o .However, there was no long-term effect of lime and PG additions on no-till maize (Zea mays) and wheat (Triticum aestivum) yields.An appreciable movement of SO 4 2--S to the subsoil was observed in soil samples from the clayey Oxisol after surface-applied PG.This was observed even in the medium term (3.5 years) and despite the higher adsorption capacity of sulfate.In this case, PG addition had positive benefits on maize and triticale (X Triticosecale) yields due to the supply of Ca 2+ and SO 4 -2 -S to the plants.

Source: Journal of soil science and plant nutrition

DOI: 10.4067/s0718-95162013005000024

Authors: S Churka Blum, E. F Caires, L. R. F Alleoni

Institutions: Universidade de São Paulo, Universidade Estadual de Ponta Grossa

Language: English

Topic: Soil Management and Crop Yield

Subfield: Soil Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDGs: Zero hunger, Life on land

Open Access status: hybrid

Estimated APC paid: $3,190