Long-term effects of lime and phosphogypsum on soil carbon and nitrogen and physical attributes under tropical no-till

Author(s)

da Costa, Claudio Hideo Martins ^[1] ; Wander, Michelle M. ^[2] ; Crusciol, Carlos Alexandre Costa ^[3] ; Ugarte, Carmen ^[2] ; Rigon, Joao Paulo Gonsiorkiewicz ^[3] ; Soratto, Rogerio Peres ^[3] ; Calonego, Juliano Carlos ^[3]

Affiliation

^[1] Fed Univ Goias UFG, Jatai, State Goias - Brazil

^[2] Univ Illinois, Dept Nat Resources & Environm Sci, Urbana, IL 61801 - USA

^[3] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Crop Sci, Botucatu, SP - Brazil

• Document type: Journal article
• Source: Soil Science Society of America Journal; v. 85, n. 2 MAR 2021.
• Web of Science Citations: 0

Abstract

Lime and phosphogypsum applications are well-established practices in weathered soils, and their surface application under no-till (NT) can affect soil physical attributes and C and N fractions. This study determined the long-term (10-yr) effects of lime and phosphogypsum applications to the soil surface on soil C and N fractions of a tropical NT field. The experimental design was a randomized block with four treatments and four replications. The following treatments were applied in October 2002, November 2004, and October 2010, respectively: limestone (2,000 kg ha(-1)), phosphogypsum (2,100 kg ha(-1)), and limestone (2,000 kg ha(-1)) plus phosphogypsum (2,100 kg ha(-1)). In general, after 10 yr of liming, both alone and when associated with phosphogypsum, the cumulative crop straw inputs were increased at least 20% across the years, and the C fractions increased remarkably at different soil depths. Both treatments improved the SOC stocks by 24% (12.5-15.6 Mg ha(-1)) at 0.1-0.2-m soil depths and by 10% (30.6-33.8 Mg ha(-1)) at 0-0.2-m soil depths, and in general the soil aggregation at 0-0.4-m soil depths. However, the particulate C and N fractions were reduced at 0-0.05-m soil depth, suggesting a slight response to the transitory trend of soil organic C (SOC) depletion. Liming, both alone and when associated with phosphogypsum, overcame the transitory C pool depletion and improved soil aggregation, soil C fractions, and SOC stocks and could be considered an important factor that drives the sustainability of cropping systems under NT. (AU)

• FAPESP's process: 13/03683-1 - Soil chemical modifications and organic matter as affected by lime and phosphogypsum surface application in the succession corn / crambe / cowpea under no tillage system
• Grantee: Carlos Alexandre Costa Crusciol
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/10493-9 - SOIL CHEMICAL MODIFICATIONS AND ORGANIC MATTER AS AFFECTED BY LIME AND PHOSPHOGYPSUM SURFACE APPLICATION IN THE SUCCESSION CORN/CRAMBE/COWPEA UNDER NO TILLAGE SYSTEM
• Grantee: Claudio Hideo Martins da Costa
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/06733-0 - Organic matter as affected by lime and phosphogypsum surface application in the succession corn/crambe/cowpea under no-tillage system
• Grantee: Claudio Hideo Martins da Costa
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate